Features
Email list verification Developer API Advanced reporting Enhanced Validation SDKs & Libraries MCP Server Recurring Validation Chrome Extension
Use Cases
Email Verification Bulk Email Verification Email List Cleaning Real-Time Form Validation SaaS Platforms Signup Validation Import Validation Automated List Hygiene
Integrations Pricing Docs Resources
ContactEmail Verification Comparison
Mails.so vs ZeroBounce
Comparing two popular email verification services to help you make an informed decision.
Mails.so
Modern email verification
check Modern, clean interface
check Competitive pricing
check Good for smaller lists
close Newer service with less proven track record
close Limited integration options
ZeroBounce
Email verification and deliverability platform
check Free Verify+ second pass for catch-all and disabled Yahoo/AOL addresses
check Email scoring and activity data features
check Good documentation and API
close Pay-as-you-go pricing becomes expensive at scale
close Interface feels outdated compared to modern alternatives
Key differences that set them apart
close Mails.so | close ZeroBounce | |
|---|---|---|
| Pricing Model | Usage-based pricing with limited credits that can run out quickly for active teams. | Pay-as-you-go pricing that can quickly become expensive, especially when adding data enrichment features. |
| Validation Speed | Slower performance on larger lists compared to more established providers. | Validation times can be slower for larger lists, creating bottlenecks for time-sensitive campaigns. |
| User Interface | Modern and aesthetic but less optimized for bulk workflow operations. | The interface feels outdated and credit management can be confusing for new users. |
| API and Integrations | Limited native integrations - mostly API-only with basic functionality. | While it offers extensive integrations, setup can be complex and often requires technical expertise. |
| Validation Accuracy | Standard validation without advanced accuracy features for risky emails. | SMTP validation that resolves some catch-alls (notably Microsoft 365 and Google Workspace) in the standard pass, plus an optional Verify+ second pass that can take up to 48 hours. Remaining catch-alls can get an activity-based score (0–10) for an extra credit per address — a signal, not a confirmation. |
Pricing comparison
Mails.so | ZeroBounce | |
|---|---|---|
| Validate 50k email list | $149 | $499 |
| Validate 100k email list | $229 | $649 |
| 50k API validations | $149 | $499 |
| 100k API validations | $229 | $649 |
Looking for a better alternative?
Instead of choosing between Mails.so and ZeroBounce, consider Truelist: accurate email validation on credits that never expire, with Unlimited plans for high-volume senders.
Truelist
truelist.io
Free to start
Truelist offers pay-as-you-go validation on credits that never expire — with unlimited plans for high-volume senders — plus advanced Enhanced Validation technology and native integrations with 50+ platforms.
check Enhanced Validation with 2x more accurate results
check Pay-as-you-go credits that never expire
check Volume rates down to $0.70 per 1,000 — plus unlimited plans for high volume
check Modern, intuitive interface
check Native integrations with 50+ platforms
check Built for teams with dashboards and reporting
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