Stack Internal vs Tettra
We give Stack Internal and Tettra the same GPA: 3.0 out of 4.0. Stack Internal grades higher on the free plan. Tettra grades higher on features. They get the same grade on value for money, ease of use and platforms.
Price, platforms and features side by side. The table says where each price was read and when.
Stack Internal
Verified company knowledge for teams and AI agents
Tettra
Internal knowledge base that answers team questions in Slack
How we grade them
| 3.0GPAStack InternalVery good | 3.0GPATettraVery good | |
|---|---|---|
| Value for money | BThere's no price to weigh. The only paid plan, Organization, is quoted by sales according to how many credits you need, and a B is where we put a tool whose paid side isn't published. It is metered, mind: a search or answer uses 1 credit and an update uses 3. | BScaling is $8 a user a month billed yearly, or $10 monthly, which is under what's typical here, and AI answers, the Slack bot and the API are all in. But the 10-user minimum sets the floor at ten seats, and SAML SSO and SCIM are paid add-ons unless you go Enterprise. |
| Free plan and trial | BStarter is free and comes with the trust engine, 4 connectors and the ingestion API. But it stops at 3 collaborators and 1,000 credits a month, and unused credits don't roll over. Enough to try it, tight for a real team. | CNo free plan. The trial is a decent one, though: 30 days with all features included and no credit card required. When it ends, you need a card to carry on. |
| Features | BDeep where it counts: answers carry reviewer, recency and corroboration labels, conflicts get flagged, and gaps are routed to your experts through Slack. The old Q&A, Articles and Collections are still here. But it captures from just four connectors, with an API for everything else. | APages you write or build from Google Docs and Markdown files, a store of answered questions, and Kai answering from all of it in Tettra and Slack. Experts verify pages on a schedule, and reports list what's stale or unowned. Read-only users, guests and page locking round it out. |
| Ease of use | BNo rating on record to go by, so a B is as high as we go. It runs in the browser with nothing to install. You'll want Slack or Microsoft Teams connected before it earns its keep, and credits take a little getting used to. | BNo rating on record to go by, so a B is as high as we go. It's used in a browser and through Slack, so there's nothing to install, and you can bring in the Google Docs you already have. The interface is English-only. |
| Platforms and integrations | BIt's a web app, with no desktop or phone apps listed. It connects to Slack, Microsoft Teams and Google Docs, and a REST API and an MCP server carry answers to assistants like Claude and Cursor. | BWeb only: Tettra's site lists no desktop or mobile apps. It works through Slack and connects to Google Workspace, GitHub and Zapier, with API access on the Scaling plan. |
| Best for | giving AI agents company answers they can trust | Slack teams tired of answering the same question |
The GPA is the average of the five grades: an A is 4 points, an F is none. The full reasons are on each tool's page: Stack Internal and Tettra. How we grade
Where they differ
- Stack Internal has a free plan. Tettra does not, though it has a free trial.
At a glance
| Stack Internal | Tettra | |
|---|---|---|
| Pricing | Free plan | Free trial |
| Starts at | Not published | $8 per user / month, billed yearly ($10 billed monthly), 10-user minimum |
| Free plan | Starter plan: up to 3 collaborators and 1,000 credits a month, with 4 connectors, the custom ingestion API and the trust engine. It has no SSO, audit logs or health and usage insights. | None |
| Free trial | None listed | Free 30-day trial with all features included, no credit card required |
| Web | ||
| Made by | Stack Exchange Inc. | Tettra, Inc. |
| Price read from | stackoverflow.co | tettra.com |
| Checked | Oct 6, 2026 | Oct 5, 2026 |
Who each one suits
Stack Internal
- Engineering organizations grounding AI agents in their own verified knowledge
- Teams whose answers get buried in Slack or Microsoft Teams threads
- Groups of up to three people trying it on the free Starter plan
Tettra
- Slack-based teams that field the same questions repeatedly
- Support and operations teams building an internal knowledge base
- Companies that want to reuse existing Google Docs as a wiki
Worth knowing
Stack Internal
- Usage is metered in Flow Credits: a search or answer uses 1 credit and an update uses 3. Credits reset each usage period and unused ones do not roll over.
