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API Flow vs API Tester: catalog facts
API Flow	API Tester
Best for: Developers who need to test HTTP APIs from an Android device	Best for: Developers who need to test APIs from a phone
Free Free and open source under the MIT license.	Free + paid options
Android	Android, iOS
Supports common HTTP methods Inspects response status, timing, and body All 3 strengths for API Flow Supports common HTTP methods Inspects response status, timing, and body Stores request collections and history locally	Supports REST, SOAP, GraphQL and WebSocket on mobile Imports curl, OpenAPI and Postman collections All 4 strengths for API Tester Supports REST, SOAP, GraphQL and WebSocket on mobile Imports curl, OpenAPI and Postman collections Runs Python and JavaScript scripts on the device Apple Watch, Shortcuts and widget integration
Android-only Response body viewing has a 1 MiB safety cap	Mobile only, no desktop version Small screens make large requests harder to edit
Downloadable app	Downloadable app
Open source	Not open source
License: MIT	License not stated
No account needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Sources for API Flow github.com/jeffin-v/api_flow Catalog checked October 8, 2026	Official website Full listing and sources Sources for API Tester tester.io Catalog checked October 2, 2026

“Not stated” means we have not confirmed it. Features can vary by device and plan.