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Abstract Email Validation vs SLA Uptime Calculator

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

APIAbstract Email ValidationREACHABLE—SLA Uptime CalculatorNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — 100 requests/monthFree — limits not published
Rate limit100 requests/month on free planUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Abstract Email Validation vs SLA Uptime Calculator: common questions

Which is more reliable, Abstract Email Validation or SLA Uptime Calculator?

On our scheduled checks, SLA Uptime Calculator leads on measured uptime — Abstract Email Validation 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 Abstract Email Validation and SLA Uptime Calculator need an API key?

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

Can I call Abstract Email Validation and SLA Uptime Calculator from the browser?

Yes — both Abstract Email Validation 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 Abstract Email Validation and SLA Uptime Calculator free for commercial use?

Abstract Email Validation 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.