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ReSmush.it vs Sirv

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

APIReSmush.itNEW—SirvNEW—
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 Sirv: common questions

Which is more reliable, ReSmush.it or Sirv?

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

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

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

Only Sirv 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 Sirv free for commercial use?

ReSmush.it has unclear commercial terms, and Sirv 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.