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.
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 its Ari AI agent included with no per-resolution fee, 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 | $35/mo (Foundation, 1 seat included; $35 per additional seat) (7 days trial) | $29 per user per month, billed annually (free 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-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.
- 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.
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
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.
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
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 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 2026-08-22; Thena last reviewed 2026-08-22. Pricing is compiled from public sources and can change without notice. See our methodology.