Best Thunder Client Alternatives
Looking for alternatives to Thunder Client? Whether you need a different pricing model, better features for your use case, or just want to explore your options, we've compared 10 tools similar to Thunder Client. 4 of these alternatives are completely free or open-source, and 10 offer a free tier.
Thunder Client is a freemium tool starting at Free in the API Development space. Each alternative below is rated by our team with detailed feature comparisons, pricing breakdowns, and honest pros and cons. Use the comparison links to see how any alternative stacks up head-to-head.
Last updated: March 2026
Lightweight REST API client built directly into VS Code.
Interactive API documentation that developers actually love.
Free
Instant GraphQL and REST APIs for your databases with built-in security.
Free
Free
Open-source API development ecosystem — lightweight and fast.
Free
The most widely used API documentation and design toolset.
Free
Beautiful API documentation and developer portals from OpenAPI specs.
Free
Open-source API client for REST, GraphQL, gRPC, and WebSocket testing.
Free
Free
Offline-first, git-friendly API client that stores requests in files.
Free
The world's largest API marketplace for discovering and connecting APIs.
Free