Postscript

Name: Postscript
Brand: Postscript
Price: 049100 USD

SMS built for Shopify and nothing else

Postscript is an SMS and MMS marketing platform built exclusively for Shopify merchants, combining subscriber collection tools (onsite popups, checkout opt-in, keywords, QR codes), a drag-and-drop flow builder with more than 65 ecommerce triggers, Shopify-native segmentation, revenue attribution reporting, and an AI conversational sales agent called Shopper; it sells on a published four-tier plan structure where the monthly platform fee buys a lower per-message rate and carrier fees are passed through on top.

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Overview

Postscript was founded in 2018 by Adam Turner and Alex Beller on a bet that the Shopify ecosystem was large enough to support a messaging platform that did nothing else. That focus is the whole product argument. Because Postscript only has to speak one commerce data model, its segments read Shopify order history, line items, discount codes, subscription state, and browse behavior natively, without the field-mapping layer that general-purpose SMS tools require before they can do anything useful with ecommerce data.

The company has raised roughly $138M, including a $65M Series C in June 2022 led by 01 Advisors with participation from Twilio Ventures, Greylock, Accomplice, Elephant, and OpenView. Headcount sits somewhere around 280 to 310 depending on which data provider you believe, headquartered in Scottsdale, Arizona, and in early 2026 the founders moved to a co-CEO structure with Beller on the core business and Turner on AI. That AI investment is visible in the product: Brand Center trains the system on your voice, AI Infinity Testing generates and scores thousands of message variants against revenue, and Shopper is a two-way conversational agent that tries to turn the SMS channel into something closer to a salesperson than a broadcast list.

The commercial structure is worth understanding before you sign up, because Postscript prices differently from the seat-and-credit tools that dominate the rest of this category. There is no per-user fee and no credit bundle. You pay a monthly platform fee (from $0 on Starter with a $49 minimum spend, up to $500 on Professional) and that fee buys you a lower per-message rate, plus carrier pass-through fees on top of every send. On Starter, SMS runs about $0.015 and falls toward $0.009 with volume; Professional lands at roughly $0.007 SMS and $0.024 MMS. The break-even math is arithmetic you can do on paper before you commit.

Compliance is treated as a product surface rather than a legal disclaimer. Postscript maintains an in-house compliance and legal team, hard-wires quiet hours by recipient time zone, manages consent capture through its own opt-in tooling, and handles A2P 10DLC and toll-free verification as part of onboarding. Given that TCPA class actions are the actual downside risk in SMS marketing, the fact that a vendor treats quiet hours as a default rather than a setting you might find is a substantive difference, not a marketing line.

Best for

Shopify and Shopify Plus merchants doing enough revenue that a dedicated SMS channel earns its keep, particularly stores with repeat purchase behavior, subscriptions on Recharge, or a Klaviyo email program already running that they want SMS to sit alongside rather than replace.

Not the right fit for

Anyone not on Shopify. Postscript is a Shopify app and there is no WooCommerce, BigCommerce, Magento, or headless path, so a merchant on any other cart is simply not a customer.
Service businesses, clinics, agencies, and local operators who want two-way texting with clients; the entire data model assumes orders and products exist, and a business without a cart gets no value from the parts that justify the price.
Sub-scale stores. The $49 minimum spend on Starter and per-message pricing means a store sending a few hundred texts a month is paying platform overhead for a tool designed to run six-figure campaigns.
Buyers who want one vendor for email and SMS. Postscript does not send email, so you are running it next to Klaviyo, Kit, or similar and reconciling attribution across two systems.
International-first merchants. Postscript is built around US carrier infrastructure, A2P 10DLC, and US compliance rules, and is not the tool to pick if the majority of your list sits outside North America.

