Compare
ZeroBounce vs Bouncer, and the better choice
How ZeroBounce and Bouncer compare on what you get per credit, and why RocketVerifier beats both on cost per usable result, catch-all verdicts, speed and AI tooling.
Side by side
ZeroBounce, Bouncer and RocketVerifier
Each vendor's terms from its own published pages, with RocketVerifier alongside.
| Compare | ZeroBounce | Bouncer |  RocketVerifier |
|---|---|---|---|
| Unknown results | Unknown results are not charged. | Unknown results and duplicates within a list are not charged. | Never charged, and duplicates in a list are free too |
| Bounce refunds | An accuracy guarantee for standard list validation, paid by a written refund formula under its guarantee terms. | If an address marked deliverable bounces within 72 hours of verification for an objective reason, that check is credited or refunded. | Automatic: every hard bounce on a deliverable result is refunded within 30 days when you connect SendGrid, Mailgun, Amazon SES or Postmark |
| Catch-all addresses | Catch-alls are returned as a status. Resolving them uses AI Scoring at 1 extra credit per address, so validation plus scoring is 2 credits. | Deep verification of catch-all addresses hosted by Google and Microsoft. | Every one scored 0 to 100 with a send_safe, send_with_caution or avoid verdict, in the standard 1 credit |
| MCP server for AI agents | An open-source MCP server you install locally. | A remote MCP server for Claude and ChatGPT. | Hosted MCP server for Claude, ChatGPT, Cursor and any MCP client, plus a local npm package |
| OAuth for third-party apps | No OAuth app platform for third-party developers is published on ZeroBounce's site. | No OAuth app platform for third-party developers is published on Bouncer's site. | RocketVerifier Connect: apps connect in one click and verify on the user's own credits |
| Credit expiry | Credits never expire while a ZeroBounce ONE subscription is active. Without one, ZeroBounce says expiration rules may apply. | Credits never expire. | Pay-as-you-go credits never expire, and plan credits roll over |
| Form protection | A JavaScript widget for forms, 1 credit per check. | Bouncer Shield, sold as a separate monthly subscription. | RocketShield, included on every plan |
| SPF, DKIM and DMARC | DMARC and blacklist monitors come with the ZeroBounce ONE subscription; the free plan has no DMARC monitoring. | SPF, DKIM, DMARC and blocklist tests in the Deliverability Kit, sold separately. | Free lookups plus deliverability monitors with alerts, included |
In short
ZeroBounce vs Bouncer at a glance
What each one is, and how RocketVerifier compares head to head.
ZeroBounce
ZeroBounce is an email validation and deliverability platform that sells verification credits alongside a ZeroBounce ONE subscription with monitoring tools.
RocketVerifier vs ZeroBounceBouncer
Bouncer is an email verification service with a real-time API, Bouncer Shield form protection and a Deliverability Kit, sold as separate products.
RocketVerifier vs BouncerThe better choice
Why RocketVerifier beats ZeroBounce and Bouncer
99.5% accuracy, the fastest real-time API, a reason behind every result and every feature on every plan.
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Pay only for usable results
Unknown results and duplicate addresses are never charged. Connect your sending platform and every hard bounce on an address we marked deliverable is refunded automatically.
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A verdict on every catch-all
Accept-all addresses get send_safe, send_with_caution or avoid, included in the standard 1 credit.
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The fastest real-time API
Typically under 400ms, 1 to 3 seconds with a live SMTP check, and up to 100,000 emails per hour in bulk.
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Built for AI agents
A hosted MCP server for Claude, ChatGPT and Cursor, plus RocketVerifier Connect OAuth for third-party apps.
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Credits never expire
Pay-as-you-go credits stay until you use them. Monthly and yearly plans roll unused credits over.
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Integrations included
HubSpot, Salesforce, Mailchimp, Instantly, Smartlead, Zapier, Make, n8n and more on every plan.
FAQ
ZeroBounce vs Bouncer FAQ
What is the difference between ZeroBounce and Bouncer?
ZeroBounce is an email validation and deliverability platform that sells verification credits alongside a ZeroBounce ONE subscription with monitoring tools. Bouncer is an email verification service with a real-time API, Bouncer Shield form protection and a Deliverability Kit, sold as separate products.
Do ZeroBounce and Bouncer charge for unknown results?
ZeroBounce: Unknown results are not charged. Bouncer: Unknown results and duplicates within a list are not charged. RocketVerifier never charges for unknown results or duplicates.
How do ZeroBounce and Bouncer handle catch-all addresses?
ZeroBounce: Catch-alls are returned as a status. Resolving them uses AI Scoring at 1 extra credit per address, so validation plus scoring is 2 credits. Bouncer: Deep verification of catch-all addresses hosted by Google and Microsoft. RocketVerifier scores every catch-all address and returns send_safe, send_with_caution or avoid in the standard 1 credit.
What is the best alternative to ZeroBounce and Bouncer?
RocketVerifier. It verifies with 99.5% accuracy, answers in real time in typically under 400ms, never charges for unknowns, refunds bounces automatically when you connect your sending platform, and includes RocketShield, an MCP server and every integration on every plan. Sign up and get 100 free verification credits instantly. No credit card required.
Vendor facts from each vendor's own published pages, checked November 1, 2026. Sources: ZeroBounce, Bouncer.
Try the better choice on your own list
Verify a real sample and see the difference. Unknowns are free, bounces are refunded and credits never expire.
100 free credits · No card required · Credits never expire