By the Numbers vs Klaviyo
An independent, review-free comparison compiled by the SaaSTracker editorial team. Both products are profiled in full, and neither can pay for placement here.
The short answer
Both sides assessedBy the Numbers compared with Klaviyo
Complementary and cheap enough to be additive rather than a replacement. Klaviyo segments well inside its own data; By the Numbers brings order, product, and channel dimensions Klaviyo does not model as richly, then pushes the result back into Klaviyo hourly. At $19 the overlap costs little, which is a different calculation from adding a $149 tool for the same reason.
Klaviyo compared with By the Numbers
Complementary and cheap enough not to be a real decision. Klaviyo segments well within its own data; By the Numbers models order, product, lifetime value, and acquisition channel dimensions more richly and pushes the results back into Klaviyo hourly, from $19 a month. The overlap is real but the price makes it additive rather than competitive.
Choose By the Numbers if
Cost-conscious Shopify stores that want a real RFM segmentation model with fast audience syncing into email and paid social, plus broad reporting, without paying analytics-suite prices or waiting a day for audiences to refresh.
Choose Klaviyo if
Direct-to-consumer and ecommerce brands on Shopify, BigCommerce, or WooCommerce doing enough revenue that abandoned-cart and post-purchase flows pay for the subscription several times over, and who want segmentation driven by purchase behavior rather than by tags they maintain by hand.
Side by side
13 attributes| Attribute | By the Numbers | Klaviyo |
|---|---|---|
| Category | Segmentation | ESPs |
| Starting price | $19 per month (14 days trial) | $0 (free up to 250 profiles), then roughly $30/mo at 1,000 active profiles (free plan available) |
| Pricing model | Flat monthly subscription sold through the Shopify App Store, with tiers rising by feature and scale from a $19 entry plan. | Self-serve tiers priced by active (marketable) profile count, with a monthly email send allowance of roughly ten times the profile count; SMS is sold as a higher Email plus SMS plan with its own message credits, and the newer data, service, and AI product lines meter separately. |
| Free plan | No | Up to 250 profiles, 500 emails per month, $5 of mobile messages per month, and 10,000 Composer credits, with email support limited to the first 60 days. |
| Free trial | 14 days, no credit card required | No fixed-length trial; the free tier up to 250 profiles is the evaluation path |
| Best for | Cost-conscious Shopify stores that want a real RFM segmentation model with fast audience syncing into email and paid social, plus broad reporting, without paying analytics-suite prices or waiting a day for audiences to refresh. | Direct-to-consumer and ecommerce brands on Shopify, BigCommerce, or WooCommerce doing enough revenue that abandoned-cart and post-purchase flows pay for the subscription several times over, and who want segmentation driven by purchase behavior rather than by tags they maintain by hand. |
| Setup time | About a minute to install and connect, with the RFM matrix populating shortly after against the store's existing history. Sync connections to Klaviyo, Meta, Google, and TikTok take a few minutes each. | An afternoon for a Shopify store to be sending. The store connector installs in one click and backfills order history, the onsite snippet goes on automatically, and the prebuilt flows can be turned on with default content the same day. Getting the flows genuinely good, with branded templates and considered branching, is a two to four week project. |
| Learning curve | Low to moderate. The pre-built matrix and reports require nothing, but getting value from the seventy-five filters means knowing what you want to isolate, which is more work than describing a segment in a sentence. | Moderate and front-loaded. The flow builder and campaign sending are approachable, but segment logic over event properties is where people get stuck, because it asks you to think in terms of events and their metadata rather than in terms of lists. Anyone who has only used tag-based ESPs will need a week to stop fighting the model. |
| Platforms | Shopify app, Web dashboard | Web application, iOS and Android apps for reporting, Mobile SDKs for push, Onsite JavaScript library |
| Compliance | Operates on Shopify customer data under the store's own privacy obligations, Server-side conversion tracking makes the store responsible for the lawful basis of the data it forwards to ad platforms, Audience syncing to Meta, Google, and TikTok carries the store's own consent obligations for advertising audiences | SOC 2, GDPR with a data processing agreement, CCPA |
| Founded | 2022 | 2012 |
| Headquarters | Not disclosed | Boston, Massachusetts, United States |
| Ownership | Privately held, operated by Unsupervised LLC | Publicly traded on the NYSE under the ticker KVYO |
Strengths and limitations
By the Numbers
Strengths
- The lowest entry price in the category by a wide margin, starting at $19 a month.
- A genuine sixteen-cell RFM matrix rather than the simplified three-bucket version most cheap tools ship.
- Hourly audience refresh, faster than the daily sync most competitors offer.
- More than seventy-five segment filters spanning orders, products, lifetime value, and acquisition channel.
Limitations
- Almost no public information about the vendor: no named founders, no funding history, no disclosed team.