How it works

1
You install Postscript from the Shopify App Store and authorize it against your store. There is no data-mapping exercise because the platform reads Shopify objects directly: customers, orders, line items, products, discounts, and checkout events all arrive as native fields you can segment and trigger on.
2
Next you turn on subscriber collection. Desktop and mobile popups, checkout collection on Shopify and Shopify Plus, standalone landing pages, text-to-join keywords, and QR codes each capture consent in a form designed to satisfy TCPA and CTIA requirements, with the consent record stored against the subscriber. Postscript also runs an Onsite Opt-in Network that recognizes visitors already known across its subscriber base, which materially raises opt-in rates on a cold store.
3
Before you can send, you register for A2P 10DLC or verify a toll-free number. Postscript walks you through brand and campaign registration and includes a toll-free number free with verification; a dedicated short code is available at $750 per month at carrier cost with no vendor markup, which matters if you are sending at volumes where throughput is the constraint.
4
Day to day you build campaigns and automations in a drag-and-drop flow builder with branching logic and more than 65 trigger events, including keyword replies, checkout started, order created, order in transit, and product views. Segments draw on more than 45 filters, trigger filters on more than 85. Replies land in a Responses inbox where a machine learning layer sorts conversations by sentiment and topic, and can be forwarded to Gorgias, Zendesk, or Slack so your support team handles support rather than your marketer doing it badly.
5
Reporting closes the loop with revenue attribution on a default 7-day click and 24-hour view window, both adjustable, with UTM parameters you control and a custom short-link subdomain. Professional adds API access and removes the Postscript branding from messages.

Feature breakdown

32 features in 6 modules

Subscriber collection

The list-growth layer, which is where SMS programs live or die.

Desktop and mobile popups: Customizable onsite opt-in units with incentive selection, designed so the consent language and double opt-in flow satisfy TCPA and CTIA requirements rather than leaving that to you.
Onsite Opt-in Network: Recognizes visitors already known across Postscript's subscriber base (the vendor cites more than 130 million) so returning shoppers can opt in with one tap instead of typing a number.
Checkout collection: SMS consent captured at checkout on Shopify, Shopify Plus, Recharge, CartHook, and custom checkouts, which is the highest-intent moment on the site.
Landing pages and forms: Standalone opt-in pages you can link from email, paid social, or a bio link, so list growth is not confined to onsite traffic.
Keywords and QR codes: Text-to-join keywords with per-source attribution and generated QR codes for packaging inserts, retail signage, and print.
Back in stock: Captures high-intent subscribers on out-of-stock product pages and notifies them on restock, which is usually the single highest-converting automation a store runs.

Campaigns and automation

The flow builder and the ecommerce triggers it fires on.

Drag-and-drop flow builder: Visual builder with branching logic, delays, and conditional splits, used for both one-off campaigns and evergreen automations rather than two separate tools.
More than 65 automation triggers: Includes keyword reply, checkout started, order created, order in transit, product viewed, and subscription events, all read natively from Shopify without custom event plumbing.
Abandoned checkout and browse recovery: The standard revenue workhorses, built on native Shopify checkout and browse events rather than a pixel you have to install and babysit.
Campaign scheduling and send windows: Flash sales, holiday promotions, and educational sequences scheduled against recipient time zones.
MMS campaigns: Image, GIF, and video sends priced separately (roughly $0.045 on Starter down to $0.024 on Professional), which is a real cost decision rather than a free upgrade.
Coupon controls: Discount codes generated with minimum spend, eligible product restrictions, and per-customer usage limits so the promotion cannot be scraped and resold.

Segmentation and AI

Where the Shopify-only focus pays for itself.

More than 45 segment filters: Shopify order data, SMS engagement history, location, purchase history, and connected app data combine into segments without any field mapping step.
More than 85 trigger filters: Order-level personalization on line items, subtotal, discounts applied, and product attributes, so a message can reference what the customer actually bought.
Brand Center: Trains the AI on your brand voice with human review checkpoints, so generated copy sounds like the store rather than like a generic promotional text.
AI Infinity Testing: Generates and evaluates thousands of message variants optimizing for revenue rather than click rate; the vendor claims an average 20 percent revenue lift, which should be treated as a vendor number.
Shopper AI agent: A customizable two-way conversational shopping assistant that answers product questions and can carry a sale through SMS, with an Ask Shopper analytics layer that surfaces patterns across those conversations.

Two-way messaging and support routing

What happens when subscribers text back, which they will.

