Best API Tools Tools in 2026

We've reviewed and ranked the top api tools tools based on features, pricing, user ratings, and our hands-on testing.

Postman Editor's Choice

API platform for building and testing APIs

⭐ 4.6/5

Visit Postman → Free / $14-$49/user/mo

Beautiful documentation for developer products

⭐ 4.6/5

Visit Mintlify → Free / $150-$500/mo

API mocking for browser and Node.js

⭐ 4.6/5

Visit Mock Service Worker → Free

Beautiful, personalized API documentation

⭐ 4.5/5

Visit ReadMe → $99-$399/mo

API documentation and design tools

⭐ 4.5/5

Visit Swagger / OpenAPI → Free / Custom

Open-source API development ecosystem

⭐ 4.5/5

Visit Hoppscotch → Free / $9-$19/user/mo

Human-friendly HTTP client for API testing

⭐ 4.5/5

Visit HTTPie → Free / $20+/mo

Secure tunnels for local development

⭐ 4.5/5

Visit ngrok → Free / $8-$25/mo

Interactive HTTPS proxy for debugging

⭐ 4.5/5

Visit mitmproxy → Free

Open-source API client for REST, GraphQL, and gRPC

⭐ 4.4/5

Visit Insomnia → Free / $5-$12/user/mo