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Abstract API vs Kroki

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

APIAbstract APIHEALTHY89KrokiHEALTHY92
Uptime · 30d
Uptime · 90d99.02%100%
Uptime · 30d98.3%100%
P50 · ms700633
P95 · ms16563183
AuthapiKeynone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key may be required for productionFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Abstract API vs Kroki: common questions

Which is more reliable, Abstract API or Kroki?

On our scheduled checks, Kroki leads on measured uptime — Abstract API at 99.02% versus Kroki at 100% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Which is faster, Abstract API or Kroki?

Kroki has the lower median latency in our checks — Abstract API responds in 700 ms versus Kroki at 633 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.

Do Abstract API and Kroki need an API key?

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

Can I call Abstract API and Kroki from the browser?

Yes — both Abstract API and Kroki 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 Abstract API and Kroki free for commercial use?

Abstract API has unclear commercial terms, and Kroki 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.