Is Plain or Unthread cheaper?

Plain starts at $35/mo (Foundation, 1 seat included; $35 per additional seat) (7 days trial). Unthread starts at $50 per agent per month, billed annually, with a 5-seat minimum ($250 a month floor) (14 days trial).

Plain vs Unthread

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

Editorial assessment

Unthread compared with Plain

Plain is the other serious B2B support tool built for teams whose customers live in shared channels, with a strong API-first philosophy, a GraphQL interface, and its Ari AI agent included with no per-resolution fee. Plain is the better fit for engineering-led teams who want to build their own support surface programmatically. Unthread is more of a finished help desk out of the box, with SLA monitoring, on-call alerting, approvals, and 100-plus prebuilt integrations. Choose Plain if you want to compose support into your own product; choose Unthread if you want it working next week.

Choose Plain if

B2B software companies, especially developer-tools and infrastructure startups, whose customers are technical, whose support arrives in shared Slack, Teams, or Discord channels, and who have engineering capacity to use an API-first platform properly.

Choose Unthread if

B2B software companies that run shared Slack Connect or Microsoft Teams channels with their customers and have lost control of them, plus internal IT, HR, and employee support teams whose requests already arrive as Slack messages. It suits companies with a modest number of high-value accounts rather than a long tail of consumers.

Side by side

13 attributes

Attribute	Plain	Unthread
Category	Support	Support
Starting price	$35/mo (Foundation, 1 seat included; $35 per additional seat) (7 days trial)	$50 per agent per month, billed annually, with a 5-seat minimum ($250 a month floor) (14 days trial)
Pricing model	Tiered subscription with a base price that includes a block of seats, per-additional-seat pricing on top, and a monthly Sidekick credit allowance per tier. Ari, the customer-facing AI agent, is included at no per-resolution charge. Monthly or annual billing, with unlimited free viewer seats on every plan.	Per-agent subscription billed annually with a five-seat minimum, an entry-tier conversation cap, and AI included in the seat price rather than metered per resolution.
Free plan	No	No
Free trial	7 days, no credit card required	14 days on Basic and Pro
Best for	B2B software companies, especially developer-tools and infrastructure startups, whose customers are technical, whose support arrives in shared Slack, Teams, or Discord channels, and who have engineering capacity to use an API-first platform properly.	B2B software companies that run shared Slack Connect or Microsoft Teams channels with their customers and have lost control of them, plus internal IT, HR, and employee support teams whose requests already arrive as Slack messages. It suits companies with a modest number of high-value accounts rather than a long tail of consumers.
Setup time	A working workspace with Slack and email connected in an afternoon. Getting real value (workflows routing to Linear, customer cards populated from your own API, Ari trained on your documentation, SLAs configured) is more like two to four weeks with engineering involvement.	A working Slack deployment in a day: install the app, connect the shared channels, define teams and SLA policies, and configure automatic ticket detection. Adding AI grounded in documentation and tuning triage takes another week of iteration.
Learning curve	Low for agents, moderate to high for the person configuring it. The API-first design means the best implementations involve writing code, and teams that treat Plain as a point-and-click help desk will under-use it. The 7-day trial is short for a proper technical evaluation, so plan the pilot before starting the clock.	Very low for agents, because the primary interface is Slack and they are already fluent in it. Moderate for administrators configuring SLA policies, branching workflows, escalation paths, and knowledge base sync. The main change management cost is cultural rather than technical: getting a team used to the idea that a Slack message is now a tracked ticket.
Platforms	Web app, Slack, Microsoft Teams, and Discord integrations, Embeddable chat and forms, Customer portal, GraphQL API, MCP server	Slack app, Microsoft Teams app, Web console, Web chat widget, Email intake, API intake
Compliance	GDPR handling as a UK-incorporated operator (Not Just Tickets Ltd), Advanced security controls positioned on the Frontier tier; detailed certification evidence is not published on the marketing pages	SOC 2, GDPR, HIPAA with a BAA on the Enterprise tier
Founded	2020	2022
Headquarters	London, United Kingdom (with a San Francisco office opened after the 2025 Series A)	New York, New York, United States
Ownership	Venture-backed; operated as Not Just Tickets Ltd	Venture-backed

Strengths and limitations

Plain

Strengths

Slack, Teams, and Discord are treated as genuine support channels with assignment, status, and SLA tracking, which no general-purpose help desk in this set does properly.
Ari is included with no per-resolution fee, which means deflection success lowers your cost per conversation instead of inflating the invoice.
Unlimited free viewer seats let an entire engineering organisation follow customer threads without a per-seat charge, matching how B2B software companies actually work.
The GraphQL API, MCP server, and bring-your-own-agent model make Plain programmable in a way that lets a team build its own support surface rather than living inside the vendor's UI.

Limitations

The $35 to $299 tier jump is severe, and the per-additional-seat price nearly triples across it, so a team crossing from Foundation to Horizon sees a step change rather than a gradient.
Sidekick credits are metered by effort rather than volume, which makes the variable portion of the bill genuinely hard to forecast month to month.
No voice or telephony of any kind, and no realistic path to phone support.
Wrong shape for consumer and ecommerce support: no order-management story, no Shopify depth, and a channel mix aimed at business customers.

