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API Tester vs API Flow: catalog facts
API Tester	API Flow
Freemium Cost details are not described on the fetched page; check the app store listings.	Free Free and open source under the MIT license.
Android, iOS	Android
Supports REST, SOAP, GraphQL and WebSocket on mobile Imports curl, OpenAPI and Postman collections	Supports common HTTP methods Inspects response status, timing, and body
Mobile only, no desktop version Small screens make large requests harder to edit	Android-only Response body viewing has a 1 MiB safety cap
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: MIT
Not stated if an account is needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 8, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.