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GeoScore vs MailboxValidator Free Email Checker

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

APIGeoScoreHEALTHY50MailboxValidator Free Email CheckerHEALTHY94
Uptime · 30d
Uptime · 90d51.0%100%
Uptime · 30d81.7%100%
P50 · ms4141527
P95 · ms49841138
AuthapiKeyapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

GeoScore vs MailboxValidator Free Email Checker: common questions

Which is more reliable, GeoScore or MailboxValidator Free Email Checker?

On our scheduled checks, MailboxValidator Free Email Checker leads on measured uptime — GeoScore at 51.0% versus MailboxValidator Free Email Checker at 100% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Which is faster, GeoScore or MailboxValidator Free Email Checker?

MailboxValidator Free Email Checker has the lower median latency in our checks — GeoScore responds in 4141 ms versus MailboxValidator Free Email Checker at 527 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 GeoScore and MailboxValidator Free Email Checker need an API key?

Both ask you to authenticate — GeoScore uses an API key and MailboxValidator Free Email Checker 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 GeoScore and MailboxValidator Free Email Checker from the browser?

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

Are GeoScore and MailboxValidator Free Email Checker free for commercial use?

GeoScore has unclear commercial terms, and MailboxValidator Free Email Checker 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.