Responses inbox with ML triage: Incoming messages are classified by sentiment (positive, negative, neutral) and topic (questions, shipping, returns) so a marketer is not reading every reply to find the three that matter.
Help desk forwarding: Routes conversations into Gorgias, Zendesk, or Slack so replies are handled by the team that already handles customer support tickets.
Automatic opt-out handling: STOP, UNSUBSCRIBE, and equivalent keywords are processed automatically and the subscriber is suppressed across every campaign and flow.
Custom contact card: A branded vCard the subscriber can save, so your number shows as the store name in their messages app instead of an unknown ten-digit string.

Compliance and deliverability

The part that keeps you out of a TCPA class action.

Quiet hours by time zone: Sends are gated to permissible hours in the recipient's local time zone by default rather than by an opt-in setting, which is the single most common source of TCPA exposure.
In-house compliance and legal team: Postscript employs compliance staff who track TCPA, CTIA, and carrier rule changes and push platform-level updates rather than publishing a blog post and wishing you luck.
A2P 10DLC and toll-free registration: Brand and campaign registration handled as part of onboarding; a verified toll-free number is included at no extra charge on every plan.
Dedicated short code: Available at $750 per month passed through at carrier cost with no vendor markup, for merchants who need the throughput and the trust signal.
Carrier relationships and throughput: Direct carrier partnerships plus a Twilio relationship the vendor describes as providing roughly triple bandwidth, with pre-paid capacity and redundancy for Black Friday-scale spikes.
Consent record keeping: Opt-in source, timestamp, and language are stored per subscriber, which is the evidence you need if a consent challenge ever arrives.

Reporting and developer surface

Attribution you can argue with, plus the API on the top tier.

Revenue attribution: Default 7-day click and 24-hour view attribution windows, both adjustable, so you can align the SMS numbers with whatever window your email tool uses instead of double-counting.
In-flow message performance: Compares message-level performance inside an automation, not just flow-level totals, so you can see which step is dead weight.
UTM and short-link control: Global and per-message UTM parameters plus a custom short-link subdomain, which improves click-through and keeps the traffic attributable in Google Analytics.
API access: Available on the Professional tier and above for custom integrations, data export, and event ingestion.
Branding removal: The Powered by Postscript footer is removed on Professional, which is a real consideration for a premium brand.

Use cases

4 documented

Shopify apparel brand running a Black Friday calendar

Email open rates are falling, the promotional calendar is eleven sends in five days, and the store needs a channel that reaches people in the hour the sale actually runs.

Popup and checkout collection build the list ahead of the season, quiet hours keep the sends legal across time zones, pre-paid carrier bandwidth absorbs the spike, and revenue attribution separates SMS-driven orders from the email program running alongside.

Subscription supplement store on Recharge

Churn shows up as a skipped or cancelled subscription, and by the time the email lands the customer has already moved on.

Subscription events trigger SMS flows at the decision moment, two-way replies route to Gorgias so a human can save the account, and win-back segments target lapsed subscribers with order-history-aware copy.

Store with chronic stockouts on hero products

The best-selling SKU sells out repeatedly and the demand disappears into a product page nobody returns to.

Back-in-stock capture on the out-of-stock page collects high-intent subscribers, restock notifications go out within minutes, and the automation quietly becomes the highest revenue-per-send flow in the account.

Merchant testing conversational commerce

Broadcast SMS revenue has plateaued and each additional send is measurably degrading list health and opt-out rate.

The Shopper AI agent handles product questions and objections in two-way conversation, Ask Shopper analytics surface the recurring blockers across those threads, and the merchant learns why people are not buying rather than just sending more discounts.

Pricing

from $0 per month on Starter with a $49 minimum spend, then $100 per month on Growth

Monthly platform fee that buys a lower per-message rate, plus usage. Carrier pass-through fees apply on top of every message on every tier. No per-seat charge and no credit bundles.

