Dev tools · alternatives · 2026

24 alternatives to OOPSpam Anti-Spam API 2.0

A powerful spam filter for any content exchange.

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. OOPSpam Anti-Spam API 2.0 launched in 2019; newer entries below may have overtaken it.

1
OOPSpam API▲6
Multiple machine learning based spam checkers under one API
2018 · oopspam.com · its alternatives →
2
You've Got Spam▲305
A new tool that lets you spam back the spammer
2020 · youvegotspam.mschfmag.com · its alternatives →
3
KillSpam▲70
Getting rid of YouTube spam once and for all
2021 · removespam.app · its alternatives →
4
Spamnesty: Waste spammers' time▲405
2016 · stavros.io · its alternatives →
5
mailX by mailwarm▲596
Email deliverability toolkit for humans and AI agents
May 2026 · themailx.com · its alternatives →
6
Unspam AI▲385
See how your subscribers read your emails with our AI inbox
2024 · unspam.email · its alternatives →
7SA
SQRL – Anti-spam rules language Twitter acquired in 2018, open-sourced▲200
Hey all, author here! This is a demo of the rules engine we built to fight spam/abuse on the internet. It was built based on learnings from Facebook & Google, while trying to make a language that makes it simple for anti-spam analysts to quickly (and safely) deploy rules to production. Unfortunately it looks like the Twitter event feed is temporarily down (they're blocking it, possibly as part of shutting down the API on Thursday). I have a cache of events from a little earlier that I'm going to try play through the stream.
2023 · websqrl.vercel.app · its alternatives →
8
Unspam.email▲299
Email spam checker and newsletter heatmap prediction.
2020 · unspam.email · its alternatives →
9
Spam Checker by Mailmeteor▲88
Detect and remove spam words in your emails
2022 · mailmeteor.com · its alternatives →
10
Bot Butcher▲106
API for classifying contact form spam
2023 · botbutcher.com · its alternatives →
11
Oikik Anti spam▲7
Cloud Based Anti spam Service
2020 · oikik.io · its alternatives →
12
Spam Check▲93
A free JSON API to check your email messages' spam scores
2015 · spamcheck.postmarkapp.com · its alternatives →
13
Grade My Email▲145
Helps you get out of the spam folder.
2020 · grademyemail.co · its alternatives →
14
Email Spam Checker by Autoklose▲105
Send spam-free, high-converting emails
2020 · app.autoklose.com · its alternatives →
15
BounceHunter▲72
Real-time email verification and email cleaning services
2021 · bouncehunter.com · its alternatives →
16
Clearbit's Risk API▲189
Identify spam signups & bad actors
2017 · app.clearbit.com · its alternatives →
17
SpamSieve▲71
Add powerful spam filtering to your Mac’s e-mail client
2018 · c-command.com · its alternatives →
18
Cleanfox▲151
Clean up your inbox, save the earth.
2017 · cleanfox.io · its alternatives →
19
A free tool to easily check your SpamAssasin Score▲12
Instantly check an email
2015 · spamcheck.postmarkapp.com · its alternatives →
20
AnonAddy▲132
Open-source anonymous email forwarding. Stop spam.
2019 · addy.io · its alternatives →
21
IsTempMail – Detect and block disposable email addresses▲35
Detect and block disposable, temporary, fake email addresses. Fight spam, fraud and free trial abuse. Available as WordPress plugin and via JSON API.
2017 · istempmail.com · its alternatives →
22
Bounceless▲16
Clean your email list, avoid getting blocked by spam filters
2016 · bounceless.io · its alternatives →
23
Forget Spam Comment▲72
The fastest & GDPR compliant Anti-Spam plugin for WordPress
2021 · wordpress.org · its alternatives →
24
Spam classifier in Go using Naive Bayes▲29
Spam classifier in pure Go using Naive Bayes. Contribute to igomez10/nspammer development by creating an account on GitHub.
Nov 2025 · github.com · 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 →