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GitHub Project Issues vs MailboxValidator Free Email Checker

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

APIGitHub Project IssuesHEALTHY95MailboxValidator Free Email CheckerHEALTHY96
Uptime · 30d
Uptime · 90d99.44%99.44%
Uptime · 30d100%98.3%
P50 · ms326248
P95 · ms15391138
AuthnoneapiKey
CORSnono
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

GitHub Project Issues vs MailboxValidator Free Email Checker: common questions

Which is more reliable, GitHub Project Issues or MailboxValidator Free Email Checker?

Both are neck-and-neck — GitHub Project Issues and MailboxValidator Free Email Checker each measure 99.44% 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.

Which is faster, GitHub Project Issues or MailboxValidator Free Email Checker?

MailboxValidator Free Email Checker has the lower median latency in our checks — GitHub Project Issues responds in 326 ms versus MailboxValidator Free Email Checker at 248 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 GitHub Project Issues and MailboxValidator Free Email Checker need an API key?

GitHub Project Issues needs no key, while MailboxValidator Free Email Checker requires a free API key. If you want to start calling without signup, reach for GitHub Project Issues first.

Can I call GitHub Project Issues and MailboxValidator Free Email Checker from the browser?

Neither sends browser-friendly CORS headers reliably, so call GitHub Project Issues and MailboxValidator Free Email Checker from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

Are GitHub Project Issues and MailboxValidator Free Email Checker free for commercial use?

GitHub Project Issues 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.