Alternatives

Products that do what FriendlyCaptcha – a privacy friendly proof-of-work based CAPTCHA does

1. 1RC
   Replace CAPTCHA with Proof-of-Work▲89

   2014 · hashcash.io

2. 2
   Cap▲431

   A lightweight, modern open-source captcha

   2025

3. 3TC
   The Captcha Experiment▲15

   2011 · thecaptchaexperiment.com

4. 4
   Are You a Human?▲67

   Ending the CAPTCHA agony in a unique way.

   2013

5. 5CA
   Commento: a fast, privacy-focused alternative to Disqus▲271

   2019 · commento.io

6. 6
   No CAPTCHA reCAPTCHA▲181

   Google's update to CAPTCHA just asks if you're robot

   2014

7. 7
   ZENCAPTCHA▲115

   Privacy-first bot & spam defense, GDPR compliant CAPTCHA

   2023

8. 8HC
   HN Chat – Minimal Hacker News Chat with User Verification▲180

   2016 · hnchat.com

9. 9TT
   Tricking the user to access history using CSS and captchas▲140

   2014 · frantzmiccoli.github.io

10. 10ST
    Snapchan - the Snapchat-only image board▲37

    2013 · snapchan.com

11. 11AC
    AI Captcha Solver for Chrome▲8

    2023 · github.com

12. 12TU
    TrueCaptcha -Using Deep learning to solve text captchas▲6

    2019 · apitruecaptcha.org

13. 13RC
    Replace CAPTCHAs with WebAuthn passkeys for bot prevention▲71

    I built Nocaptcha after getting frustrated with traditional CAPTCHAs both as a user and developer. WebAuthn passkeys offered a promising alternative that's both more secure and user-friendly. What makes Nocaptcha different: - Uses WebAuthn standard instead of puzzle-solving - No need for users to remember passwords or solve puzzles - Open source Current limitation: Working with W3C WebAuthn Community Group on true passkey disposal for this use case. Looking for feedback particularly on: 1. Integration experience 2. User experience compared to traditional CAPTCHAs

    2024 · github.com

14. 14RC
    rePOWCHA – CAPTCHA that stops Humans, powered by crypto▲9

    2021 · repowcha.com

15. 15NA
    Nod – Anonymous proximity messenger▲53

    2015 · yougotthenod.com

16. 16BC
    BoundIt CAPTCHA: highlight objects in photos to prove you're human▲24

    2013 · boundit.co

17. 17AA
    AiDee – a open source micro-framework for Touch ID and Face ID▲43

    2020 · github.com

18. 18UA
    Up1 – An open-source, client-side encrypted image host and pastebin▲21

    2015 · github.com

19. 19CT
    Captcha to detect bots with a simple question▲5

    Apr 2026 · joshryandavis.github.io

20. 20HA
    HuggingFace and OpenAI powered Reply Bot with privacy protection▲5

    2023 · github.com

21. 21TA
    Tinylivechat - A cookie free, privacy friendly embeddable LiveChat▲6

    2021 · tinylivechat.com

22. 22TA
    Thread – Ad-free social networking and iMessage alternative▲35

    2019 · get.thread-app.com

23. 23MO
    Monoid – Open-Source Privacy Automation (YC S21)▲9

    2023 · github.com

24. 24
    sCaptcha▲5

    A privacy-based captcha you can count on

    Dec 2025

Ranked by how close each launch is in meaning, then by votes. Refine with a description →