Freedom251 › Knowledge base software
Stack Internal
What Stack Internal is
Stack Internal is a cloud knowledge product that collects and synthesizes information from AI tools, chat threads, and wikis into units of knowledge for people, teams, and AI agents. Those units can carry authorship, recency, usage, provenance, and conflict signals. Teams organize content in spaces and set permissions for people, teams, and agents. Connectors include Google Docs, Slack, Microsoft Teams, and Stack Internal Community, with an ingestion API for other tools. Its MCP server links AI assistants and coding agents, including Claude and Cursor, to Stack Internal knowledge. AI search or answers and single sign-on are supported. The Free plan costs nothing for up to 50 teammates. Starter is free, billed Free, with up to three collaborators, 1,000 credits per month, four connectors and a custom ingestion API, and unlimited ingestion. Organization pricing is based on needed Knowledge Flow Credits and requires contacting sales. Starter credits reset each usage period and unused credits do not roll over.
Who it suits
It suits enterprise teams that want to capture and organize knowledge from workplace tools, then make it available to employees and AI agents. Starter may fit smaller groups that can work within its collaborator and monthly credit limits.
What it does well
- Automatically captures information from AI tools, chats, and wikis.
- Knowledge units include provenance and conflict signals.
- Spaces support permissions for people, teams, and agents.
- MCP server connects Claude and Cursor.
- Maker says customer data is not used for model training.
What to know first
- Starter is limited to three collaborators.
- Starter includes up to 1,000 credits per month.
- Unused credits do not roll over.
- Organization pricing requires contacting sales.
Limits
The Free plan allows up to 50 teammates. Starter allows up to three collaborators and 1,000 credits per month; credits reset each plan usage period, and unused credits do not roll over.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Free | Up to 50 teammates | Free |
| Starter | Up to 1,000 credits/month · Up to 3 collaborators · 4 connectors and custom ingestion API · Unlimited reads · Unlimited ingestion · Standard permissions and self-service support | Free |
| Organization | Annual commitment; invoice billing available · Customized credits/month · Unlimited collaborators · Unlimited reads and additions · Custom roles and permissions · SSO · Audit logs · Dedicated account management | On request |
As stackoverflow.co lists them, read 23 Sept 2026. The maker's own page has the final word.
Getting started
- Visit the Stack Internal website.
- Choose the Free or Starter plan.
- Connect Google Docs, Slack, Microsoft Teams, or Stack Internal Community.
- Use the ingestion API to bring in data from other tools.
- Organize knowledge into spaces and set permissions.
- Connect an AI assistant or coding agent through the MCP server.
Verdict
Stack Internal combines knowledge capture, permissions, connectors, and AI access, with a free plan available. Check the collaborator and credit limits, or contact sales for Organization pricing.
Questions
Is Stack Internal free?
Yes. The Free plan costs nothing and supports up to 50 teammates. Starter also costs nothing, billed Free.
What does Starter include?
Starter includes up to three collaborators, 1,000 credits per month, four connectors and a custom ingestion API, and unlimited ingestion. Unused credits do not roll over.
What platforms does it support?
Stack Internal is available on web and through an API.
Which tools can it connect to?
Listed connectors are Google Docs, Slack, Microsoft Teams, and Stack Internal Community. An ingestion API supports other tools, and its MCP server connects AI assistants and coding agents.
Does Stack Internal support single sign-on?
Yes. Single sign-on is supported.
How is Organization priced?
Organization is billed through Contact sales, with pricing based on the number of Knowledge Flow Credits needed.
