Dev tools · alternatives · 2026

24 alternatives to mailboxlayer

Email Validation & Verification JSON API for Developers

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. mailboxlayer launched in 2021; newer entries below may have overtaken it.

1
Email Verify API▲92
Simple email validation API for a $39 lifetime license
2021 · cloudlyn.com · its alternatives →
2
mailboxlayer API▲6
Free & Simple Email Verification API
2015 · mailboxlayer.com · its alternatives →
3
Email Validator!▲193
Free JSON API that gives you a simple way to validate emails
2015 · garridodiaz.com · its alternatives →
4
Free Email Verifier▲202
The first free and accurate email verification service
2020 · gmass.co · its alternatives →
5
Legitmailbox▲75
Email Verification API with monthly reports
2021 · its alternatives →
6
Spam Check▲93
A free JSON API to check your email messages' spam scores
2015 · spamcheck.postmarkapp.com · its alternatives →
7
Proofy▲181
Quickly validate and verify your email lists.
2016 · proofy.io · its alternatives →
8
MailCheck▲49
Stop Free Trial Abuse with Advanced Email Verification
2025 · mail-check.tech · its alternatives →
9
Email Validator API ▲7
It tells you if a Email is valid or not
2025 · thirsty-melisse-hardcode-c2fce731.koyeb.app · its alternatives →
10RA
REST API for Global Address Verification▲80
Automate and personalize direct mail at scale while our nationwide print network speeds delivery, controls postage costs, and keeps every send compliant.
2013 · lob.com · its alternatives →
11
APIddress — email validation API▲17
The email validation API that shows its work
Jun 2026 · apiddress.com · its alternatives →
12
Self host Email Validation▲51
Cleanmails - Unlimited email verification
Jan 2026 · its alternatives →
13
Weblegit Email Validation Service▲72
A real customer starts with a real email
2017 · weblegit.com · its alternatives →
14
Bulk Email Verifier▲78
Validates email addresses, checks deliverability
2022 · outscraper.com · its alternatives →
15
Email Verification API▲4
Real-time and convenient email validation tool
2021 · emailverification.whoisxmlapi.com · its alternatives →
16
emailstuff.io▲14
Reliable email validation for clean lists and deliverability
2025 · emailstuff.io · its alternatives →
17
EmailDetective – A Email Validation API▲6
Hello, I'm Andrew, owner of EmailDetective. I was looking for an API solution for email validation/scoring for multiple mailing lists. I noticed a lot of the email validation services out there: - Do not have an API - Are behind a paywall to try the API - Are priced way to high - Have inconsistent or non-intuitive APIs So I decided to create my own solution. This is my first time announcing EmailDetective, so I am looking for any general feedback, issues you might have run into and if you find this service useful. And yes you can try it out for free without signing up :)
2024 · emaildetective.io · its alternatives →
18
Email Validation and Verification API▲2
Validate and verify email address
2018 · its alternatives →
19
Email Validator API▲8
This is an easy way to check email addresses
2020 · its alternatives →
20MS
Maildown – super simple email API▲40
2020 · maildown.dev · its alternatives →
21
Mailerio▲30
Keep your lists clean with email validation tool
2025 · mailerio.com · its alternatives →
22
Totus Email Validation API▲5
Stop Bounced Emails Killing You Business, Get Real Users
2025 · gototus.com · its alternatives →
23
Email Verifier API▲5
Verify Emails. Eliminate Hard Bounces. Boost Deliverability
2025 · rapidapi.com · its alternatives →
24
Real-time email validation JS Widget▲30
Verify an email address typed in your form in real-time
2020 · app.thechecker.co · its alternatives →

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Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →