Alternatives

Products that do what mails.so does

mails.so — Unbeatably simple email validation

1. 1
   Free Email Verifier▲202

   The first free and accurate email verification service

   2020

2. 2
   Email Verify API▲92

   Simple email validation API for a $39 lifetime license

   2021

3. 3
   Validate Email – 100% Free & Private▲28

   Instant Email Verification – Real, Reachable & Secure

   2025

4. 4
   Bulk Email Verifier & Checker▲115

   The top tool for checking mail address authenticity

   2023

5. 5
   Proofy▲181

   Quickly validate and verify your email lists.

   2016

6. 6
   Self host Email Validation▲51

   Cleanmails - Unlimited email verification

   Jan 2026

7. 7
   Email Validator API ▲7

   It tells you if a Email is valid or not

   Oct 2025 · thirsty-melisse-hardcode-c2fce731.koyeb.app

8. 8
   EmailAddress.ai▲9

   Verify Catch-all Emails with confidence

   2025

9. 9
   MailCheck▲49

   Stop Free Trial Abuse with Advanced Email Verification

   2025

10. 10
    Email Validator by Sidemail▲16

    Free email address validator (inc. SMTP deep check)

    Feb 2026 · sidemail.io

11. 11
    is-valid.email▲7

    is-valid.email - professional email verification service

    2024

12. 12
    Lero - Email Validator▲118

    Zero bounce for founders

    2025

13. 13
    Validemail.co▲5

    Simple & fast email validation for everyone

    2025

14. 14
    Proofy 2.0▲199

    A bulk email verification service

    2019

15. 15
    BounceBan▲123

    Unlimited free email verify, works great for accept-all

    2022

16. 16
    Email List Validator – Free▲10

    Validate your email list online (DNS/MX/SMTP checks + more)

    Sep 2025 · sidemail.io

17. 17
    SmartEmailCheck▲9

    Smarter Email Validation—Built for Modern Apps.

    Nov 2025 · smartemailcheck.com

18. 18
    EmailToCheck▲5

    Free email verification tool

    2024

19. 19
    Free Email Validator - Full Source Code▲6

    Cold Email Validation Tool with Full Source Code

    Nov 2025

20. 20
    Email Checker - Easy Email Verification▲8

    Email Checker that reduces bounces instantly

    Oct 2025 · easyemailverification.com

21. 21
    Email Finder by Truelist▲19

    Find anyone's work email — verified, not guessed

    Jul 2026 · truelist.io

22. 22
    Bulk Email Validation▲80

    Clean your existing email lists with mailbox verification

    2019

23. 23
    Email Bounce Checker from BlockSurvey▲98

    Privacy-focused email bounce checker. No ads, no trackers.

    2022

24. 24
    Mailerio▲30

    Keep your lists clean with email validation tool

    2025

Ranked by how close each launch is in meaning, then by votes. Refine with a description →