Best API Testing Tools 2026
by Anonymous
API testing tools allow developers to design, test, and document REST, GraphQL, and gRPC APIs efficiently. Modern tools offer collaboration features, automated test suites, mock servers, and CI/CD integration. The choice between them often comes down to team workflow preferences, pricing model, and whether you need a GUI-first approach or prefer code-driven testing for complex automation scenarios.
Postman
Free for 3 users, Team $14/user/mo
price
REST, GraphQL, gRPC, WebSocket, SOAP
protocol support
Workspaces, version history, comments
collaboration
Yes, built-in
mock server
Yes, Newman CLI
ci/cd integration
Partial, requires account
offline support
Insomnia
Free core, Team $12/user/mo
price
REST, GraphQL, gRPC, WebSocket
protocol support
Git sync, cloud sync
collaboration
No native mock server
mock server
Yes, Inso CLI
ci/cd integration
Yes, local-first
offline support
Hoppscotch
Free, open source (self-host)
price
REST, GraphQL, WebSocket, SSE
protocol support
Teams, shared collections
collaboration
No
mock server
Yes, Hoppscotch CLI
ci/cd integration
Yes, self-hosted or PWA
offline support
Bruno
Free, open source
price
REST, GraphQL
protocol support
Git-based, filesystem collections
collaboration
No
mock server
Yes, Bruno CLI
ci/cd integration
Yes, fully offline
offline support
Thunder Client
Free, Pro $8.99/yr
price
REST, GraphQL
protocol support
Git-based export/import
collaboration
No
mock server
Limited, export to cURL
ci/cd integration
Yes, VS Code extension
offline support
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