NeverBounce vs ZeroBounce

Reachkit makes a competing cold email tool that verifies leads as you import them. Every NeverBounce and ZeroBounce price below was checked in October 2026 on the vendors’ own pages, and every accuracy test names the company that ran it.

My verdict: both do the core job well enough, so the choice comes down to price against hard addresses. NeverBounce is the cheaper way to clean a list, with 10,000 checks for $50 against $129 at ZeroBounce (October 2026). ZeroBounce charges more but answers more of the addresses that decide a B2B bounce rate: it now settles many catch-alls that NeverBounce reports as accept-all, and it never bills you for an unknown result.

Pick NeverBounce if:

• You clean lists now and then and the price per check matters most: $8 buys 1,000, no subscription needed.
• You want a written bounce guarantee on business addresses: above 3% bounces on valid results, NeverBounce refunds the difference.
• Your CRM gains contacts every week and you want them re-checked automatically, paying only for new ones (Growth, from $49 a month).

Pick ZeroBounce if:

• Your prospects work at companies on Microsoft 365, Google Workspace or behind a security gateway, where catch-alls pile up.
• You want 100 free checks a month (sign up with a business email) and no charge for unknowns.
• You’d use warmup, inbox placement tests and blacklist monitoring from the same vendor (ZeroBounce ONE, $99 a month).

Checked October 2026 on each vendor’s pricing page, help center and terms. Prices in USD.

ZeroBounce ONE plans above 10,000 credits are priced in its calculator, so they’re left out here.

The biggest practical gap between NeverBounce and ZeroBounce is what each does with an address a normal check can’t settle. A catch-all server accepts mail for any name at its domain, so a check can’t tell a real person’s inbox from a made-up one, and company domains are full of them.

NeverBounce marks these “Accept all (Unverifiable)” and is upfront that there’s “no definitive way” to tell good from bad (accept-all guide). Its result codes give a rule of thumb: catch-alls bounce at about half the rate of your list’s invalid addresses. Rather than drop them, it suggests mailing them in small batches and watching the bounce rate. Its guarantee doesn’t cover them.

ZeroBounce tries to answer them. It announced in June 2026 that its standard check now turns many catch-alls on Microsoft 365, Google Workspace and major security gateways into valid or invalid, while its facts page dates catch-all resolution to December 2025. Verify+, an optional setting at no extra cost, mails the address and reads any bounce. Anything still open comes back as catch-all.

Unknowns are different: the receiving server didn’t answer in time. NeverBounce says a later re-check usually settles them, and its team reviews lists with many unknowns by hand. ZeroBounce doesn’t bill for them and says 80% of unknowns are bad addresses in most cases.

Two ZeroBounce settings matter for a cold list. With Verify+ on, ZeroBounce sends an email to the address to check for bounces (Verify+), so a real prospect may get a message you didn’t write before your first one lands; ZeroBounce doesn’t say whether the setting starts on or off. And its “accept_all” sub-status, for big domains like amazon.com that rarely bounce, counts as valid, so filter it out for a strict list.

NeverBounce and ZeroBounce start the same way: upload a CSV, check one address in the dashboard, or call the API, and nothing is mailed to the address unless you turn on ZeroBounce’s Verify+.

NeverBounce adds a free first step. Its analysis looks at a list and says whether it’s worth paying to clean. Downloads come as presets, such as deliverable only or all results, with optional columns for role accounts, free-mail hosts and similar flags. On Growth, Sync connects a CRM or email platform and re-checks it daily, weekly or monthly, charging only for new, unique emails. NeverBounce says it can clean 10,000 emails in as little as 3 minutes, and reviewers often praise its speed.

ZeroBounce returns more detail per address: seven statuses, plus sub-statuses. Spam traps and abuse addresses get their own status, and do-not-mail separates role addresses like sales@, throwaway domains, possible traps and a suppression list that includes “known litigators” (status codes). On a cold list, those flags tell you more than the valid count.

