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Kroki vs Userstack

Same instrument, two spec sheets — measured, not claimed.

APIKrokiNEW—UserstackNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Kroki vs Userstack: common questions

Which is more reliable, Kroki or Userstack?

On our scheduled checks, Userstack leads on measured uptime — Kroki at —% versus Userstack at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Do Kroki and Userstack need an API key?

Kroki needs no key, while Userstack requires a free API key. If you want to start calling without signup, reach for Kroki first.

Can I call Kroki and Userstack from the browser?

Yes — both Kroki and Userstack send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

Are Kroki and Userstack free for commercial use?

Kroki has unclear commercial terms, and Userstack has unclear commercial terms. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.