Side by side

CaptainVerify vs MailboxValidator

Both stand on email validation software. Which one you can start free with, which one lets you read the code, and what each costs once you pay.

CaptainVerify

Free trial APIWeb

CaptainVerify offers email and mobile verification through bulk files, forms, and an API. Its coverage, retention controls, and France-only hosting address operational and data-location requirements, while usage limits remain important to plan around.

Visit CaptainVerify

MailboxValidator

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.

Visit MailboxValidator

The facts

	CaptainVerify	MailboxValidator
Free plan	A free trial	Yes
Open source	Not published	Not published
Runs on	API, Web	API, Web
Lowest paid plan	Mobile verification subscription: $36 a month	See the plans
Plans published	2	10
Maker	Not published	Not published
Website	captainverify.com	mailboxvalidator.com
On email validation software	#10 of 13	#6 of 13

CaptainVerify: what it does well

CSV and TXT list uploads
Files can contain up to 1 million lines
HLR coverage spans 96 countries
100 free email credits for new accounts
French data hosting

What to know first

No free plan
API limited to 50 checks per minute
API allows two simultaneous connections
No telephone support

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.

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