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Abstract Email Validation vs ItsThisForThat

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

APIAbstract Email ValidationREACHABLE—ItsThisForThatNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — 100 requests/monthFree — limits not published
Rate limit100 requests/month on free planUnpublished (docs ask you not to hammer it)
In directory since2026-07-052026-07-05
operationalpartialdownno data

Abstract Email Validation vs ItsThisForThat: common questions

Which is more reliable, Abstract Email Validation or ItsThisForThat?

On our scheduled checks, ItsThisForThat leads on measured uptime — Abstract Email Validation at —% versus ItsThisForThat 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 ItsThisForThat need an API key?

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

Can I call Abstract Email Validation and ItsThisForThat from the browser?

Only Abstract Email Validation is browser-friendly — it returns CORS headers over HTTPS. ItsThisForThat needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Abstract Email Validation and ItsThisForThat free for commercial use?

Abstract Email Validation has unclear commercial terms, and ItsThisForThat 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.