Plan	Price	Includes
Starter	$0 per month plus a $49 minimum spend	SMS from about $0.015 falling toward $0.009 with volume MMS about $0.045 Campaigns, automations, and unlimited segments Toll-free number included with verification Two opt-in keywords Carrier fees are charged on top. The $49 floor means the true minimum cost of running Postscript is $49 a month.
Growth	$100 per month plus usage	SMS from about $0.01 falling toward $0.008 MMS about $0.03 Unlimited opt-in keywords Live chat support Everything in Starter The break-even against Starter arrives somewhere around 20,000 SMS a month; below that the platform fee is not paying for itself.
Professional	$500 per month plus usage	SMS about $0.007 and MMS about $0.024 API access Enhanced analytics Priority support and a dedicated customer success manager Powered by Postscript branding removed Marked as the most popular tier. API access sitting behind a $500 fee is the notable gate here.
Enterprise	Custom quoted	Dedicated onboarding specialist Personalized one-to-one messaging services Data warehouse push Priority support The only tier that requires a sales conversation; everything below it is self-serve.

Add-ons

Dedicated short code ($750 per month): Passed through at carrier cost with no Postscript markup. Provisioning typically takes eight to twelve weeks.
Toll-free number (Included): Free with verification on every plan, which is how most merchants start.
Carrier pass-through fees (Roughly $0.003 per SMS segment and $0.004 to $0.01 per MMS): Charged by AT&T, T-Mobile, and Verizon on A2P traffic and billed on top of the Postscript per-message rate on every tier.

Billing notes

Carrier fees are additive on every plan including Starter, so your real cost per SMS segment is the Postscript rate plus roughly $0.003. Budget accordingly rather than quoting the headline rate internally.
Segments are the unit that gets billed, not messages. A plain-text message runs to 160 characters per segment, but any emoji or special character forces the whole message into unicode encoding at 70 characters per segment, which can triple the cost of a single send without you noticing.
There are no message credits and therefore nothing to roll over. You pay for what you send, which is friendlier than credit bundles that expire but removes the ability to pre-buy at a discount.
Monthly billing is standard and no contract is required; annual contracts exist only through the sales team.
The $49 minimum spend on Starter is the real floor. A store sending under about 3,000 texts a month is paying for capacity it is not using.
The $100 trial credit expires after 30 days and covers both message and carrier fees, which is an honest structure since carrier fees are the part most trials quietly exclude.

Value assessment: Postscript is priced for stores where SMS is a real revenue line, not an experiment. On Growth at $100 plus roughly $0.013 all-in per SMS segment, a 25,000-message month costs about $425, which is defensible if attribution shows the channel returning multiples of that and indefensible if it does not. The genuinely good part of the structure is that the platform fee buys a rate reduction rather than a feature unlock, so the decision is arithmetic rather than a negotiation. The bad part is API access sitting behind the $500 Professional tier, which is a strange gate for a platform whose whole pitch is data-native integration. Against general-purpose texting tools charging per credit, Postscript looks expensive at low volume and clearly cheaper at high volume, which is exactly what you would expect from a platform built for stores that send a lot.

Strengths & limitations

Strengths

Shopify-native data model means segments and triggers read order history, line items, discounts, and subscription state directly, with no field mapping and no sync lag to debug.
Compliance is a product feature rather than a disclaimer: quiet hours by recipient time zone are the default, an in-house legal team tracks rule changes, and consent records are stored per subscriber with source and timestamp.
Subscriber collection is unusually deep, and the Onsite Opt-in Network genuinely lifts opt-in rates on stores with no existing list because it recognizes shoppers already in Postscript's base.
Pricing tiers buy a lower per-message rate rather than gating features, so the cost model is transparent arithmetic you can run before signing up.
Carrier relationships and pre-paid bandwidth are a real operational asset during Black Friday-scale sends, where throughput is the binding constraint rather than software.
The AI layer is more than a copy generator: Infinity Testing optimizes variants against revenue and Shopper turns the channel two-way, which is the most credible answer anyone in this category has to broadcast fatigue.
Well capitalized at roughly $138M raised, with Twilio Ventures on the cap table and a headcount near 300, so vendor risk is low by the standards of this category.

