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Amanah Sunnah vs Crossref Metadata Search

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

APIAmanah SunnahNEW—Crossref Metadata SearchNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearyes
Data licenseUnverifiedOpen Crossref metadata (much is CC0)
Free tierFree tier — API key requiredFree, no key (public pool)
Rate limitUnpublished5 requests/second, 1 concurrent (public pool, per X-Rate-Limit headers)
In directory since2026-07-052026-07-05
operationalpartialdownno data

Amanah Sunnah vs Crossref Metadata Search: common questions

Which is more reliable, Amanah Sunnah or Crossref Metadata Search?

On our scheduled checks, Crossref Metadata Search leads on measured uptime — Amanah Sunnah at —% versus Crossref Metadata Search 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 Amanah Sunnah and Crossref Metadata Search need an API key?

Crossref Metadata Search needs no key, while Amanah Sunnah requires a free API key. If you want to start calling without signup, reach for Crossref Metadata Search first.

Can I call Amanah Sunnah and Crossref Metadata Search from the browser?

Yes — both Amanah Sunnah and Crossref Metadata Search 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 Amanah Sunnah and Crossref Metadata Search free for commercial use?

Amanah Sunnah has unclear commercial terms, and Crossref Metadata Search allows commercial use on its free tier. 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.