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Demon Slayer API vs Kitsu

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

APIDemon Slayer APINEW—KitsuNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Demon Slayer API vs Kitsu: common questions

Which is more reliable, Demon Slayer API or Kitsu?

On our scheduled checks, Kitsu leads on measured uptime — Demon Slayer API at —% versus Kitsu 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 Demon Slayer API and Kitsu need an API key?

Neither needs a paid key — Demon Slayer API is callable with no signup, and Kitsu is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Demon Slayer API and Kitsu from the browser?

Yes — both Demon Slayer API and Kitsu 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 Demon Slayer API and Kitsu free for commercial use?

Demon Slayer API has unclear commercial terms, and Kitsu 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.