- Shopify only, with no path for stores on other platforms.
- Segments are built by assembling filters rather than described in plain language, which is slower for non-analytical users.
- No documented public API, so segments cannot be pushed into custom internal systems.
Klaviyo
Strengths
- The data model is the real product: live segments over order history, browsing behavior, and predicted values give you targeting no tag-based ESP can express.
- Revenue attribution per flow and campaign is credible because Klaviyo already holds the order events, which makes the subscription defensible to whoever signs off on spend.
- Suppressed profiles stop counting toward the bill, so unsubscribes and bounces reduce cost rather than becoming permanent dead weight.
- Prebuilt ecommerce flows mean a new store can have abandoned cart, welcome, browse abandonment, and post-purchase live in days rather than designing automation from a blank canvas.
Limitations
- Expensive at scale. Roughly $720 a month at 50,000 profiles is several times what Brevo, Omnisend, or MailerLite charge for comparable list sizes, and the per-profile rate does not improve as you grow.
- The send allowance of about ten times your profile count constrains high-frequency senders, so a daily-mailing brand can be forced into a higher band by volume rather than by list growth.
- No advertised annual discount on self-serve plans, removing a lever that almost every competitor offers.
- The email editor is functional rather than delightful; teams coming from MailerLite or Kit usually find it a step down aesthetically.
Pricing compared
By the Numbers
Flat monthly subscription sold through the Shopify App Store, with tiers rising by feature and scale from a $19 entry plan.
- EntryFrom $19
- Higher tiersPublished on the App Store listing
On paper this is the best capability-per-dollar in the category and it is not close: a sixteen-cell RFM matrix, seventy-five filters, hourly syncing, and thirty-eight reports for a starting price under a fifth of what Tresl charges and a third of Repeat Customer Insights. The question is not whether it is cheap, it is whether the vendor is durable, since there is no public corporate information behind an app around two thousand stores now depend on. For a store weighing $19 against not segmenting at all, that risk is easy to accept. For one about to make it the backbone of every audience in Meta and Klaviyo, keep the segment definitions documented somewhere you control.
Klaviyo
Self-serve tiers priced by active (marketable) profile count, with a monthly email send allowance of roughly ten times the profile count; SMS is sold as a higher Email plus SMS plan with its own message credits, and the newer data, service, and AI product lines meter separately.
- Free$0
- Email (1,000 profiles)Approximately $30
- Email (10,000 profiles)Approximately $150
- Email (50,000 profiles)Approximately $720
- Enterprise and additional product linesQuoted
For a store with real order volume, Klaviyo at 1,000 or 10,000 profiles is straightforwardly good value, because the four standard flows typically return several multiples of the subscription and the attribution report proves it in a currency the founder already thinks in. The suppression policy is a genuine and underrated saving, since you are not paying rent on people who left. Value collapses in two situations: a large list without commerce revenue behind it, where $720 a month at 50,000 profiles buys reporting you cannot monetize, and a business that lets the SMS, reviews, and data product lines accumulate until the email tool costs enterprise money. Judged strictly as ecommerce email, it is expensive and worth it; judged as a general-purpose ESP, it is the wrong shape at the wrong price.
Editorial verdict on each
By the Numbers
By the Numbers is the best capability-per-dollar in customer segmentation, and the gap is large enough that price alone settles many decisions. A real sixteen-cell RFM matrix, seventy-five filters, hourly syncing into Klaviyo and the ad platforms, and a broad reporting layer starting at $19 is not a stripped-down version of what competitors charge $150 for, it is most of the same job done more cheaply and, on refresh speed, done better. Two caveats. The vendor publishes essentially nothing about itself, so keep your important segment definitions written down somewhere you control, and confirm on the App Store listing which tier actually includes the sync before assuming the entry price covers it. For a Shopify store that has been putting off segmentation on cost grounds, there is no longer an excuse at this price.
Read the full By the Numbers profileKlaviyo
Klaviyo is the correct default for an ecommerce brand with enough order volume that automated flows are a revenue line rather than a nice-to-have. The customer database underneath, the live segmentation over purchase and browsing behavior, and the revenue attribution that makes the spend defensible are genuinely a class above what general-purpose ESPs offer, and billing only for marketable profiles is a fairer meter than most of the category uses. The costs are real: no annual discount, a send allowance tied to list size, a per-profile rate that never improves with scale, and a growing set of adjacent products that each want their own line on the invoice. Buy it if a checkout produces your revenue and you intend to run serious flows. Do not buy it for a newsletter, a service business, or a big list with thin margins, where you will pay ecommerce prices for reporting you cannot cash.
Read the full Klaviyo profileBy the Numbers profile last reviewed 2026-09-02; Klaviyo last reviewed 2026-08-22. Pricing is compiled from public sources and can change without notice. See our methodology.