API documentation tools help create interactive, developer-friendly docs that improve API adoption. The best API doc platforms in 2025 auto-generate references from code and provide try-it-now functionality.
🏆 Top API Documentation Tools
1. ReadMe - Best Complete Platform
Price: $99/month
Features: Developer hub, API explorer, metrics, support
2. Swagger UI - Best Open Source
Price: Free
Features: OpenAPI spec, try-it functionality, code generation
3. Postman - Best for Testing + Docs
Price: Free / $12/user/month
Features: Auto-generate from collections, public workspaces
🎁 Final Recommendation
Choose ReadMe ($99/month) for complete developer portal with support and analytics. Choose Swagger UI (free) for open-source OpenAPI documentation. Choose Postman (free or $12/user/month) for combined testing and documentation workflow.