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MailboxValidator Free Email Checker vs QR & Barcode

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

APIMailboxValidator Free Email CheckerHEALTHY94QR & BarcodeHEALTHY91
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms527722
P95 · ms11381344
AuthapiKeynone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

MailboxValidator Free Email Checker vs QR & Barcode: common questions

Which is more reliable, MailboxValidator Free Email Checker or QR & Barcode?

Both are neck-and-neck — MailboxValidator Free Email Checker and QR & Barcode each measure 100% 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, MailboxValidator Free Email Checker or QR & Barcode?

MailboxValidator Free Email Checker has the lower median latency in our checks — MailboxValidator Free Email Checker responds in 527 ms versus QR & Barcode at 722 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 MailboxValidator Free Email Checker and QR & Barcode need an API key?

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

Can I call MailboxValidator Free Email Checker and QR & Barcode from the browser?

Only QR & Barcode 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 MailboxValidator Free Email Checker and QR & Barcode free for commercial use?

MailboxValidator Free Email Checker has unclear commercial terms, and QR & Barcode 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.