Best API Documentation Software for Small Business

4 API documentation tools ranked by verified entry price, cheapest first. Every price comes from the company’s official pricing page (latest check October 12, 2026). The lowest listed price is Stoplight Basic at $44 per month.

1. Stoplight Basic

   Basic: $44 per month · billed annually

   Best for: Individuals designing and documenting an API with OpenAPI tooling.

   See Stoplight Basic pricing

   • Stoplight vs DeveloperHub
   • Stoplight vs ReadMe
   • Stoplight vs Theneo

2. DeveloperHub Plus

   Plus: $99 per month · billed annually

   Best for: Small teams hosting API docs on their own domain with an AI agent.

   See DeveloperHub Plus pricing

   • Stoplight vs DeveloperHub
   • DeveloperHub vs ReadMe
   • DeveloperHub vs Theneo

3. Theneo Business

   Business: $120 per workspace/month · billed annually

   Best for: Teams generating AI-assisted API docs with analytics and feedback.

   See Theneo Business pricing

   • Theneo vs ReadMe
   • DeveloperHub vs Theneo
   • Stoplight vs Theneo

4. ReadMe Pro

   Pro: $250 per month · billed annually

   Best for: API teams publishing interactive developer hubs with analytics.

   See ReadMe Pro pricing · ReadMe Pro alternatives

   • DeveloperHub vs ReadMe
   • Stoplight vs ReadMe
   • Theneo vs ReadMe

Ranking is by the entry price we verified, not by features or commissions. Units differ between some tools (per user vs per account), so check the unit line under each price. Higher plans are available for every tool.