Best email verification services
Email verification services differ on what share of your list sits on catch-all domains, how each one reports the addresses it could not resolve, and whether those results are billed.
How this was compared
Figures read from each vendor's own pages in September 2026. Where a vendor is missing from a column, we could not read it rather than estimating.
The short version
- Published pricing read from each vendor's own page in September 2026, with the date recorded.
- Whether unknown and duplicate results are billed, which changes the effective rate more than the headline does.
- Credit expiry terms, since a twelve-month clock converts an advertised rate into something else.
- What each vendor publishes about accuracy, and whether any denominator is given for it.
- What the product does beyond the SMTP check: catch-all resolution, toxicity scoring, deliverability tooling.
At a glance
| 10,000 addresses | Credit expiry | Bills unknowns | |
|---|---|---|---|
| ZapBounce | Not a verification vendor | ||
| ZeroBounce | Subscription only | Credits roll over while the subscription is active | Not stated |
| Bouncer | $60 | Credits never expire | No |
| Clearout | Not listed | Credits never expire and roll over | Not stated |
| Emailable | About $0.0076 an address with a subscription | Credits never expire | No |
| Reoon | $11.90 | Instant credits never expire | Not stated |
| DeBounce | Tiered from 5,000 to 5,000,000 | Credits never expire | Not stated |
| Hunter | Plans from $49 to $299 a month | Credits expire after 12 months | Not stated |
Vendor figures read from their own pricing pages in September 2026. Confirm before purchase, because prices move.
The ranking
Best first, with the situation each one wins and the situation it loses.
ZapBounce
The only verifier here that reports what it got no answer on as a headline number, and the only one that does not charge you for those addresses. Credits never expire and duplicates in the same upload are free.
- Best for:
- A team that wants to know the shape of its list, including the share nobody can reach a verdict on, before it plans a send.
- Not for:
- A buyer who needs a vendor with references. We have no published benchmark, no reviews and no operating history, and every other row on this page has some of that.
ZeroBounce
The broadest product in the category. Inbox placement testing, blacklist monitoring and DMARC tooling sit alongside the verifier, which matters if you would otherwise buy three products.
- Best for:
- Teams who want deliverability monitoring and verification from one vendor and one invoice.
- Not for:
- Anyone testing a small list, since the entry point is a 2,000-credit minimum rather than a small pay-as-you-go purchase.
Bouncer
The clearest pricing page in the category and the only major vendor that publishes no accuracy percentage at all, which is more honest than most of this market.
- Best for:
- European lists where data handling and privacy posture are part of the procurement question.
- Not for:
- Buyers who want a headline accuracy number to put in a comparison document, because they decline to provide one.
Clearout
They genuinely attempt to resolve catch-all domains rather than reporting them, which is the hardest part of this problem, and they hold ISO and SOC 2 Type II certification.
- Best for:
- B2B lists where catch-all domains are a large share and an inference beats an unresolved result.
- Not for:
- Anyone comparing on price, since their pricing page does not list per-volume rates.
Emailable
The largest free trial in the category at 250 credits, a mature HubSpot integration, and no published accuracy claim, which we credit.
- Best for:
- HubSpot-centred teams who want the integration to be somebody else's problem.
- Not for:
- Small one-off jobs, given the 5,000-credit minimum.
Reoon
The challenger with the strongest reputation among cold-email practitioners for resolving Yahoo, Microsoft and catch-all cases that others return as unknown.
- Best for:
- Cold outreach lists heavy in hard domains, where an inference on a difficult address has real value.
- Not for:
- Buyers who want the resolution method disclosed, since a verdict on a Yahoo address has no protocol basis and the reasoning is not published.
DeBounce
The lowest headline per-check price here, with wide ESP integration coverage and a verified Klaviyo partnership.
- Best for:
- High-volume one-off cleans where per-address price is the deciding factor.
- Not for:
- Predictable budgeting, since catch-all validation and enrichment cost extra credits per address on top of the headline rate.
Hunter
Finding and verifying in one product, and the only vendor in this market to publish a 40,000-verification benchmark measuring the whole field including itself.
- Best for:
- Teams building lists from scratch who need to find addresses as well as check them.
- Not for:
- Bulk list cleaning, where verification is an attachment to a finder rather than the product, and credits expire after twelve months.
Our own first place, and what it does not cover
When none of these is the answer
If your list was collected with confirmed opt-in and mailed last month, none of these will find much. If it is a purchased list, verification tells you the addresses exist and leaves the consent problem and the spam trap risk exactly where they were.
Questions people ask
Why is there no accuracy column in this comparison?
Because the published figures are not comparable. Each is calculated after that vendor's unknown and catch-all results leave the denominator, and Hunter's independent benchmark measured the same field at 63% to 70%.
Why are some vendors missing prices?
NeverBounce, Kickbox and MillionVerifier blocked automated checks or did not publish reachable pricing, so they appear here without figures rather than with numbers sourced from somewhere else.
Which one resolves catch-all domains best?
Clearout, on the strength of their own positioning and certification. No verifier can confirm a mailbox on a catch-all domain through SMTP, so what they offer is a better inference rather than a protocol answer.
Run the same sample through two of them
100 free checks a month, no card. Compare how many addresses each one declined to judge, which matters more than either accuracy claim.