Limitations

Shopify only. There is no path for WooCommerce, BigCommerce, Magento, or headless commerce, and replatforming means replacing Postscript.
No email channel, so you run it beside Klaviyo, Kit, or similar and reconcile attribution across two systems with different windows.
API access is gated to the $500 Professional tier, which pushes developer-led merchants into a price bracket they may not otherwise need.
The $49 minimum spend on Starter means the entry price is not actually zero, and the platform-fee tiers only pay for themselves at meaningful volume.
Built around US carrier infrastructure and A2P 10DLC; international coverage is not the pitch and merchants with a mostly non-US list should look elsewhere.
Revenue attribution is self-reported by the vendor's own windows. The defaults are reasonable but any platform grading its own homework should be cross-checked against your analytics rather than quoted to the board.
The company repositioned around AI in 2026 with a co-CEO split. Shopper and Infinity Testing are new enough that the vendor's percentage claims should be treated as claims until your own account produces numbers.

Head-to-head comparisons

3 alternatives

Postscript vs Emotive

from $100 per month plus $0.015 per SMS on Starter

Both are ecommerce SMS platforms with published self-serve pricing and both lean on two-way conversation rather than pure broadcast. Postscript is Shopify-only with far deeper native segmentation and a much larger engineering organization behind it; Emotive supports Shopify, WooCommerce, BigCommerce, and Magento and bundles human copywriting help through its TextPros service. Choose Postscript if you are on Shopify and want the deepest data integration in the category. Choose Emotive if you are on another cart or you want a vendor that will write the messages for you.

Full Postscript vs Emotive comparison

Postscript vs SimpleTexting

from $39 per month for 500 credits, or $398.40 per year with annual billing

SimpleTexting is a general business texting platform with credit-based plans from $39 a month, a shared inbox, and 1,000-plus Zapier integrations; it will happily serve a dentist, a gym, or a store. Postscript does one thing and does it far deeper, with ecommerce triggers, revenue attribution, and Shopify-native segments that SimpleTexting cannot approach. Pick SimpleTexting if texting is a customer-communication channel across your business. Pick Postscript if texting is a revenue channel attached to a Shopify cart.

Full Postscript vs SimpleTexting comparison

Postscript vs EZ Texting

from $25 per month on Launch, or $20 per month billed annually

EZ Texting is a two-decade-old general texting platform starting at $25 a month with credits, keywords, and a team inbox, aimed at local businesses and nonprofits. Postscript is a specialist ecommerce revenue tool with no relevance outside Shopify. If you run a gym, a church, or a services business, EZ Texting is the correct shape and Postscript is unusable. If you run a Shopify store doing serious volume, EZ Texting will feel like a generic messaging utility bolted onto the side of your commerce data.

Full Postscript vs EZ Texting comparison

Implementation & onboarding

Setup time: The app installs and connects to Shopify in under an hour, but you cannot send until carrier registration clears. Toll-free verification typically takes one to three weeks, A2P 10DLC brand and campaign registration usually one to four weeks, and a dedicated short code eight to twelve weeks. Plan on two to four weeks from install to first campaign, and start registration on day one.
Learning curve: Low for campaigns, moderate for automations. The flow builder is approachable but the value sits in the 45 segment filters and 85 trigger filters, and getting real leverage from those means understanding your own Shopify data well enough to know which ones matter. Most merchants get abandoned checkout and welcome flows live in week one and spend a quarter learning the rest.
Onboarding: Fully self-serve on Starter, Growth, and Professional. Live chat support arrives on Growth, a dedicated customer success manager on Professional and Enterprise. Support runs Monday to Friday, 9am to 8pm Eastern, which is worth knowing before a weekend flash sale.
Migration notes: Subscriber lists import by CSV, but you must carry over the consent record (source, timestamp, and opt-in language) rather than just the phone numbers, or you are sending to a list you cannot defend. Number porting from another provider is possible but adds time and is worth avoiding if you can simply provision a new toll-free number. Historical message and revenue data does not transfer, so plan on a reporting discontinuity, and rebuild flows manually because there is no cross-vendor flow importer.

Platform, API & security

Platforms: Web applicationShopify and Shopify Plus appUS and Canadian SMS and MMS deliveryToll-free, 10DLC, and dedicated short code
API: REST API available on the Professional tier and above, with public documentation for custom integrations, event ingestion, and data export. Enterprise adds a data warehouse push.
Compliance: TCPA-aligned consent capture and record keepingCTIA messaging principles and best practicesA2P 10DLC brand and campaign registrationToll-free verificationCarrier quiet hours enforced by recipient time zone
Data residency: US-hosted. No regional hosting options are advertised.
SSO: Available on Enterprise arrangements; not published as a self-serve tier feature.
Security notes: Postscript maintains an in-house compliance and legal function that monitors TCPA, CTIA, and carrier rule changes and pushes platform-level enforcement. Direct carrier relationships plus a Twilio partnership provide pre-paid bandwidth and redundancy for traffic spikes. Consent source, timestamp, and language are retained per subscriber.

