Yasumu

Free, open-source API laboratory for designing and testing API workflows.

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Yasumu is a free, open-source API laboratory for designing and testing API workflows, including a built-in catch-all mailbox for testing email and SMTP flows alongside standard requests. It's built for developers who want an all-in-one, non-proprietary alternative to closed API testing tools.

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Full match profile

Behind the summary, Matchbox keeps a richer profile of Yasumu - the signals our matcher actually reads to decide when to surface it. It stays private; claim the listing to see and control it.

Problem & pain-point mapping
Who we surface it to (audience fit)
What it's a strong alternative to
Trust & credibility signals

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