ZeroBounce vs NeverBounce
ZeroBounce and NeverBounce are the two verifier names most buyers already know. They sell the same check in different shapes. ZeroBounce puts its verifier inside a deliverability suite and prints its prices. NeverBounce sells pay-as-you-go credits beside a subscription it calls Sync, and its pricing pages block automated reads, so no NeverBounce figure appears here.
| ZeroBounce | NeverBounce | |
|---|---|---|
| How you buy | Pay-as-you-go credits, or a monthly plan called ONE | Pay-as-you-go credits, or a subscription called Sync |
| Entry price | $39 for 2,000 credits | Quoted by NeverBounce; its pricing page blocks automated reads |
| Free allowance | 100 checks a month | Free credits at signup, terms on its own site |
| Unknown results | Not charged, per its facts page | No billing rule on its readable docs |
| Catch-all output | A 1 to 10 score per address | catchall, labelled 'Accept-all (Unverifiable)' |
| Accuracy claim | 99.6% on most domains | On pages that block automated reads |
| Bulk speed | 45 to 60 minutes per 100,000 | Not readable on its site |
| Around the verifier | Inbox placement, blacklist monitoring, DMARC tools, activity data | Zapier and Make apps |
Figures read from each vendor's own page in September 2026. Prices move, so confirm on the vendor's own pricing page before you buy.
Where each one is stronger
What each vendor does that the other does not, stated as capability rather than advice.
ZeroBounce strengths
- ZeroBounce puts its terms on its own pages. Credits start at $39 for 2,000, you get 100 free checks a month, and its facts page says unknown results are not charged. It scores each catch-all address from 1 to 10 instead of leaving one flat label. Around the verifier sit inbox placement tests, blacklist monitoring, DMARC tools and activity data. ZeroBounce's security page lists SOC 2 Type 2 and ISO 27001, which shortens a vendor review.
NeverBounce strengths
- NeverBounce keeps its result codes simple and public. Its developer docs list five: valid, invalid, disposable, catchall and unknown. A catchall result carries the label 'Accept-all (Unverifiable)', which tells you exactly what you're holding. You can pay as you go or subscribe through Sync, and it lists apps on both Zapier and Make. Engineers can scope the API from those docs before anyone books a sales call.
What separates ZeroBounce from NeverBounce
Start with unknown results, because they move your real cost more than any tier does. ZeroBounce says on its facts page that unknowns are not charged. NeverBounce's developer docs define unknown as a server that cannot be reached, and they give no billing rule. Ask NeverBounce in writing whether an unknown result costs a credit. Which verifiers charge for unknowns lists the vendors that answer on their own pages.
Catch-all handling is where their files look most different. ZeroBounce gives each catch-all address a score from 1 to 10, so you pick the cut-off. NeverBounce returns catchall and leaves the call with you. Neither output confirms a mailbox, because a catch-all domain says yes to every address it's asked about. What Accept-all (Unverifiable) means walks through what to do with those rows.
Their accuracy claims won't settle the choice. ZeroBounce prints 99.6% on most domains, and NeverBounce's figure sits on pages that refuse scripted readers. Both kinds of figure count right answers among the verdicts returned, after catch-alls and silent servers have left the pool. You get a fairer test from your own list: send the same 5,000 addresses through both and count the rows with no verdict. How coverage and accuracy differ shows why that count matters more.
What ZeroBounce and NeverBounce both run into
Vendor accuracy percentages in this category count how often a returned verdict was right. They are calculated after the catch-alls and the servers that refuse to answer have left the denominator. Hunter tested 15 verifiers on 3,000 real business addresses (3 November 2025) and measured 31.2% to 70.0% overall. Both kinds of figure are real and they are not measuring the same thing.
Questions about ZeroBounce and NeverBounce
Does ZeroBounce charge for unknown results?
No. ZeroBounce's facts page says unknowns are not charged, read in September 2026. Catch-all addresses are billed, and each one comes back with a score from 1 to 10.
How does NeverBounce price its credits?
NeverBounce sells pay-as-you-go credits and a subscription called Sync. Its pricing and help pages blocked automated reads in September 2026, so we print no NeverBounce rate. Ask NeverBounce for a written quote at your volume.
Is ZeroBounce or NeverBounce more accurate?
No published figure settles it. ZeroBounce claims 99.6% on most domains, and NeverBounce's claim sits on pages that block automated reads. Run the same 5,000 addresses through both and compare how many rows came back with no verdict.
What does NeverBounce mean by Accept-all (Unverifiable)?
It is NeverBounce's label for a catchall result. The domain accepts mail for any address, so no check can confirm that one mailbox exists. ZeroBounce handles the same case with a score from 1 to 10.
Ask NeverBounce two things in writing: its rate at your volume and whether unknowns cost a credit. Set the answers beside ZeroBounce's published pricing and the NeverBounce review, or browse every head-to-head comparison.
A third option, and we built it
100 free checks a month, no card, and credits that never expire. Unknown results are never billed.