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OCR.Space vs SLA Uptime Calculator

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

APIOCR.SpaceREACHABLE—SLA Uptime CalculatorNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key may be required for productionFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

OCR.Space vs SLA Uptime Calculator: common questions

Which is more reliable, OCR.Space or SLA Uptime Calculator?

On our scheduled checks, SLA Uptime Calculator leads on measured uptime — OCR.Space at —% versus SLA Uptime Calculator 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 OCR.Space and SLA Uptime Calculator need an API key?

SLA Uptime Calculator needs no key, while OCR.Space requires a free API key. If you want to start calling without signup, reach for SLA Uptime Calculator first.

Can I call OCR.Space and SLA Uptime Calculator from the browser?

Yes — both OCR.Space and SLA Uptime Calculator send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

Are OCR.Space and SLA Uptime Calculator free for commercial use?

OCR.Space has unclear commercial terms, and SLA Uptime Calculator 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.