Support & resources

Channels: Live chat on Growth and aboveEmail support on all plansHelp centerDedicated customer success manager on Professional and EnterpriseOnboarding specialist on Enterprise
Documentation: Help center and developer documentation covering setup, flows, segmentation, compliance, carrier registration, and the API. Support hours are Monday to Friday, 9am to 8pm Eastern.
Community: Active presence in the Shopify agency and DTC operator community, with a substantial partner and agency network rather than a formal user forum.

Company

Founded: 2018
Headquarters: Scottsdale, Arizona, United States
Ownership: Venture-backed
Founders: Adam Turner, Alex Beller
Employees: Roughly 280 to 310 (2026 estimates vary by data provider)
Funding: Approximately $138M raised in total, including a $65M Series C in June 2022 led by 01 Advisors with Twilio Ventures, Expanding Capital, m]x[v Capital, Greylock, Accomplice, Elephant, and OpenView participating. Current valuation is not publicly disclosed.

Funding history

Round	Amount	Year	Notes
Seed and Series A	Part of the $138M total	2019 to 2021	Early backing from Accomplice and Greylock as the Shopify SMS category formed.
Series B	Part of the $138M total	2021	Raised during the DTC and Shopify app boom.
Series C	$65M	2022	Led by 01 Advisors with Twilio Ventures participating, bringing total funding to roughly $138M.

Timeline

2018Founded by Adam Turner and Alex Beller as an SMS marketing app built exclusively for Shopify merchants.
2020Grows rapidly through the DTC boom as Shopify merchants add SMS alongside email, establishing Postscript as the category default in the Shopify App Store.
2022Raises a $65M Series C led by 01 Advisors with Twilio Ventures participating, bringing total funding to roughly $138M.
2023Deepens the automation layer with a drag-and-drop flow builder, expanded trigger and segment filters, and help desk routing into Gorgias and Zendesk.
2025Ships the AI layer: Brand Center for voice training, AI Infinity Testing for revenue-optimized message variants, and Shopper as a two-way conversational sales agent.
2026Moves to a co-CEO structure with Alex Beller on the core business and Adam Turner on AI, and adds Ask Shopper conversation analytics.

Integrations

Shopify and Shopify Plus (native)
Recharge
CartHook
Klaviyo
Gorgias
Zendesk
Okendo
Wonderment
Daasity
Slack
REST API on Professional and above
Data warehouse push on Enterprise

Frequently asked questions

11 questions

What is Postscript?

Postscript is an SMS and MMS marketing platform built exclusively for Shopify merchants. It collects subscribers through onsite popups, checkout opt-in, keywords, and QR codes, runs campaigns and automations through a drag-and-drop flow builder with more than 65 ecommerce triggers, segments on native Shopify data, reports revenue attribution, and includes an AI conversational sales agent called Shopper.

How much does Postscript actually cost per message?

The headline rate depends on your plan: roughly $0.015 falling toward $0.009 on Starter, $0.01 falling toward $0.008 on Growth, and about $0.007 on Professional. Carrier pass-through fees of roughly $0.003 per SMS segment are added on top on every plan, so your real all-in cost is closer to $0.018, $0.013, and $0.010 respectively. MMS runs about $0.045, $0.03, and $0.024 before carrier fees.

How are message segments counted?

Billing is per segment, not per message. A plain GSM-7 text message fits 160 characters in one segment, and multi-part messages drop to 153 characters per segment. Adding a single emoji or a curly quote switches the whole message to unicode encoding, which cuts the segment to 70 characters (67 for multi-part). A 300-character message with one emoji is five segments, not two, so it costs more than twice what you estimated.

What does A2P 10DLC registration cost and how long does it take?

