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ReSmush.it vs xColors

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

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

ReSmush.it vs xColors: common questions

Which is more reliable, ReSmush.it or xColors?

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

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

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

Only xColors 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 xColors free for commercial use?

ReSmush.it has unclear commercial terms, and xColors 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.