Email verifiers for Apollo and ZoomInfo lists
A provider's verified flag records what its check found the day it ran. Seven verifiers ranked for re-checking an Apollo or ZoomInfo export before a send.
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
- Whether the check runs live against the receiving mail server on the day you send, rather than reading a stored status.
- How catch-all business domains are reported, since provider exports are mostly work addresses.
- Whether duplicate rows, common when exports from several searches are merged, are billed.
- Whether the vendor's terms accept lists sourced from a data provider.
- Published price at 10,000 addresses and credit expiry, read from each vendor's own pages in September 2026.
- Disclosure: ZapBounce is our product, and the same criteria were applied to it.
At a glance
| 10,000 addresses | Credit expiry | Bills unknowns | |
|---|---|---|---|
| ZapBounce | $25 | Credits never expire | No |
| NeverBounce | See their pricing page | See their pricing page | See their pricing page |
| Hunter | Plans from $49 to $299 a month | Credits expire after 12 months | No |
| Reoon | $11.90 | Instant credits never expire | Not stated |
| Bouncer | $60 | Credits never expire | No |
| Kickbox | $70 | Credits expire one year from purchase | No |
| ZeroBounce | Subscription only | Credits roll over while the subscription is active | 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 fits.
ZapBounce
Disclosure: ZapBounce is our product. You upload the export as a CSV and get it back with your original columns plus a result for every row: valid, invalid, catch_all or unknown. Duplicates across merged exports are checked once and billed once, and unknown rows cost nothing.
- Best for:
- Sales teams re-checking a provider export in the week they send, at $25 for 10,000 checks, with a role flag that marks info@ and sales@ rows before they reach a sequence.
NeverBounce
NeverBounce belongs to ZoomInfo, so verification sits inside a B2B data relationship that also sells contacts and enrichment. Its pricing page blocked automated reading, so this row carries no figures.
- Best for:
- Teams that already buy ZoomInfo data and want verification from the same owner.
- Less suited to:
- Buyers who want to read a price ladder before signing up, since their pricing page would not load for us.
Hunter
Hunter is an email finder first, with verification at half a credit, and it published a benchmark of 15 verifiers on 3,000 real business addresses.
- Best for:
- Teams that find addresses and verify them in one tool.
- Less suited to:
- Stocking up on credits, since Hunter credits expire after 12 months.
Reoon
Reoon runs a five-step deep check and returns a 0 to 100 score, and cold-email forums name it often for hard business domains.
- Best for:
- Outbound teams who set their own score threshold for sending.
- Less suited to:
- Teams who want a fixed label per row, since a score needs a cut-off someone has to pick.
Bouncer
Bouncer never charges for duplicates or unknowns and adds a toxicity check for risky domains.
- Best for:
- Merged exports with a lot of overlap, where free duplicates keep the bill down.
- Less suited to:
- Large monthly exports on a tight budget, where their 100,000 tier is $400.
Kickbox
Kickbox charges for definitive results, refunds unknowns and adds a Sendex quality score to each address.
- Best for:
- Teams that want a quality score alongside the SMTP result.
- Less suited to:
- Lists bought from a data vendor, which Kickbox's terms prohibit, and credits expire one year from purchase.
ZeroBounce
ZeroBounce pairs verification with activity data that can show whether an address engaged recently.
- Best for:
- Teams who want an engagement signal next to the deliverability result.
- Less suited to:
- Small tests, given the 2,000-credit entry minimum.
Why ZapBounce ranks first
When none of these is the answer
Decide on three things. How old is the export: a list pulled this week needs a lighter pass than one sitting in a spreadsheet since last quarter. How much overlap it carries: merged searches repeat people, so a vendor that bills duplicates charges you twice. How your sequencer reads the result: a fixed label per row imports cleanly as a filter, while a score needs a threshold set first.
Questions people ask
Does Apollo verify emails well enough on its own?
A provider's verified status reflects the check it ran on the day it ran it. A live re-check before you send catches addresses that stopped working since then. ZapBounce re-checks an export for $25 per 10,000 addresses and never bills unknown rows.
Why do Apollo and ZoomInfo lists still bounce?
People leave jobs and companies change mail servers after the provider's check. About 28% of a 10,000-address B2B benchmark also sat on catch-all domains, which no SMTP check can confirm at mailbox level.
Can I verify a list I bought from a data provider?
Yes, on ZapBounce, as long as you hold a lawful basis to process every address. Verification checks deliverability only and never creates consent to email anyone.
Should I remove catch-all rows from a ZoomInfo export?
Keep them in a separate segment and send to them after your valid rows, in smaller batches. Many are real buyers at companies whose servers accept everything.
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.