Side by side
MailboxValidator vs Prime Verifier
Both stand on email verification services. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Free plan APIWeb
MailboxValidator offers both API and bulk-list checking, with a wide set of validation checks and integrations. Before choosing it, consider its Yahoo and non-ASCII limitations, and review the stated retention policy.
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Free plan APIWeb
Prime Verifier offers list cleaning, risk scoring and developer-focused API workflows with a useful free allowance. Its integration coverage is broad, while some automation connections remain under development or review.
Visit Prime VerifierThe facts
| MailboxValidator | Prime Verifier | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | Not published | Not published |
| Runs on | API, Web | API, Web |
| Lowest paid plan | See the plans | Free or on request |
| Plans published | 10 | 2 |
| Maker | Not published | Not published |
| Website | mailboxvalidator.com | primeverifier.com |
| On email verification services | #19 of 36 | #23 of 36 |
MailboxValidator: what it does well
- Bulk validation accepts text or CSV lists.
- Single-address API results are available in JSON or XML.
- Checks include disposable addresses, DMARC, and strict SPF.
- Free API plan lists 300 queries per month.
What to know first
- Yahoo email validations are unsupported.
- Non-ASCII addresses are marked invalid.
- The FAQ says refunds are not offered.
- Personal data is retained indefinitely, subject to policy limits.
Prime Verifier: what it does well
- 100 free verifications without a credit card
- Bulk CSV and TXT cleaning up to millions
- 0–100 risk scores with signal details
- REST API supports webhooks and bulk jobs
- 13 native integrations plus Zapier
What to know first
- Bulk files and results remain up to 15 days
- Make app is still being built
- n8n node awaits review
Alternatives to MailboxValidator Alternatives to Prime Verifier The whole list