Dev tools · alternatives · 2026

24 alternatives to OOPSpam API

Multiple machine learning based spam checkers under one API

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. OOPSpam API launched in 2018; newer entries below may have overtaken it.

1. 1
   OOPSpam Anti-Spam API 2.0▲58

   A powerful spam filter for any content exchange.

   2019 · oopspam.com · its alternatives →

2. 2
   Unspam AI▲385

   See how your subscribers read your emails with our AI inbox

   2024 · unspam.email · its alternatives →

3. 3
   Spam Checker by Mailmeteor▲88

   Detect and remove spam words in your emails

   2022 · mailmeteor.com · its alternatives →

4. 4
   Spam Check▲93

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

   2015 · spamcheck.postmarkapp.com · its alternatives →

5. 5
   Unspam.email▲299

   Email spam checker and newsletter heatmap prediction.

   2020 · unspam.email · its alternatives →

6. 6
   AnyParser API▲885

   The first LLM for document parsing with accuracy and speed

   2024 · cambioml.com · its alternatives →

7. 7
   Prelude Verify▲479

   Verify more users for less cost with our spam-free SMS API

   2024 · prelude.so · its alternatives →

8. 8
   Bot Butcher▲106

   API for classifying contact form spam

   2023 · botbutcher.com · its alternatives →

9. 9
   mailX by mailwarm▲596

   Email deliverability toolkit for humans and AI agents

   May 2026 · themailx.com · its alternatives →

10. 10
    Mail Tester▲309

    Test the spamminess of your email

    2016 · mail-tester.com · its alternatives →

11. 11
    Spam-Detecting AI by OpenAI▲73

    Spam detection in the physical world

    2017 · its alternatives →

12. 12
    You've Got Spam▲305

    A new tool that lets you spam back the spammer

    2020 · youvegotspam.mschfmag.com · its alternatives →

13. 13
    Checker▲124

    Detect fake signups in under 200ms with an easy-to-use API

    2025 · its alternatives →

14. 14
    Email Spam Checker by Autoklose▲105

    Send spam-free, high-converting emails

    2020 · app.autoklose.com · its alternatives →

15. 15
    KillSpam▲70

    Getting rid of YouTube spam once and for all

    2021 · removespam.app · its alternatives →

16. 16
    Using word vectors to classify spam messages▲104

    Using word vectors to classify spam messages. Contribute to doodyparizada/word2vec-spam-filter development by creating an account on GitHub.

    2017 · github.com · its alternatives →

17. 17
    Plino▲68

    An Intelligent spam filtering system

    2016 · plino.herokuapp.com · its alternatives →

18. 18
    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 →

19. 19
    A free tool to easily check your SpamAssasin Score▲12

    Instantly check an email

    2015 · spamcheck.postmarkapp.com · its alternatives →

20. 20
    Warmup Inbox▲204

    Free email spam checker & inbox placement tester

    2023 · warmupinbox.com · its alternatives →

21. 21
    BounceHunter▲72

    Real-time email verification and email cleaning services

    2021 · bouncehunter.com · its alternatives →

22. 22
    Vetter▲134

    Test if your emails will be spammed, using real accounts.

    2020 · vetter.monsoonyeti.com · its alternatives →

23. 23
    Email Bounce Checker from BlockSurvey▲98

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

    2022 · blocksurvey.io · its alternatives →

24. 24
    Email Spam Words API▲82

    Free API to list all email spam words in different languages

    2021 · 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 →