Every published benchmark of NeverBounce and ZeroBounce I could find was run by a company that sells its own verifier, and the scores swing with the list.

Context changes each row. Hunter’s test counted unknowns as wrong and ran before ZeroBounce’s catch-all update. ZeroBounce’s list was built to be “deliberately adversarial” and mixes consumer and company mail. Anymail Finder chose addresses a standard check can’t resolve, and called NeverBounce’s habit of declining to guess “a defensible engineering position”.

Read together, the two land close on ordinary lists, and on catch-all-heavy lists ZeroBounce gives far more answers, though not always right ones: Anymail Finder counted 61 addresses ZeroBounce called valid that bounced. Both vendors also publish a comparison page about the other, which I’d read as sales copy.

ZeroBounce has grown into a deliverability suite, while NeverBounce has stayed a verifier and built toward CRMs and automations.

ZeroBounce ONE costs $99 a month for 10,000 credits, or $79 a month billed yearly (October 2026). Each month it adds 10,000 email finder or domain searches, 100 inbox placement tests, 100 server tests, 250 warmup seeds, 10 blacklist monitors and DMARC monitoring for one domain. Credits roll over; tests, seeds and monitors don’t. Its managed warmup works only with paid Google, Microsoft or SMTP accounts. For builders there’s a REST API with a sandbox, separate APIs for warmup and placement tests, and an official open-source MCP server, so Claude or Cursor can validate a list or check your ZeroBounce balance from a chat. Connecting it is free; each check spends a credit.

NeverBounce puts its effort into connections: a REST API, a JavaScript widget that checks addresses on signup forms, webhooks, Zapier, Make and an official n8n node. Growth adds AI scoring of each email for risk, tone and compliance, guardrails that check an AI agent’s emails before they go out, and “200 new leads/month picked by AI” from a source NeverBounce doesn’t name. My research turned up no official NeverBounce MCP server, only third-party ones.

If you already run warmup and monitoring elsewhere, ZeroBounce’s packs fit better than ONE.

Both vendors put a guarantee in writing, but the conditions decide whether a cold list qualifies.

• NeverBounce: if more than 3% of the valid results bounce, it refunds the difference. The list needs 500+ unique addresses, mailed within 72 hours of cleaning; accept-all, unknown and free webmail addresses such as Gmail and Yahoo don’t count (guarantee). Its published conditions don’t include an opt-in rule.
• ZeroBounce: if accuracy drops below its threshold, it refunds five times the amount for each 1%. You mail only the valid file, within 72 hours, to at least 1,000 addresses, and the list “must be an opt-in list that you collected and not purchased from a 3rd party” (guarantee). Most cold lists won’t qualify.

Neither refunds unused credits. ZeroBounce’s one exception is a first ONE subscription cancelled within 30 days with very light use.

On data, NeverBounce’s terms say uploaded lists remain yours. Contact data from an app you connect is treated differently: NeverBounce “may use this information for its own purposes”, and unless you opt out in privacy settings you grant it “an irrevocable license to … sell, transfer, assign, sublicense, disclose, or make available the Contact Data”. ZeroBounce’s terms say validation data may be stored for 30 days, and they include a clause about using the service to send unsolicited email. If you send cold, read that clause yourself.

Neither tool sends campaigns, so this compares verification only. I priced the two standard cold email scenarios at list prices from each vendor’s public pricing page, October 2026: a founder adding about 1,500 new prospects a month (10 inboxes, about 4,000 emails), and an agency or team adding about 10,000 (60 inboxes, about 25,000 emails).

Assumptions: one credit per address, monthly billing unless noted, packs used before they expire (so the founder buys NeverBounce’s 10,000 pack, not 25,000). ZeroBounce’s 100 free monthly checks and free unknowns would trim its column slightly.

