Best email verification services
Email verification services differ on how they report the addresses they could not resolve, whether those results are billed, and how they treat catch-all domains.
How this was compared
Disclosure: ZapBounce is our product. Figures were read from each vendor's own pages in September 2026, and the criteria below were applied to every entry, ours included.
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 turns an advertised rate into a higher one.
- What each vendor publishes about accuracy, and whether a denominator comes with it.
- What the product does beyond the SMTP check: catch-all handling, toxicity scoring, deliverability tooling.
At a glance
| 10,000 addresses | Credit expiry | Bills unknowns | |
|---|---|---|---|
| ZapBounce | $25 | Credits never expire | No |
| 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 | No |
| Emailable | $0.0076 an address at the 5,000 entry, 15% off on 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 | No |
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 fits.
ZapBounce
Reports the share of your list that got a definite verdict as a headline number, and never charges for the addresses a server would not answer on. Credits never expire, duplicates in the same upload are free, and the entry is $5 for 1,000 with no minimum.
- Best for:
- A team that wants to see the real shape of its list before it plans a send, including the share nobody can reach a verdict on. The check is our own SMTP handshake on port 25, closed before DATA, so no message reaches anyone (how it works).
ZeroBounce
Inbox placement testing, blacklist monitoring and DMARC tooling sit alongside the verifier, with activity data on top.
- Best for:
- Teams who want deliverability monitoring and verification from one vendor on one invoice.
- Less suited to:
- A small test list, since the entry is $39 for a 2,000-credit minimum (read September 2026).
Bouncer
Prices on one readable page, credits that never expire, and no charge for duplicates or unknowns. Bouncer publishes no accuracy percentage.
- Best for:
- European lists where data handling is part of the procurement question.
- Less suited to:
- A procurement file that asks for a vendor accuracy figure, since Bouncer publishes none.
Clearout
Clearout attempts to resolve catch-all domains with an inference, and it holds ISO and SOC 2 Type II certification.
- Best for:
- B2B lists where catch-all domains are a large share and the buyer wants an inferred verdict on them.
- Less suited to:
- Comparing on price, since their pricing page does not list per-volume rates.
Emailable
250 free credits once, a HubSpot marketplace app, and refunds for duplicates and unknowns. Emailable publishes no accuracy claim.
- Best for:
- HubSpot-centred teams who want the connector maintained by the vendor.
- Less suited to:
- Jobs under 5,000 addresses, which is the minimum purchase.
Reoon
A five-step deep check that returns a 0 to 100 score, and a reputation for resolving Yahoo and catch-all cases as a scored inference.
- Best for:
- Cold outreach lists heavy in hard domains, where a scored inference on a difficult address is useful.
- Less suited to:
- Buyers who want a protocol answer on every address, since Yahoo accepts every probe by policy and any verdict there is an inference.
DeBounce
Tiered pricing from 5,000 up to 5,000,000 addresses, from $0.00045 a check, with credits that never expire.
- Best for:
- Very large one-off cleans on consumer lists, where the catch-all share is small.
- Less suited to:
- Predictable budgeting, since catch-all validation and enrichment cost extra credits per address.
Hunter
Finding and verifying in one product, and the publisher of a benchmark that measured 15 verifiers, itself included, on 3,000 real business addresses (3 November 2025).
- Best for:
- Teams building lists from scratch who need to find addresses as well as check them.
- Less suited to:
- Bulk list cleaning, since verification rides on a finder's plan and credits expire after twelve months.
Why ZapBounce ranks first
How to choose
- Catch-all share. Roughly 28% of a 10,000-address B2B benchmark sat on accept-all domains. Clearout offers an inference there. ZapBounce probes a random address at the same domain and returns
catch_all, so you decide how to send (catch-all handling). - Billing for unknowns. Bouncer, Kickbox and Emailable don't bill them, and ZeroBounce's pricing page leaves it unstated (September 2026). ZapBounce never bills an unknown or a duplicate (which verifiers charge for unknowns).
- Credit expiry. Kickbox credits expire one year from purchase and Hunter's after twelve months (read September 2026). ZapBounce credits never expire (do credits expire?).
- Entry size. ZeroBounce starts at $39 for 2,000 credits and Emailable at a 5,000-credit minimum. You can start on ZapBounce at $5 for 1,000, or free with 100 checks a month.
- Head to head. Our ZapBounce vs ZeroBounce page lines up both products on one list, and every ranking is on the hub.
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 benchmark of 15 verifiers on 3,000 real business addresses measured the field at 31.2% to 70.0% (3 November 2025).
Why are some vendors missing prices?
Every price here was read on the vendor's own pricing page in September 2026. A vendor that gates its prices behind a login or a sales call, such as NeverBounce or BriteVerify, is shown by plan structure only, with no figure.
Why is NeverBounce not ranked here?
NeverBounce's pricing page could not be read on its own site in September 2026, and every ranked entry needs a dated source. It appears on our comparison pages by plan structure only.
Can any verifier here confirm a mailbox on a catch-all domain?
No. A catch-all domain answers 250 to every recipient, so no SMTP check can confirm a mailbox on it. Some vendors offer an inference. ZapBounce probes a random address at the same domain. When that is accepted too, the result is catch_all, so you see the segment and decide how to send to it.
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.