Tettra

Documentation · Free · since 2015

Tettra is a simple internal knowledge base with AI-powered answers and Slack integration. It handles ai answers, slack integration, verification, and templates, and it's best suited for teams wanting a simple internal knowledge base. It has been around since 2015, giving it a 11-year head start in building out integrations and refining the product.

The free plan is free for up to 5 users — enough for most people to evaluate whether it fits. It's designed for small teams, striking a balance between simplicity and collaboration features.

pros

Includes AI Answers as a core feature, purpose-built for documentation workflows
Includes Slack Integration as a core feature, purpose-built for documentation workflows
Free for up to 5 users — generous enough for most small teams to get real work done
Established product with 11+ years on the market and a mature ecosystem

cons

Free plan exists but key features are locked behind the paid upgrade
Fewer built-in features means you may need additional tools to cover gaps
Ecosystem of third-party integrations is smaller than the market leaders in documentation
Limited team/admin features if your organization eventually scales up

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