ZeroBounce
DeliverabilityEmail validation with a bundled deliverability toolkit, sold on credits
The most certified and most reviewed pure email verifier, and the rare one where prepaid credits genuinely do not expire.
Best for
Marketing and RevOps teams that want list hygiene, warmup, placement testing and monitoring from one certified vendor instead of stitching three of them together.
Not great for
A small sender who only needs a few thousand verifications a year, where the ZeroBounce ONE minimum of 10,000 credits a month is far more than the job requires.
Starting price
$39/mo
Pricing model
Credit packs
Free trial
Free plan instead
Platforms
Web app, Chrome extension, iOS
Founded
2015
Headquarters
United States
ZeroBounce, in plain terms
ZeroBounce is an email validation and deliverability platform founded in 2015 by Liviu Tanase and headquartered in Santa Barbara, California. The core product verifies email addresses in bulk or in real time through an API with SDKs in 16 languages, flagging invalid, disposable, abuse and catch-all addresses and returning detailed status codes plus IP geolocation. The company guarantees 99.6 percent accuracy in writing, backed by a published 5x refund formula, and reports a 1.75 percent unknown rate in 2025 with unknown results never charged. Around that sits a broader deliverability suite: AI-powered scoring that rates catch-all addresses from 1 to 10, an email finder, warmup with seed networks, inbox placement testing, blacklist monitoring across 200 plus lists, DMARC monitoring, activity data on engaged subscribers and a unified deliverability dashboard. ZeroBounce ONE bundles all of it into one monthly subscription. Credits never expire on any account type, which is unusual in this category, and a permanent free tier gives 100 validations a month to any business domain. The platform is heavily certified, listing SOC 2 Type 2, ISO/IEC 27001:2022, HIPAA, GDPR, CCPA, PCI and Data Privacy Framework participation, and it runs its own data centre rather than public cloud. There are 92 published integrations plus Zapier, Make, n8n and Workato.
Key features
- Bulk and real-time email validation with detailed status codes
- AI Email Scoring for catch-all addresses on a 1 to 10 scale
- Email finder and domain search with real-time verification
- Email warmup using seed networks across major mailbox providers
- Inbox placement testing across major providers
- Blacklist monitoring across 200+ global lists
- DMARC monitoring for spoofing and unauthorised senders
- Activity data identifying engaged subscribers over 30 to 180 days
Pros
- Credits never expire on any account type, and unknown results are not charged
- Certification stack is unusually deep: SOC 2 Type 2, ISO/IEC 27001:2022, HIPAA, GDPR, CCPA, PCI and Data Privacy Framework participation
- ZeroBounce ONE bundles validation, scoring, finder, warmup, inbox placement, blacklist and DMARC monitoring on one credit pool
- Permanent free tier of 100 validations a month for business domains, useful for evaluation
- 92 published integrations plus Zapier, Make, n8n, Workato, browser extensions and an iOS app
- Accuracy is guaranteed in writing with a published 5x refund formula rather than a marketing number alone
Cons
- ZeroBounce ONE starts at 10,000 credits a month, so the subscription entry point is high for light users
- The email finder burns 20 credits per successful query, which drains a validation budget quickly
- Headline accuracy, uptime and unknown-rate figures are all vendor measured, with no independent benchmark published
- Premium API rate limits, activity data and faster file processing are gated behind the ONE subscription rather than pay-as-you-go
- The product surface is broad, so buyers who only want list cleaning pay for a deliverability suite they may not use
Cost at scale
ZeroBounce ONE at the published $99 per month covers 10,000 credits, about $0.0099 per verification, falling to about $0.0079 per verification at the $79 annual rate. Volume above 1,000,000 credits per month is quoted
Users claimed
600,000+ customers across 200+ countries claimed, with 60 billion plus emails validated claimed
| Plan | Price | Limits | Includes |
|---|---|---|---|
| Freemium | $0 per month | Requires a business or premium domain at signup, 100 validations per month | 100 validation credits refilled monthly, 10 email finder credits, 1 inbox placement test and 1 email server test, 1 blacklist monitor scanned every 24 hours |
| Pay-as-you-go | From $39 one-off credit purchase | Credits only, the ZeroBounce ONE premium benefits are not included | No subscription commitment, Credits never expire, Unknown results are not charged, 15 percent off with autopay enabled |
| ZeroBounce ONE (monthly) | $99 per month, 10,000 credits minimum | Minimum 10,000 credits per month, email finder queries cost 20 credits each | Validation, AI scoring, email finder and domain search on one credit pool, Warmup seeds, inbox placement tests, blacklist monitors, DMARC monitor domains and email server tests, Activity data and Gold recipients, deep deliverability insights, Premium API rate limits, faster file processing and VIP 24/7 support |
| ZeroBounce ONE (annual) | $79 per month, billed annually | Annual commitment, 10,000 credit per month minimum | Same bundle at a 20 percent discount, Credits never expire |
| Enterprise | Custom quote | Quoted, contact required | Volume pricing above 1,000,000 credits per month, Dedicated support |
From their published pricing, August 2026. Pay-as-you-go starts at $39, with 15 percent off when autopay is enabled. The ZeroBounce ONE subscription is $99 per month, or $79 per month billed annually, with a 10,000 credit per month minimum. Check their pricing page.