- The free Starter plan allows 3 collaborators and 1,000 credits a month, and leaves out SSO, audit logs and health and usage insights.
- The Organization plan has no published price: it is quoted by sales according to the number of credits needed.
- Connecting a Stack Overflow enterprise Q&A instance requires a Stack Internal Community Enterprise plan.
Tettra
- There is no free plan: a card is required once the 30-day trial ends, and the Scaling plan has a 10-user minimum.
- Single sign-on (SAML) and SCIM provisioning are paid add-ons on Scaling and are included only in Enterprise.
- The app interface is English-only, although content can be written in any language.
- Tettra's site lists no desktop or mobile apps; it is used in a browser and through its Slack integration.
Key features
Stack Internal
- Automatic capture
- Connectors for Slack, Microsoft Teams, Google Docs and Stack Internal Community, plus a custom ingestion API, pull content in and break it into reusable units of knowledge.
- Trust engine and confidence labels
- Answers carry reviewer, recency and corroboration labels, and conflicting information is flagged, so a reader can tell when knowledge is reliable or needs validating.
- Expert validation
- Subject-matter experts are detected automatically and can also be managed by hand. Critical gaps trigger a validation workflow routed to them through Slack.
- Scopes and permissions
- Knowledge is organized into role-based Scopes so that people, teams and AI agents reach only what they should. Custom roles come with the Organization plan.
- Delivery to people and AI agents
- A chat interface, a REST API and an MCP server bring validated knowledge to people and to assistants and coding agents such as Claude and Cursor.
- Q&A, Articles and Collections
- The Community features keep Stack Overflow-style Q&A, long-form Articles, custom tags and curated Collections of related content.
Tettra
- Internal knowledge base
- Pages are written in Tettra's editor or built from existing Google Docs, Markdown files and other content, then grouped into categories with unlimited version history.
- AI answers from Kai
- When someone asks a question in Tettra or Slack, the Kai bot searches the knowledge base and replies. If it finds nothing, it helps assign the question to the right person.
- Questions and answers
- Questions and their answers are stored alongside pages, so a question that has been answered once can be found again instead of asked again.
- Verification and content reports
- Subject-matter experts verify pages on a set schedule, teammates can request new pages or updates, and reports list stale, unowned and public content.
- Slack integration
- From Slack, teammates can search Tettra, get AI answers in channels and direct messages, summarize threads and turn existing answers into knowledge base content.
- Sharing and permissions
- Single pages can be shared by link and whole categories published as external sites. Read-only users, guest users, invite-only categories and page locking control access.
Plans
Stack Internal
StarterFree
A workspace for up to 3 collaborators with 1,000 credits a month, 4 connectors, unlimited ingestion, the trust engine and standard permissions.
OrganizationCustom
Unlimited collaborators and a customized monthly credit allowance, plus SSO, custom roles for people and AI agents, and a usage dashboard.
Tettra
Scaling$8
per user / month, billed yearly ($10 billed monthly)
10-user minimum. AI answers, the Kai bot in Slack, Google Workspace integration, verification, usage analytics and API access.
EnterpriseCustom
SSO and SCIM included, hands-on training, custom import and onboarding, custom reporting and priority support.
Ways to pay less
Stack Internal
No public discounts listed.
Tettra
- Annual discount
20% off with yearly billing
Scaling is $8 per user a month billed yearly against $10 billed monthly. Tettra's pricing FAQ describes annual payment as earning two free months.
- Nonprofit
Non-profit pricing through sales
Tettra's pricing FAQ confirms discounted pricing for non-profit institutions, arranged through its sales team. No rate is published.
- Education
Educational pricing through sales
The same FAQ answer covers educational institutions, which are asked to contact the sales team for discounted pricing.
