Plain vs Thena
An independent, review-free comparison compiled by the SaaSTracker editorial team. Both products are profiled in full, and neither can pay for placement here.
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The short answer
Editorial assessmentThena compared with Plain
Plain is the API-first option for the same audience: a GraphQL interface, a strong developer story, and an Ari AI agent metered from a monthly credit allowance at 100 credits a resolution, aimed at engineering-led teams who want to compose support into their own product. Thena is a more conventional help desk with boards, routing, SLAs, and dashboards that a non-engineer can configure, at a lower entry price. Choose Plain if you want to build your support surface; choose Thena if you want to configure one.
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 Thena if
Small and mid-sized B2B software companies whose customers already talk to them in shared Slack channels, particularly early-stage teams who want the shared-channel support model without the $250 to $375 monthly floor that competitors impose. It also suits internal support teams whose requests arrive as Slack messages.
Side by side
13 attributes| Attribute | Plain | Thena |
|---|---|---|
| Category | Support | Support |
| Starting price | $45 per user per month billed annually (Foundation, $55 monthly) (7 days trial) | $29 per user per month, billed annually (free trial) |
| Pricing model | Per-seat subscription in three tiers, each with a seat band and a monthly credit allowance that both AI agents draw on. Ari, the customer-facing agent, costs 100 credits per resolution; Sidekick, the internal copilot, costs 15 to 300 or more credits depending on the effort a task takes. Viewer seats are unlimited and free on every plan. Billed annually or monthly, with the annual rate roughly 20% lower and double the included credits. | Per-user subscription billed annually across three tiers, with a seat cap and ticket cap on the entry plan, AI included in every tier, and no per-resolution charge. |
| Free plan | No | No |
| Free trial | 7 days, no credit card required | Trial available; the entry Starter plan is the practical evaluation path |
| 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. | Small and mid-sized B2B software companies whose customers already talk to them in shared Slack channels, particularly early-stage teams who want the shared-channel support model without the $250 to $375 monthly floor that competitors impose. It also suits internal support teams whose requests arrive as Slack messages. |
| 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 under a day: install the app, connect shared channels, set up boards and routing, and define SLA policies. Tuning AI ticket detection so it neither misses requests nor converts small talk takes another week of observation. |
| 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, since the primary surface is Slack. Moderate for administrators configuring boards, custom fields, routing rules, SLA policies, and role-based access. The genuine change management cost is cultural: teaching a team that a Slack message is now a tracked ticket with a clock on it. |
| Platforms | Web app, Slack, Microsoft Teams, and Discord integrations, Embeddable chat and forms, Customer portal, GraphQL API, MCP server | Slack app, Microsoft Teams app (Enterprise tier), Discord, Web console, Web chat widget, Web forms, Email 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 | GDPR, Enterprise security controls on the top tier |
| Founded | 2020 | 2022 |
| Headquarters | London, United Kingdom (with a San Francisco office opened after the 2025 Series A) | United States, operating as Pivoting Owl Inc with a distributed team |
| 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.
- Both AI agents run from one credit pool rather than a separate per-resolution invoice line, so AI spend is capped by the allowance you bought instead of accruing unpredictably.
- 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
- Ari stopped being free. The October 2026 pricing page meters a customer-facing resolution at 100 credits, so Foundation's 1,000 monthly credits cover about ten of them, and the pricing page publishes no rate for buying more.
- 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.
Thena
Strengths
- The cheapest genuine entry into shared-channel B2B support at $29 per user, against a $250 to $375 monthly floor at the nearest competitor.
- AI is included at every tier with no per-resolution charge, including ticket detection, summaries, tagging, and an assistant on the $29 plan.
- Account-based tracking rolls support activity up per customer, which is the reporting shape B2B companies with named accounts need and most general help desks handle poorly.
- Channel coverage is unusually broad for a company this size: Slack, email, web chat, web forms, Discord, and Microsoft Teams.
Limitations
- Microsoft Teams support is confined to the $119 Enterprise tier, which is a severe gate given how many B2B customers standardise on Teams and a clear disadvantage against Unthread.
- The Starter plan's dual cap of 5 users and 1,000 tickets a month binds quickly, so the $29 headline price often has a short shelf life.
- The premise fails entirely for consumer and ecommerce businesses whose customers are not in a shared workspace.
- No published light-agent or read-only seat tier, so giving engineering or finance visibility costs full seats.
Pricing compared
Plain
Per-seat subscription in three tiers, each with a seat band and a monthly credit allowance that both AI agents draw on. Ari, the customer-facing agent, costs 100 credits per resolution; Sidekick, the internal copilot, costs 15 to 300 or more credits depending on the effort a task takes. Viewer seats are unlimited and free on every plan. Billed annually or monthly, with the annual rate roughly 20% lower and double the included credits.
