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. 1
   You've Got Spam▲309

   A new tool that lets you spam back the spammer

   2020 · its alternatives →

2. 2
   KillSpam▲70

   Getting rid of YouTube spam once and for all

   2021 · its alternatives →

3. 3SW
   Spamnesty: Waste spammers' time▲405

   2016 · stavros.io · its alternatives →

4. 4
   mailX by mailwarm▲602

   Email deliverability toolkit for humans and AI agents

   May 2026 · themailx.com · its alternatives →

5. 5
   Unspam AI▲385

   See how your subscribers read your emails with our AI inbox

   2024 · its alternatives →

6. 6SA
   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 →

7. 7
   Unspam.email▲309

   Email spam checker and newsletter heatmap prediction.

   2020 · its alternatives →

8. 8
   Spam Checker by Mailmeteor▲88

   Detect and remove spam words in your emails

   2022 · its alternatives →

9. 9
   Bot Butcher▲106

   API for classifying contact form spam

   2023 · its alternatives →

10. 10
    Oikik Anti spam▲7

    Cloud Based Anti spam Service

    2020 · its alternatives →

11. 11
    Spam Check▲93

    A free JSON API to check your email messages' spam scores

    2015 · its alternatives →

12. 12
    Grade My Email▲145

    Helps you get out of the spam folder.

    2020 · its alternatives →

13. 13
    Email Spam Checker by Autoklose▲105

    Send spam-free, high-converting emails

    2020 · its alternatives →

14. 14
    BounceHunter▲72

    Real-time email verification and email cleaning services

    2021 · its alternatives →

15. 15
    Clearbit's Risk API▲189

    Identify spam signups & bad actors

    2017 · its alternatives →

16. 16
    SpamSieve▲71

    Add powerful spam filtering to your Mac’s e-mail client

    2018 · its alternatives →

17. 17
    Cleanfox▲151

    Clean up your inbox, save the earth.

    2017 · its alternatives →

18. 18
    AnonAddy▲132

    Open-source anonymous email forwarding. Stop spam.

    2019 · its alternatives →

19. 19
    Forget Spam Comment▲72

    The fastest & GDPR compliant Anti-Spam plugin for WordPress

    2021 · its alternatives →

20. 20
    SMS Junk Filter for iOS▲102

    Block unwanted SMS spam text messages

    2017 · its alternatives →

21. 21
    scorespam▲1

    Know before you click

    16d ago · antispam-scoreai.netlify.app · its alternatives →

22. 22
    Spam-Detecting AI by OpenAI▲73

    Spam detection in the physical world

    2017 · its alternatives →

23. 23
    mosparo▲60

    the modern spam protection

    2023 · its alternatives →

24. 24SC
    Spam classifier in Go using Naive Bayes▲29

    Nov 2025 · github.com · its alternatives →

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 →