Registration fees are set by The Campaign Registry and the carriers, not by Postscript. Expect roughly $4.50 for a sole proprietor brand or around $48 for a standard brand including vetting, about $15 for campaign registration, and a recurring campaign fee of roughly $1.50 to $10 a month depending on use case. Brand registration usually clears in one to three business days and campaign approval in three to seven, though busy periods stretch that. Budget one to four weeks end to end and start on the day you sign up.

Do I need a short code, a toll-free number, or a 10DLC number?

Postscript includes a verified toll-free number free on every plan, and that is where most merchants start; toll-free verification takes roughly one to three weeks. A dedicated short code costs $750 a month passed through at carrier cost with no Postscript markup and takes eight to twelve weeks to provision, which is worth it only if throughput or brand trust genuinely require it. Standard 10DLC local numbers are the cheapest option but carry the lowest throughput.

Do unused messages roll over?

There is nothing to roll over. Postscript does not sell message credits, so you pay for exactly what you send each month on top of the platform fee. The tradeoff is that you also cannot pre-buy volume at a discount the way you can with credit-based platforms like SimpleTexting or SlickText.

How does Postscript handle TCPA compliance and quiet hours?

Quiet hours are enforced by recipient time zone as a default rather than an optional setting, which addresses the most common source of TCPA exposure. Opt-in tooling captures consent with compliant language and stores the source, timestamp, and wording per subscriber. STOP and equivalent keywords are processed automatically and suppress the subscriber everywhere. Postscript keeps an in-house compliance and legal team that tracks rule changes and pushes platform-level updates. None of this makes you immune from liability, and you should still have your own counsel review your opt-in flow.

Does Postscript work with anything other than Shopify?

No. Postscript is a Shopify app and the entire product assumes Shopify's data model. There is no WooCommerce, BigCommerce, Magento, or headless integration. If you are on another cart, Emotive supports Shopify, WooCommerce, BigCommerce, and Magento and is the closer comparison.

Does Postscript send email too?

No, it is SMS and MMS only. You will run it alongside an email platform such as Klaviyo or Kit, which means maintaining two subscriber consent models and reconciling attribution across two systems with different windows. Postscript's default attribution is a 7-day click and 24-hour view, both adjustable, and aligning that with your email tool's window is worth doing before you compare channel performance.

How does revenue attribution work and can I trust it?

Postscript attributes orders on a 7-day click and 24-hour view window by default, with adjustable windows, customizable UTM parameters, and a custom short-link subdomain so traffic stays attributable in your own analytics. The numbers are computed by the vendor selling you the channel, so treat them as directional and reconcile against Shopify and Google Analytics before making budget decisions on them.

Who owns Postscript and is it financially stable?

Postscript is a private venture-backed company founded in 2018 by Adam Turner and Alex Beller, headquartered in Scottsdale, Arizona, with roughly 280 to 310 employees. It has raised about $138M including a $65M Series C in June 2022 led by 01 Advisors with Twilio Ventures participating. In early 2026 it moved to a co-CEO structure with Beller on the core business and Turner on AI.

Editorial verdict

Postscript is the strongest SMS platform in the Shopify ecosystem and it is not close, provided you are actually on Shopify and actually sending enough to justify the structure. The native data model, the depth of the segment and trigger filters, the quality of the subscriber collection tooling, and the fact that quiet hours and consent records are defaults rather than settings all reflect a team that has thought about this problem for eight years. The pricing is honest arithmetic: a platform fee that buys a lower per-message rate, with carrier fees disclosed rather than hidden. The reasons to look elsewhere are structural rather than qualitative. You cannot use it off Shopify, it does not send email, API access sits behind a $500 tier, and the $49 minimum spend means a small store is subsidizing capacity it will never use. If you run a Shopify store where SMS is a revenue line rather than an experiment, start here. If you run anything else, this product is not for you and no amount of feature depth changes that.

Written by the SaaSTracker editorial team. Awards, when shown, are judged against the published criteria in our methodology.

Awards & badges

1 held

Postscript holds 1 award from the SaaSTracker editorial program. Badges may be displayed by the vendor; each embed links back to this profile.

Category Leader · SMS Marketing

“SMS built for Shopify and nothing else, with the deepest revenue attribution in the category.”

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