MillionVerifier alternative: OS Tools head-to-head
Here's a clear, no-fluff comparison between MillionVerifier and OS Tools — pricing model, credit expiry, catch-all handling, and what's included beyond email verification — so you can decide in five minutes.
Why teams pick OS Tools over MillionVerifier
MillionVerifier is one of the better-priced single-purpose email verifiers — if all you need is the cheapest yes/no on an email, it's a reasonable pick. The trade-off is that it really only does that one job. Anything past verification (researching a lead, checking a website, validating a phone, finding the right contact at a company) needs a different tool and another bill.
OS Tools is built the opposite way: one credit balance covers email verification, catch-all rescue, MX / SPF / DKIM / DMARC checks, website scraping, phone validation, and owner discovery. The 200 free credits at signup are enough to verify a real sample list AND test the other tools before deciding.
On the verification itself, the differences come down to two things. First, catch-all handling: MillionVerifier flags catch-alls as 'unknown' and gives the credit back, but the address stays unverified. OS Tools' Verify Plus pushes those addresses through a second provider automatically — so a meaningful chunk that would have been 'unknown' on MillionVerifier comes back as a confident result. Second, credits at OS Tools don't expire; MillionVerifier credits do after 12 months.
Try the bulk verifier free with 200 credits
Sign up, get 200 verifications on the house, and see the result quality for yourself. No subscription, no commitment — pay per credit only when you need more.
Frequently asked questions
Is OS Tools cheaper than MillionVerifier?
MillionVerifier is competitive on raw per-email price at high volumes. OS Tools' practical cost ends up similar or lower for most users because (a) catch-all rescue means fewer wasted credits on unknown results, (b) the same credits also cover phone verification, website analysis, and owner discovery, and (c) credits never expire — MillionVerifier credits expire after 12 months.
Is the verification accuracy the same?
On clean, non-catch-all mailboxes, accuracy is effectively tied — both tools use the same SMTP-level signals. The accuracy gap shows up on catch-alls and risky addresses. MillionVerifier returns 'unknown' and refunds the credit. OS Tools' Verify Plus reruns the address through a secondary provider (ZeroBounce) automatically, recovering a meaningful share of those addresses as confident 'valid' or 'invalid'.
Can I import the same CSV I'd use for MillionVerifier?
Yes. Drop a CSV with up to 10,000 rows. We keep every original column intact and append the verification result alongside, so the output drops straight back into your CRM or outreach tool with no re-mapping. MillionVerifier produces a result file that doesn't always preserve original column order.
Do you offer an API like MillionVerifier?
Not today. OS Tools is a web app focused on CSV bulk workflows and on-demand checks. If you need a programmatic real-time API for inline form validation, MillionVerifier is the stronger choice right now. We'll ship an API when we can do it well, not just to tick a box.
How long do my credits last?
OS Tools credits never expire — once purchased they sit in your account until you use them. MillionVerifier credits expire after 12 months.
Can I try it without paying?
Yes. Use the 5 free utility tools (MX lookup, DNS health check, email syntax checker, disposable detector, email extractor) with no signup. For bulk verification, signing up gives you 200 free credits — enough to run a real list and compare results to MillionVerifier side by side.
Comparison based on public information from MillionVerifier and our own product. We update this page as either product changes; spot an inaccuracy? Email help@os-tools.com.