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Abstract Email Validation vs User Agent Lookup API

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

APIAbstract Email ValidationREACHABLE—User Agent Lookup APINEW—
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
In directory since2026-07-052026-07-05
operationalpartialdownno data

Abstract Email Validation vs User Agent Lookup API: common questions

Which is more reliable, Abstract Email Validation or User Agent Lookup API?

On our scheduled checks, User Agent Lookup API leads on measured uptime — Abstract Email Validation 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 Abstract Email Validation and User Agent Lookup API need an API key?

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

Can I call Abstract Email Validation and User Agent Lookup API from the browser?

Only Abstract Email Validation 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 Abstract Email Validation and User Agent Lookup API free for commercial use?

Abstract Email Validation 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.