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SLA Uptime Calculator vs User Agent Lookup API

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

APISLA Uptime CalculatorNEW—User Agent Lookup APINEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

SLA Uptime Calculator vs User Agent Lookup API: common questions

Which is more reliable, SLA Uptime Calculator or User Agent Lookup API?

On our scheduled checks, User Agent Lookup API leads on measured uptime — SLA Uptime Calculator at —% versus User Agent Lookup API 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 SLA Uptime Calculator and User Agent Lookup API need an API key?

Neither needs a paid key — SLA Uptime Calculator is callable with no signup, and User Agent Lookup API is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call SLA Uptime Calculator and User Agent Lookup API from the browser?

Only SLA Uptime Calculator is browser-friendly — it returns CORS headers over HTTPS. User Agent Lookup API needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are SLA Uptime Calculator and User Agent Lookup API free for commercial use?

SLA Uptime Calculator has unclear commercial terms, and User Agent Lookup API 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.