Outline vs Tettra
Outline is open-source knowledge base with beautiful design, real-time collaboration, and API, while Tettra is simple internal knowledge base with AI-powered answers and Slack integration. Outline is open source and can be self-hosted, giving you full control over your data. Outline is built for teams wanting a fast, beautiful open-source wiki, whereas Tettra targets teams wanting a simple internal knowledge base.
At a glance
|
Outline
|
Tettra
|
|
|---|---|---|
| Best for | Teams wanting a fast, beautiful open-source wiki | Teams wanting a simple internal knowledge base |
| Starting price | Free | Free |
| Free tier | ✓ | ✓ |
| Open source | ✓ | — |
| Free tier available | ✓ | ✓ |
| Open source | ✓ | — |
| AI Answers | — | ✓ |
| API | ✓ | — |
| Markdown | ✓ | — |
| Open Source | ✓ | — |
| Real-Time | ✓ | — |
| Slack Integration | — | ✓ |
| Templates | — | ✓ |
| Verification | — | ✓ |
Outline
Strengths
- Open source and transparent
- Open-source codebase gives you full transparency and community-driven development
- Fully open-source — you can self-host, audit the code, and avoid vendor lock-in
- The core product is free with no paywalled essentials
Weaknesses
- May lack some advanced features
- Self-hosting is free but requires server maintenance and DevOps knowledge
- Developer-oriented tooling may not suit non-technical team members
- Ecosystem of third-party integrations is smaller than the market leaders in documentation
Tettra
Strengths
- 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
Weaknesses
- 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
The bottom line
Pricing: Both Outline and Tettra are free. You can try both without spending a dollar.
Feature gaps: Outline offers API, Markdown and Open Source that Tettra lacks. Tettra brings AI Answers, Slack Integration and Templates that Outline does not have.
Team fit: Both tools target small teams teams, so the decision hinges on features and workflow fit rather than scale.
Open source: Outline is open source, meaning you can self-host, audit the code, and avoid vendor lock-in. Tettra is proprietary — you are trusting the vendor with your data and uptime.
Where each tool shines: Outline's biggest strengths are: open source and transparent. open-source codebase gives you full transparency and community-driven development. Tettra's biggest strengths are: includes ai answers as a core feature, purpose-built for documentation workflows. includes slack integration as a core feature, purpose-built for documentation workflows.
Watch out for: With Outline, users commonly note that may lack some advanced features. With Tettra, the main complaint is that free plan exists but key features are locked behind the paid upgrade.
Choose Outline if...
- Your profile matches its sweet spot: teams wanting a fast, beautiful open-source wiki
- You need self-hosting, data sovereignty, or the ability to audit source code
- You specifically need API and Markdown
- You care about open-source codebase gives you full transparency and community-driven development
Choose Tettra if...
- Your profile matches its sweet spot: teams wanting a simple internal knowledge base
- You specifically need AI Answers and Slack Integration
- You care about includes slack integration as a core feature, purpose-built for documentation workflows
- The free tier works for you: free for up to 5 users
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