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Abstract Email Validation vs Zube

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

APIAbstract Email ValidationDEAD0ZubeDEAD0
Uptime · 30d
Uptime · 90d0.0%0.0%
Uptime · 30d0.0%0.0%
P50 · ms——
P95 · ms——
AuthapiKeyapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — 100 requests/monthFree tier — API key required
Rate limit100 requests/month on free planUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Abstract Email Validation vs Zube: common questions

Which is more reliable, Abstract Email Validation or Zube?

Both are neck-and-neck — Abstract Email Validation and Zube each measure 0.0% 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.

Do Abstract Email Validation and Zube need an API key?

Both ask you to authenticate — Abstract Email Validation uses an API key and Zube uses an API key. Each key is free to obtain; the Auth and Card-required rows above spell out the signup terms.

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

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

Are Abstract Email Validation and Zube free for commercial use?

Abstract Email Validation has unclear commercial terms, and Zube 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.