What the numbers leave out:

• NeverBounce: Growth includes CRM re-checks. With auto-upgrade on, running out moves you to the next size and charges right away.
• ZeroBounce: ONE’s price includes warmup seeds, placement tests and monitoring; packs cost less if you only need checks.
• Reachkit: a whole cold email platform, sending from inboxes you connect with no per-inbox fee; checking costs 1 credit per 10 addresses. Done-for-you inboxes raise the founder to about $95 a month and the team to about $424 (monthly billing). Growth stores 5,000 contacts, full in about month four at this pace; Scale T1’s 25,000 fill in about 2.5 months, so you prune old leads or move up a tier.

ZeroBounce is rated higher than NeverBounce on all three review sites, from far more reviews.

G2 and Capterra figures are as Google showed them. NeverBounce doesn’t invite Trustpilot reviews, so its small sample arrived unprompted. ZeroBounce does invite them, and most of its Trustpilot reviews are more than a year old (76 of 2,136 came in the last 12 months).

NeverBounce: speed and ease of use lead the praise. A Reddit user comparing verifiers over three years called it “Very fast, especially for small lists. Good API reliability”, while noting “occasional inconsistencies with catch-all domains” (thread). The repeat complaints: too many unknowns (G2), credits that expire (Trustpilot) and price (Capterra).

ZeroBounce: the same Reddit user gave it “Solid accuracy, especially with risky emails”, and a Capterra reviewer valued how easily it runs as an automation. Cost on large lists is the steady complaint on G2, and one G2 reviewer wished it wouldn’t charge again to re-check addresses already verified. G2 also lists inaccuracy among reported cons.

This is our product. If you’re checking a list because you’re about to cold email it, Reachkit checks it inside the campaign, so there’s no separate verifier to pay or file to move.

• Checked on import. CSV imports are verified by default at 1 credit per 10 addresses. Invalid addresses are dropped; catch-all and unverifiable ones wait for your decision.
• Leads that arrive verified. Lead Finder searches 500M+ people. A lead costs 1 credit once its email verifies, and the credit comes back if none does.
• Bounce protection while sending. Bounced leads stop, and a campaign pauses when bounces reach 5%.
• The sending side. AI-written warmup on every inbox, your own inboxes with no per-inbox fee, or Google and Microsoft inboxes Reachkit sets up for $5 a month on domains it registers at $15 a year (October 2026).

Growth costs $39 a month (October 2026) with 1,000 credits, enough to check 10,000 imported addresses. What you give up: Reachkit won’t re-check a CRM or newsletter on a schedule, has no signup-form check, and runs no placement tests or blacklist monitoring. Keep NeverBounce or ZeroBounce for those. For a finder and verifier that also sends, see Reachkit vs Hunter.

Moving between NeverBounce and ZeroBounce is mostly a matter of moving files, because your lists don’t live inside either tool.

• Lists: download results from one and upload your original file to the other. NeverBounce’s terms say uploaded lists stay yours.
• Credits: neither refunds unused credits, so spend a balance down first. NeverBounce’s expire 12 months after purchase.
• Results: they don’t map one to one. Some of NeverBounce’s accept-alls will come back valid or invalid at ZeroBounce. ZeroBounce files “accept_all” under valid, and treats role addresses as do-not-mail where NeverBounce offers them as an optional column.
• Connections: both work with HubSpot, Mailchimp and Zapier, but Sync, API keys and code need setting up again.
• Timing: both guarantees expect you to mail within 72 hours of the check, so verify close to launch.

I’d choose by the list. Cold email is mostly list quality, and on B2B lists the catch-alls decide the bounce rate. ZeroBounce now answers many of them and doesn’t bill unknowns, so for prospects on Microsoft 365 and Google Workspace domains it earns its higher price. For occasional small lists, signup forms or CRM hygiene, NeverBounce does the job for less. Before buying a big pack, run the same 1,000 addresses from your own market through both and compare the catch-all and unknown share. And if you’re verifying only to send cold email, Reachkit’s 30-day trial does it inside the campaign.

Related: the NeverBounce profile, the ZeroBounce profile, MillionVerifier, Kickbox and Hunter alternatives.