API Fortress Alternatives

HttpMaster is a professional software tool for testing and debugging HTTP applications, primarily aimed at REST API applications and web services.

freemium

Open source API development ecosystem

Open Source freemium

Flagsmith lets you manage feature flags and remote config across web, mobile and server side applications. Deliver true Continuous Integration. Get builds out faster. Control who has access to new features. We're Open Source.

Try for free Open Source freemium

Easy mocking of any system you integrate with via HTTP or HTTPS.

Open Source

Debug web hooks, http clients

Assertible software provides you with a simple and quick way to monitor your web services. It comes with automated QA tools that users can utilize to test and monitor their web services on different platforms and environments.

API Traffic Inspector

Bearer is an open source, fast and accurate static application security testing (SAST) tool that analyze your source code to discover, filter and prioritize security and privacy risks.

Open Source freemium

Crosscheck Networks designed SOAPSonar from the ground-up as a comprehensive testing solution with...

Inspect and debug HTTP requests

API testing tool. Which allows web developers to create and test custom HTTP requests.

Instantly generate a free, unique URL and email address to test, inspect, and automate (with a visual workflow editor and scripts) incoming HTTP requests and emails.

Open Source freemium $14.0 / Monthly

intercept.rest is a tool which helps to debug and mock REST APIs

The Collaboration Platform for API Development

Open Source