- Foundation$45
- Horizon$99
- FrontierCustom
Plain repriced in 2026 and the shape of the deal changed with it. Where Foundation was $35 a month for a seat with the AI agent thrown in, it is now $45 per seat per month billed annually with AI metered out of a 1,000-credit allowance, and Horizon doubles that to $99 with a three-seat minimum. Against Help Scout's $25 Standard seat or Chatwoot's $19, Plain is now clearly the premium option on list price, and the credit meter means a successful deflection programme costs more rather than less. What still justifies it for the right buyer: unlimited free viewer seats, so a fifteen-engineer company can pay for five and let everyone read; Slack, Teams and Discord as first-class channels rather than integrations; and a GraphQL API deep enough to build your own support surface. For a five-person developer-tools company whose customers file issues in Slack, that combination has no real substitute and the startup programme's 50% takes the sting out. For a non-technical team doing email support, Plain is now expensive in both dimensions, seat and usage, and the alternatives are better value.
Thena
Per-user subscription billed annually across three tiers, with a seat cap and ticket cap on the entry plan, AI included in every tier, and no per-resolution charge.
- Starter$29
- Standard$79
- Enterprise$119
Take the benchmark this directory uses: a four-agent team at 500 and at 2,000 tickets a month. At 500 tickets, Thena Starter at $29 per user is $116 a month, comfortably inside both the 5-user and 1,000-ticket caps. At 2,000 tickets the ticket cap forces a move to Standard at $79 per user, so $316 a month. Compare with Unthread's five-seat minimum putting the same team at $375 on Pro at both volumes, roughly $1,106 on Intercom and roughly $1,420 on Zendesk once AI resolutions are counted, $92 on Zoho Desk Professional, and $69 on Jitbit. Thena is by a clear margin the cheapest way to run shared-channel support at low volume, and remains cheaper than Unthread at high volume. The caveat is that the Starter tier's caps are the product's real pricing model, and both of them bind early: five users and a thousand tickets is a small company, not a growing one. Price against Standard if you expect either number to move within a year, and against Enterprise at $119 if any meaningful part of your customer base uses Microsoft Teams.
Editorial verdict on each
Plain
MomentumPlain 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 and one credit pool is simpler to govern than a separate AI invoice. The reservations grew in 2026: the entry seat is $45 and Horizon is $99 with a three-seat minimum, Ari went from included to 100 credits a resolution, credits are hard to forecast because Sidekick meters effort rather than volume, there is no voice channel, and there is 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 profileThena
Thena is the cheapest credible way to put ticketing discipline underneath shared Slack channels, and for an early-stage B2B company that is the deciding fact. At $29 per user with AI ticket detection, summaries, tagging, SLAs, and account-level reporting included, a four-agent team pays $116 a month against $375 for the nearest equivalent and roughly $1,420 for a comparable Zendesk configuration. Discord support is a real differentiator for community-led developer products, and nothing is billed per AI resolution, so deflection is not taxed. Two things need modelling before you buy. The Starter tier's caps of five users and a thousand tickets bind early, so price against Standard at $79 if either number will move within a year. And Microsoft Teams sits at $119 per user, so a customer base that standardises on Teams makes Unthread the better fit despite its higher entry price. Slack-first, budget-conscious, and growing: buy Thena. Teams-heavy or escalation-heavy: buy Unthread.
Read the full Thena profilePlain profile last reviewed 2026-10-01; Thena last reviewed 2026-10-01. Pricing is compiled from public sources and can change without notice. See our methodology.
The best in Customer Support Platforms
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A $15M Series A in February 2025 and a customer list spanning Vercel, Cursor, and Raycast mark Plain as the breakout support desk for developer tools.
Fin answered the pricing question AI support created: 99 cents per resolved conversation, with humans only where the agent fails.
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Frequently asked questions
6 questionsWhat is the difference between Plain and Thena?
Plain is the API-first option for the same audience: a GraphQL interface, a strong developer story, and an Ari AI agent metered from a monthly credit allowance at 100 credits a resolution, aimed at engineering-led teams who want to compose support into their own product. Thena is a more conventional help desk with boards, routing, SLAs, and dashboards that a non-engineer can configure, at a lower entry price. Choose Plain if you want to build your support surface; choose Thena if you want to configure one.
Is Plain or Thena cheaper?
Plain starts at $45 per user per month billed annually (Foundation, $55 monthly) (7 days trial). Thena starts at $29 per user per month, billed annually (free trial). The billing models differ, so the entry price is rarely the whole cost. Plain pricing model: Per-seat subscription in three tiers, each with a seat band and a monthly credit allowance that both AI agents draw on. Thena pricing model: Per-user subscription billed annually across three tiers, with a seat cap and ticket cap on the entry plan, AI included in every tier, and no per-resolution charge.
Does Plain or Thena have a free plan?
Plain has no free plan. Trial terms: 7 days, no credit card required. Thena has no free plan. Trial terms: Trial available; the entry Starter plan is the practical evaluation path.
Who should choose Plain?
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.
Who should choose Thena?
Small and mid-sized B2B software companies whose customers already talk to them in shared Slack channels, particularly early-stage teams who want the shared-channel support model without the $250 to $375 monthly floor that competitors impose. It also suits internal support teams whose requests arrive as Slack messages.
What are the best alternatives to Plain and Thena?
SaaSTracker profiles 27 products in Customer Support Platforms. The Summer 2026 awards in the category went to Help Scout (Category Leader), tawk.to (Best Value), Intercom (Innovation). Every profile is compiled from primary sources, so a shortlist can be built from pricing, limitations, and fit rather than from star ratings.
