Dev tools · alternatives · 2026

24 alternatives to mailboxlayer API

Free & Simple Email Verification API

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. mailboxlayer API launched in 2015; newer entries below may have overtaken it.

1
mailboxlayer▲3
Email Validation & Verification JSON API for Developers
2021 · mailboxlayer.com · its alternatives →
2
Email Validator!▲193
Free JSON API that gives you a simple way to validate emails
2015 · garridodiaz.com · its alternatives →
3
Email Verify API▲92
Simple email validation API for a $39 lifetime license
2021 · cloudlyn.com · its alternatives →
4
Spam Check▲93
A free JSON API to check your email messages' spam scores
2015 · spamcheck.postmarkapp.com · its alternatives →
5
Legitmailbox▲75
Email Verification API with monthly reports
2021 · its alternatives →
6
Free Email Verifier▲202
The first free and accurate email verification service
2020 · gmass.co · its alternatives →
7
Quick Email Verification▲8
Free Email Verification
2015 · quickemailverification.com · its alternatives →
8
Context.IO▲226
API for email inboxes
2015 · its alternatives →
9
Helo▲103
An independent email API from former Postmark folks
22d ago · helohq.com · its alternatives →
10
Validator.pizza▲99
Free API to block 🗑 disposable emails
2017 · usercheck.com · its alternatives →
11
MailCheck▲49
Stop Free Trial Abuse with Advanced Email Verification
2025 · mail-check.tech · its alternatives →
12
APIddress — email validation API▲17
The email validation API that shows its work
Jun 2026 · apiddress.com · its alternatives →
13
Mailguard▲3
Email verification API with a free tier, up to 100x cheaper
Jun 2026 · mailguard-api.atek.workers.dev · its alternatives →
14
Self host Email Validation▲51
Cleanmails - Unlimited email verification
Jan 2026 · its alternatives →
15MS
Maildown – super simple email API▲40
2020 · maildown.dev · its alternatives →
16
VerifyRight▲5
Catch fake emails before they signup
2025 · verifyright.io · its alternatives →
17
Email Checker▲3
Free email verification tool
2015 · email-checker.net · its alternatives →
18
Real-time email validation JS Widget▲30
Verify an email address typed in your form in real-time
2020 · app.thechecker.co · its alternatives →
19
Email Validation and Verification API▲2
Validate and verify email address
2018 · its alternatives →
20
SmartEmailCheck▲9
Smarter Email Validation—Built for Modern Apps.
Nov 2025 · smartemailcheck.com · its alternatives →
21
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 →
22
Email verification made simple - JSON API and Webform▲3
Stop bouncing and start connecting with our email check API
2017 · its alternatives →
23
Rapid Email Validator 2025▲13
Privacy-first free email verifier | no storage | open source
2025 · rapid-email-verifier.fly.dev · its alternatives →
24
Transmit▲8
Free sandbox email API. Credits that roll over.
Sep 2026 · transmit.dev · 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 →