What reviews praise
- Reviewers consistently rate accuracy and support highly, with the vendor citing about 4.8 out of 5 across roughly 4,079 reviews
- Trustpilot rates ZeroBounce about 4.8 out of 5, one of the higher scores among email verifiers
- Users praise credits that never expire and the policy of not charging for unknown results
- Buyers in regulated industries cite the SOC 2, ISO 27001 and HIPAA certifications as the deciding factor
What reviews flag
- Vendor-published breakdowns show G2 lower than the other sites, about 4.7 across roughly 1,367 reviews versus 4.8 on Trustpilot and Capterra
- Reviewers note the credit cost of the email finder at 20 credits per successful query
- Some buyers report the ZeroBounce ONE minimum of 10,000 credits a month is more than they need
- All headline accuracy and speed numbers come from the vendor, and reviewers occasionally report differing results on catch-all heavy lists
Distilled from public reviews and community threads. Not Weezly's opinion, and not a rating.
API access
Public validation, scoring and finder API with SDKs in 16 languages, multiple API keys per account, premium rate limits on ZeroBounce ONE
Compliance
SOC 2 Type 2 certified since March 2022, ISO/IEC 27001:2022 certified by MSECB, HIPAA certified August 2023 with BAA available, GDPR, CCPA, CPRA and PCI compliance claimed, Data Privacy Framework participant since December 2017
Data export
Bulk file download, CRM and storage connectors including Amazon S3, Azure Blob Storage, Google Drive, Dropbox and SQL Server
Automation platforms
Zapier, Make, n8n, Workato, Cloudflare Workers and RapidAPI
Integrations
HubSpot
Salesforce
Mailchimp
Klaviyo
ActiveCampaignMarketoMicrosoft Dynamics 365
PipedriveZoho CRMBrevo
SendGridMailgun
Clay
Apollo
Zapier- HQ
- Santa Barbara, California, United States, at 10 E Yanonali St
- Founded
- 2015, legal entity Hertza LLC
- Leadership
- Liviu Tanase, founder and CEO, with Brian Minick as COO and Paul Pintiliescu as CTO
- Company page
Their published pricing in August 2026 offers three routes. Pay-as-you-go credits start at $39 with 15 percent off if you turn on autopay. The ZeroBounce ONE subscription is $99 per month, or $79 per month on annual billing, and starts at 10,000 credits per month. Above 1,000,000 credits a month it moves to a quote. One credit validates or scores one email address, and the email finder costs 20 credits per successful query. Check their pricing page for current figures.
Yes. The Freemium tier is $0 and refills every month with 100 validation credits, 10 email finder credits, 1 inbox placement test, 1 email server test and 1 blacklist monitor scanned every 24 hours. It requires signing up with a business or premium domain.
No. ZeroBounce states that credits never expire on any account type, including pay-as-you-go purchases, and that unknown results are not charged. That is a meaningful difference from verifiers that put an expiry window on prepaid credits.
The company guarantees 99.6 percent accuracy in writing and publishes a 5x refund formula per percentage point if accuracy falls below the threshold. It reports 96 percent plus on AOL, Yahoo and Office 365 and a 1.75 percent unknown rate for 2025. Those are vendor figures, so treat them as claims backed by a published guarantee rather than independent testing.
Yes. Alongside validation it sells AI email scoring for catch-all addresses, an email finder and domain search, warmup, inbox placement testing, blacklist monitoring across 200 plus lists, DMARC monitoring and activity data on engaged subscribers, all bundled under ZeroBounce ONE.
One of these tools is ours.
Weezly is in this directory too: LinkedIn outreach with AI clone videos, a 300M+ leads database and booking, from $59 per month. See if it earns a spot in your stack.