Open Source Alternatives to Postman
Hoppscotch
An open-source alternative for API development.
★ 80,635 Updated: Oct 2026 Status: Active
Insomnia
Intuitive, multi-protocol API client for developers.
★ 40,048 Updated: Oct 2026 Status: Active
MailHog
Catch outgoing emails and inspect them in a web UI
★ 16,185 Updated: Feb 2024 Status: Inactive
Karate
Unified framework for all testing needs
★ 8,984 Updated: Oct 2026 Status: Active
Webhook.site
Instant URLs for testing webhooks and HTTP requests
★ 6,775 Updated: Sep 2026 Status: Active
Milkman
Extensible request workbench for developers
★ 1,342 Updated: Sep 2026 Status: Active