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Kanji API vs RhymeBrain

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

APIKanji APINEW—RhymeBrainNEW—
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

Kanji API vs RhymeBrain: common questions

Which is more reliable, Kanji API or RhymeBrain?

On our scheduled checks, RhymeBrain leads on measured uptime — Kanji API at —% versus RhymeBrain 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 Kanji API and RhymeBrain need an API key?

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

Can I call Kanji API and RhymeBrain from the browser?

Yes — both Kanji API and RhymeBrain 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 Kanji API and RhymeBrain free for commercial use?

Kanji API has unclear commercial terms, and RhymeBrain 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.