Unthread

Strengths

The shared-channel model is genuinely unserved by general-purpose help desks, and Unthread solves the specific failure mode (silently missed messages across dozens of channels) rather than approximating it.
Slack and Microsoft Teams are both first-class channels, which matters because B2B customer preference splits cleanly between them.
AI is included in the seat price with no per-resolution meter, so a deflection rate reported at roughly 40 percent from day one reduces workload without increasing the invoice.
The self-learning knowledge base converts one-off expert answers in a thread into reusable content, which is the exact loss that shared-channel support otherwise causes.

Limitations

The five-seat minimum makes the real entry price $250 to $375 a month, which is four to five times a comparable Zoho Desk or Jitbit configuration and excludes genuinely small teams.
Basic's 100-conversation monthly cap makes it an evaluation tier rather than a working plan, so the honest price is Pro at $75 a seat.
The entire premise fails for consumer and ecommerce businesses whose customers are not in a shared workspace, so the addressable use case is narrow by design.
No light-agent or read-only seat tier, so giving engineering or finance ticket visibility costs full seats or requires routing through Jira and Linear instead.

Pricing compared

Plain

Tiered subscription with a base price that includes a block of seats, per-additional-seat pricing on top, and a monthly Sidekick credit allowance per tier. Ari, the customer-facing AI agent, is included at no per-resolution charge. Monthly or annual billing, with unlimited free viewer seats on every plan.

Foundation$35
Horizon$299
FrontierCustom

Plain is not cheap per seat, and it is not trying to be. Foundation at $35 a seat is above Help Scout's $21 annual Standard rate and far above Chatwoot's $19, and Horizon's $99 additional seats are the highest published in this comparison set. What you get for it is a different set of economics: free unlimited viewers, a customer-facing AI agent with no resolution meter, and an API deep enough that engineering can build rather than request. For a fifteen-person B2B software company where five people answer and ten need to read, Plain frequently comes out cheaper in total than a $25-per-seat platform charging for all fifteen plus $0.75 per AI resolution. For a non-technical team of five doing email support, it is simply expensive. The startup programme's 50% discount materially changes the calculation for early-stage companies and is worth asking about before comparing list prices.

Unthread

Per-agent subscription billed annually with a five-seat minimum, an entry-tier conversation cap, and AI included in the seat price rather than metered per resolution.

Basic$50
Pro$75
EnterpriseCustom

Model a four-agent team at 500 and at 2,000 tickets a month, the benchmark used across this category. Unthread forces you to five seats, and 500 conversations blows straight through the Basic plan's 100-conversation cap, so the honest answer at both volumes is Pro at $75 across five seats: $375 a month, unchanged between 500 and 2,000 tickets because nothing meters volume above Basic and AI is not charged per resolution. That is materially cheaper than roughly $1,106 on Intercom or $1,420 on Zendesk once AI resolutions are counted, and four to five times more expensive than $92 on Zoho Desk Professional or $69 on Jitbit. The premium is entirely for the channel model. If your customers genuinely run their support through shared Slack channels, no general-purpose help desk solves that, and $375 a month is a reasonable price for turning forty unmanaged channels into a measured queue with SLAs, escalation, and per-account reporting. If your customers email you, you are paying a large premium for a capability you will not use, and the value case collapses.

Editorial verdict on each

Plain

Plain is the sharpest product in this category for a specific and growing shape of company: B2B software businesses whose customers are engineers, whose support lands in Slack, and whose escalations end in Linear. The channel model is right, the free viewer seats reflect how those teams actually operate, the GraphQL API and MCP server make it programmable rather than merely configurable, and including Ari with no per-resolution charge is a genuinely pro-customer stance while the rest of the category moves toward metering. The reservations are the brutal $35 to $299 tier gap, Sidekick credits that are hard to forecast because they meter effort rather than volume, no voice channel, and no free plan. Buy Plain if your customers write to you in a shared Slack channel. If they do not, almost everything here will serve you better and cost less.

Read the full Plain profile

Unthread

Unthread solves a real problem that general-purpose help desks do not attempt: B2B support has migrated into shared Slack and Microsoft Teams channels, and those channels have no owners, no SLAs, and no measurement. Turning that into a tracked queue while leaving the customer's experience untouched is genuinely valuable, and the supporting machinery (live SLA monitoring, on-call alerting, bidirectional Jira and Linear sync, per-account analytics, AI included rather than metered per resolution) is more complete than the company's size would suggest. The reservation is the price floor. A five-seat minimum at $75 on Pro means $375 a month before anyone files anything, four to five times what Zoho Desk or Jitbit charge for equivalent headcount, and Basic's 100-conversation cap makes the cheaper tier an evaluation plan rather than a working one. Buy it if your customers stopped emailing you and started messaging you, and if you have enough high-value accounts that losing track of one is expensive. If your customers still email, this is an expensive answer to a question you do not have.

Read the full Unthread profile

Plain profile last reviewed 2026-08-22; Unthread last reviewed 2026-08-22. Pricing is compiled from public sources and can change without notice. See our methodology.