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Genius vs ReSmush.it

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

APIGeniusNEW—ReSmush.itNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSyesyes
HTTPSyesno
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedN/A — optimization service, not a dataset
Free tierFree tier — API key requiredFree; per-image size cap applies (see docs)
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Genius vs ReSmush.it: common questions

Which is more reliable, Genius or ReSmush.it?

On our scheduled checks, ReSmush.it leads on measured uptime — Genius at —% versus ReSmush.it 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 Genius and ReSmush.it need an API key?

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

Can I call Genius and ReSmush.it from the browser?

Only Genius is browser-friendly — it returns CORS headers over HTTPS. ReSmush.it needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Genius and ReSmush.it free for commercial use?

Genius has unclear commercial terms, and ReSmush.it 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.