Best Open Source API Platform

Hoppscotch Logo

Hoppscotch

An open-source alternative for API development.

★ 77,754 Updated: Jan 2026 Status: Slowing
Insomnia Logo

Insomnia

Intuitive, multi-protocol API client for developers.

★ 37,888 Updated: Feb 2026 Status: Slowing
Karate Logo

Karate

Unified framework for all testing needs

★ 8,776 Updated: Jan 2026 Status: Slowing
Fusio Logo

Fusio

Open-source API management platform

★ 2,072 Updated: Feb 2026 Status: Slowing
Milkman Logo

Milkman

Extensible request workbench for developers

★ 1,323 Updated: Dec 2025 Status: Slowing