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ReSmush.it vs Unsplash

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

APIReSmush.itNEW—UnsplashNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesyes
HTTPSnoyes
Card requirednono
Commercial useunclearunclear
Data licenseN/A — optimization service, not a datasetUnverified
Free tierFree; per-image size cap applies (see docs)Free tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

ReSmush.it vs Unsplash: common questions

Which is more reliable, ReSmush.it or Unsplash?

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

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

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

Only Unsplash 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 ReSmush.it and Unsplash free for commercial use?

ReSmush.it has unclear commercial terms, and Unsplash 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.