TL;DR
- There is no neutral accuracy ranking, so choose on price, terms and your own test results.
- Lowest published price among established names: Mail Exchange. Best for steady high volume: NeverBounce's Growth plan. Broadest suite: ZeroBounce.
- Best terms matched with mid pricing: Emailable. Pay-as-you-go simplicity and compliance: Kickbox.
- We make Mail Exchange, so we've kept every claim to published facts and stated where others win.
The list at a glance
| Service | 5K | 100K | Free start | Best for |
|---|---|---|---|---|
| Mail Exchange | $29 | $299 | 3-day trial, 25 checks | Lowest price, cold email, credits that never expire |
| Emailable | $38 | $420 | 250 credits | Predictable terms, SOC 2 Type II |
| NeverBounce | $40 | $400 | Free test credits | Steady high monthly volume (Growth plan) |
| Kickbox | $40 | $500 | 100 credits | Simple pay-as-you-go, SOC 2 |
| ZeroBounce | $69 | $649 | 100 a month | All-in-one deliverability toolkit |
| BriteVerify | Not published | Not published | Not published | Enterprise buyers who want a sales-led deal |
How we compared
- Price from each vendor's own pricing page, pay-as-you-go, 5K and 100K.
- Terms: credit expiry, unknown-result handling, duplicates.
- Trial: what you get free.
- Not included: accuracy rankings. Published accuracy figures are vendor claims; see how to test a verifier.
Mail Exchange
Lowest price of the five big names at every pack size we checked, credits never expire, unknowns and duplicates refunded, and a six-step check that never sends an email. Trade-offs: a newer brand, API keys on request, no native connectors yet. Pricing.
Emailable
Mid-market prices with the cleanest terms among the established names (non-expiring credits, refunds for unknowns and duplicates) and a SOC 2 Type II badge. Review.
NeverBounce
Competitive pay-as-you-go prices and the cheapest subscription at volume among the names here; pay-as-you-go credits expire after 12 months. Owned by ZoomInfo. Review.
Kickbox
Straightforward packs, no subscription, free unknowns, SOC 2 and GDPR. Priced above Emailable. Review.
ZeroBounce
The broadest toolkit (finder, scoring, inbox tests) and fair unknown handling, at the highest per-email price. Review.
BriteVerify
A long-established name that sells by sales call, with no public self-serve pricing. Review.
Picking one
- Decide your monthly volume and whether it's steady or lumpy.
- Run a blind 500-address test on two or three of them.
- Compare cost per usable result, not just list price. See how to choose.
FAQ
What is the best email verification service?
It depends on volume and terms. For the lowest price Mail Exchange, for steady large volume NeverBounce's Growth plan, for the broadest suite ZeroBounce.
Which email verifier is most accurate?
No independent audit ranks them. Vendors state 98-99%+, and the only meaningful figure is the one from a test on your own list.
Is there a free email verification service?
Several give free credits or a trial: Emailable 250, Kickbox 100, ZeroBounce 100 a month, Mail Exchange a 3-day trial of 25 checks.
Instantly
Smartlead
HubSpot
Mailchimp
Apollo
Zapier
Google Sheets
Make