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MediaCaption API vs ReSmush.it

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

APIMediaCaption APIDOCS OK100ReSmush.itNEW91
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms1062666
P95 · ms10621462
AuthapiKeynone
CORSyesyes
HTTPSyesno
Card requirednono
Commercial useyesunclear
Data licenseN/A — optimization service, not a dataset
Free tier10 credits when you sign upFree; per-image size cap applies (see docs)
Rate limit60 req/minUnpublished
In directory since2026-07-182026-07-05
operationalpartialdownno data

MediaCaption API vs ReSmush.it: common questions

Which is more reliable, MediaCaption API or ReSmush.it?

Both are neck-and-neck — MediaCaption API and ReSmush.it each measure 100% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

Which is faster, MediaCaption API or ReSmush.it?

ReSmush.it has the lower median latency in our checks — MediaCaption API responds in 1062 ms versus ReSmush.it at 666 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.

Do MediaCaption API and ReSmush.it need an API key?

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

Can I call MediaCaption API and ReSmush.it from the browser?

Only MediaCaption API 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 MediaCaption API and ReSmush.it free for commercial use?

MediaCaption API allows commercial use on its free tier, 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.