DeBounce covers the basics. BounceZero goes deeper — 40+ signals, 5-stage pipeline, per-email SPF/DKIM/DMARC, AI explanations, and Bayesian + ML scoring that surface what standard SMTP checks miss.
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A transparent comparison — every feature that matters for verification accuracy.
| Feature | DeBounce | BounceZero |
|---|---|---|
| Price per 1,000 emails | $5.00 | $5.00 |
| Credits expire | No | Never |
| Free tier | 100 credits | 100/month, no card |
| Monthly subscription | None required | None required |
| Syntax Check | ||
| MX Lookup | ||
| SMTP Verification | ||
| Disposable Detection | ||
| Catch-All Detection | Basic | |
| Verification signals | ~10 | 40+ |
| Pipeline stages | 2-3 | 5 |
| Per-Email SPF/DKIM/DMARC | ||
| BIMI / MTA-STS / DANE | ||
| Breach Database Check | ||
| Social Profile Detection | ||
| AI-Powered Explanations | ||
| Bayesian + ML Scoring | ||
| Domain Intelligence | ||
| Greylisting Auto-Retry | ||
| Accuracy | ~97% | 99.5% |
A basic SMTP check tells you if a mailbox exists. BounceZero's 40+ signals tell you whether it's likely to bounce, whether it's a real person, and how risky the send actually is.
Know if the sender domain is properly authenticated. Poorly authenticated domains often indicate corporate IT issues that affect deliverability.
Cross-reference against HaveIBeenPwned-style breach records to detect high-risk addresses associated with leaked data sets.
Gravatar, professional network, and developer profile signals indicate whether an address belongs to a real, active person.
Instead of a pass/fail, BounceZero generates a probability score from 0-100 using likelihood ratios and ML ensemble models — giving you granular control over which emails to send to.
Domain age, registrar, hosting patterns, and historical sending behavior feed into the score — catching newly created domains used for temporary accounts.
Every verification result includes a human-readable explanation of why the email received its score — helping you understand risky addresses rather than just seeing a flag.
40+ signals. AI explanations. Bayesian + ML scoring. 100 free credits to start.
Start FreeAlso compare us to Clearout and ZeroBounce.
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