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Numverify vs SLA Uptime Calculator

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

APINumverifyHEALTHY93SLA Uptime CalculatorHEALTHY82
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms4491373
P95 · ms14882741
AuthapiKeynone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — key may be requiredFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Numverify vs SLA Uptime Calculator: common questions

Which is more reliable, Numverify or SLA Uptime Calculator?

Both are neck-and-neck — Numverify and SLA Uptime Calculator 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, Numverify or SLA Uptime Calculator?

Numverify has the lower median latency in our checks — Numverify responds in 449 ms versus SLA Uptime Calculator at 1373 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 Numverify and SLA Uptime Calculator need an API key?

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

Can I call Numverify and SLA Uptime Calculator from the browser?

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

Are Numverify and SLA Uptime Calculator free for commercial use?

Numverify 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.