We compared the top email verification tools on what actually matters: catch-all detection, real-world accuracy, API latency, and cost. Here is the definitive ranking.
| Feature | BounceZero | ZeroBounce | NeverBounce | Millionverifier |
|---|---|---|---|---|
| Accuracy | 99.8% | 99% | 99% | 97-98% |
| Price per 1K emails | $3.00 | $7-8 | $5-6 | $1.50 |
| Credit expiry | Never | 12 months | 12 months | Never |
| API latency (avg) | provider-dependent timing | 500-700ms | 400-600ms | 200-400ms |
| Catch-all detection | 3-probe | Flag only | Flag only | Flag only |
| Disposable detection | 8,000+ DB | Large DB | Large DB | Medium DB |
| GDPR / EU data | ✓ EU servers | Partial | ✗ US only | ✗ US only |
| Bulk CSV processing | ✓ | ✓ | ✓ | ✓ |
| Real-time API | ✓ | ✓ | ✓ | ✓ |
| Free credits | 100 | 100 | 10 | 200 |
| Webhook support | ✓ | ✓ | ✓ | ✗ |
| SMTP verification | ✓ | ✓ | ✓ | ✓ |
| MX record check | ✓ | ✓ | ✓ | ✓ |
Best for: cold email, API integration, agencies, EU-based teams
BounceZero leads on the two metrics that matter most for cold email and B2B outreach: catch-all detection depth and API speed. Where competitors flag catch-all domains with a single binary result, BounceZero runs a 3-probe SMTP fingerprinting test to estimate the probability that a specific address on a catch-all domain actually exists. This reduces false negatives significantly on B2B lists where 15-23% of domains are catch-all servers.
The provider-dependent API latency makes real-time integration at signup forms practical. At $3/1,000 with never-expiring credits, it is 60% cheaper than ZeroBounce and 40% cheaper than NeverBounce - with comparable or better accuracy.
Best for: teams already using 200+ ZeroBounce integrations
ZeroBounce is the incumbent in the email verification market - it has been around since 2017 and has built the deepest integration ecosystem of any tool in this list. If your ESP, CRM, or marketing automation tool has a native email verification integration, there is a 70% chance it is ZeroBounce.
The drawbacks are price ($7-8/1,000 - more than double BounceZero) and credit expiry (credits expire in 12 months, which hurts infrequent senders). The catch-all detection is flag-only - no probability scoring. For teams that need integrations above everything else, ZeroBounce wins. For everyone else, the price premium is hard to justify.
See our detailed comparison: BounceZero vs ZeroBounce
Best for: teams on monthly plans who need guaranteed SLAs
NeverBounce is solid, well-documented, and predictable. Accuracy is on par with ZeroBounce. API documentation is excellent for developers. The main issue is pricing - $5-6/1,000 with 12-month credit expiry sits awkwardly between ZeroBounce (better integrations) and BounceZero (better price). NeverBounce is a safe choice for teams that need a known quantity without a procurement fight.
See our detailed comparison: BounceZero vs NeverBounce
Best for: very high volume senders where cost matters more than catch-all accuracy
Millionverifier at $1.50/1,000 is the cheapest credible option in the market. Accuracy on easily-verifiable addresses is good (~97-98%). The weakness is catch-all and edge-case handling - flag-only catch-all detection and a smaller disposable email database mean more unknown-state addresses on B2B lists. For high-volume newsletter sends where list is relatively clean and margins matter, Millionverifier makes sense. For cold email where catch-all handling is critical, the savings do not justify the accuracy trade-off.
100 free credits. No credit card. Verify your first list in under 10 minutes.
See how BounceZero stacks up against the competition
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