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SLA Uptime Calculator vs VATlayer

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

APISLA Uptime CalculatorHEALTHY82VATlayerHEALTHY93
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms1373473
P95 · ms27412118
AuthnoneapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — key may be required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

SLA Uptime Calculator vs VATlayer: common questions

Which is more reliable, SLA Uptime Calculator or VATlayer?

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

VATlayer has the lower median latency in our checks — SLA Uptime Calculator responds in 1373 ms versus VATlayer at 473 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 SLA Uptime Calculator and VATlayer need an API key?

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

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

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

Are SLA Uptime Calculator and VATlayer free for commercial use?

SLA Uptime Calculator has unclear commercial terms, and VATlayer 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.