Best Open Source Alternatives to Testfully

Compare the best free and open-source alternatives to Testfully — self-hosted and desktop replacements you fully control, ranked by GitHub stars, license and platform support.

Curated by open-source.store · Updated November 2026 · 7 alternatives

Testfully

Proprietary SaaS

Testfully alternatives compared

Open-source alternatives to Testfully, compared by stars, license and platform
Tool		License	Platforms	Self-hosted
Insomnia	40,110	Apache-2.0	LinuxmacOSWindows	No	Nov 2026	Visit
Yaak	19,402	MIT	LinuxmacOSWindows	No	Nov 2026	Visit
Scalar	16,364	MIT	DockerLinuxmacOSWindows	Yes	Nov 2026	Visit
Mockoon	8,467	MIT	LinuxmacOSWindows	No	Nov 2026	Visit
Requestly	6,760	—	DockerLinux	Yes	Nov 2026	Visit
HTTPie	4,057	BSD-3-Clause		No	Mar 2025	Visit
Voiden	2,016	Apache-2.0	LinuxmacOSWindows	No	Nov 2026	Visit

Top open-source Testfully alternatives

Insomnia40,110Apache-2.0

Insomnia is an open-source API client replacing Postman with faster multi-protocol debugging, Git-based collection syncing, and local-first data privacy.

LinuxmacOSWindows

vs Testfully: a free, open-source option you fully control, licensed Apache-2.0.

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Yaak19,402MIT

Yaak is an open-source desktop API client alternative to Postman, offering local-first REST, GraphQL, and gRPC workflows with native Git sync.

LinuxmacOSWindows

vs Testfully: a free, open-source option you fully control, licensed MIT.

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Scalar16,364MIT

Open-source offline-first API platform and Postman alternative that turns OpenAPI specs into interactive documentation and local request runners.

DockerLinuxmacOSWindows

vs Testfully: a free, open-source option you fully control, licensed MIT.

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Mockoon8,467MIT

Mockoon is a local-first mock API server that replaces cloud dependencies with an offline desktop GUI, headless CLI, and zero account requirements.

LinuxmacOSWindows

vs Testfully: a free, open-source option you fully control, licensed MIT.

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Requestly6,760

Requestly is a local-first Postman alternative for testing REST, GraphQL, and gRPC APIs with Git-based collection sync and zero mandatory cloud login.

DockerLinux

vs Testfully: a free, open-source option you fully control.

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Best Open Source Alternatives to Testfully

Testfully

Testfully alternatives compared

Top open-source Testfully alternatives

The modern standard for Protobuf workflows

Mentoring for backend developers. Consulting for startups.

More alternatives to Testfully

HTTPie

Voiden