Facts from Stack Internal's own pages
- AI access
- Its MCP server connects AI assistants and coding agents, including Claude and Cursor, to Stack Internal knowledge. · stackoverflow.co, 8 Oct 2026
- AI model
- Stack Internal states that it uses Azure OpenAI GPT-4o mini for its AI functionality. · stackoverflow.co, 15 Oct 2026
- AI training
- The maker says it does not use customer data for model training. · stackoverflow.co, 8 Oct 2026
- API authentication
- Community API v3 uses OAuth tokens, supports read-only and read-write scopes, and offers persistent service applications for integrations. · support.stackenterprise.co, 15 Oct 2026
- API capabilities
- Stack Internal APIs support sign-in, ingestion, search, chat, administration, reporting, reads and writes. · support.stackinternal.com, 15 Oct 2026
- API rate limits
- New Community customers after October 1, 2025 receive 500 calls per day per application and 1,000 across applications unless they buy Premium API. · support.stackenterprise.co, 15 Oct 2026
- Capture
- It automatically captures and synthesizes data from AI tools, chat threads, and wikis into units of knowledge. · stackoverflow.co, 8 Oct 2026
- Community API
- Stack Internal Community API v3 is available at each customer site with interactive Swagger documentation and downloadable endpoint definitions. · support.stackenterprise.co, 15 Oct 2026
- Company founded
- Stack Overflow was co-founded by Jeff Atwood and Joel Spolsky in 2008. · crunchbase.com, 15 Oct 2026
- Company headquarters and size
- LinkedIn lists New York, New York headquarters and a 201–500 employee company size. · uk.linkedin.com, 15 Oct 2026
- Company legal name
- Crunchbase identifies the legal entity as Stack Exchange Inc. · crunchbase.com, 15 Oct 2026
- Credit limits
- Starter includes up to 1,000 credits per month; credits reset each plan usage period and unused credits do not roll over. · stackoverflow.co, 8 Oct 2026
- Data protection
- The service requires HTTPS, encrypts data in transit and at rest, uses SQL Transparent Data Encryption and AES-256, and says customer data is not used to train models. · stackoverflow.co, 15 Oct 2026
- Documentation and setup
- The administrator quickstart covers SSO, content-source configuration, Slack and Google Docs connections, MCP activation and API guidance. · support.stackinternal.com, 15 Oct 2026
- Encryption
- The security FAQ says data is encrypted in transit and at rest, and Azure data at rest uses AES-256. · stackoverflow.co, 8 Oct 2026
- Free plan
- Yes · stackoverflow.co, 23 Sept 2026
- Governance
- Administrators can manage permissions, curation activity and audit logs for people, teams and AI agents. · stackoverflow.co, 15 Oct 2026
- Hosting model
- Official materials describe Azure-hosted Business and Enterprise cloud options and do not document customer self-hosting or on-premises installation. · stackoverflow.co, 15 Oct 2026
- Integrations
- Listed integrations include ChatGPT, Claude Code, Confluence, Cursor, Gemini, GitHub, Jira, Notion, OpenAI, ServiceNow, Slack, Microsoft Teams and Google Docs. · stackoverflow.co, 15 Oct 2026
- Intended users
- The maker describes Stack Internal as a knowledge intelligence ecosystem for enterprises and says it is used by over 20,000 organizations. · stackoverflow.co, 8 Oct 2026
- Knowledge capture
- It ingests scattered information from AI tools, chats, wikis, files and connected sources into reusable knowledge units. · stackoverflow.co, 15 Oct 2026
- Knowledge validation
- Each knowledge item carries provenance, authorship, recency, usage and conflict signals, with SME validation routing for gaps. · stackoverflow.co, 15 Oct 2026
- Limit: adoption and small teams
- TrustRadius reviewers say small organizations may lack enough activity to justify the product and that daily adoption can be difficult. · trustradius.com, 15 Oct 2026
- Limit: long-form documentation
- Reviewers say the Q&A structure is weaker for lengthy formal documentation and that organization becomes difficult as content grows. · trustradius.com, 15 Oct 2026
Where Stack Internal stands on Freedom251
- Knowledge base software#20 of 138
- AI Knowledge Base Software#13 of 36
- Internal Knowledge Base Software#13 of 25