Work · alternatives · 2026
24 alternatives to DOOM Captcha
Captchas don't have to be boring
DOOM Captcha is a captcha verification system that replaces traditional text-based challenges with a simple playable version of the classic DOOM game. Users must complete basic gameplay elements to prove they are human… Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. DOOM Captcha launched in 2021; newer entries below may have overtaken it.
- 1
Captcharoo▲88Proof of humanity, check that you're not talking with an AI
2023 · captcharoo.com · its alternatives →
- 2
CAPTCHA that filters out humans and only lets programs pass
2018 · humansnotinvited.com · its alternatives →
- 3
- 4RC
2014 · hashcash.io · its alternatives →
- 5
Ending the CAPTCHA agony in a unique way.
2013 · areyouahuman.com · its alternatives →
- 6
Race to solve CAPTCHAs, last player standing wins
Apr 2026 · sean-reid.github.io · its alternatives →
- 7
- 8TT
2014 · frantzmiccoli.github.io · its alternatives →
- 9TC
2011 · thecaptchaexperiment.com · its alternatives →
- 10
Hassle-free CAPTCHA. Stop Bots, Stay Secure.
2023 · dashboard.leminnow.com · its alternatives →
- 11
I sometimes pick up random projects just because I can, this was one of those times. I made it as a week long project a while back this year but never shared here, so thought to go for it haha. I created a game inspired by Doom and the backrooms called The Backdooms under 2.4kb in minified html. (for reference, this entire post would be around 1.8kB haha) I had to use a not popular way of using GZip with Zlib headers (had to write my own script for compressing it, also in the repo) to eventually convert it a size 40 QR code that works right in your browser using Decompressionstream API. This…
2025 · github.com · its alternatives →
- 12
Squat Captcha▲231The worst captcha ever! Forces you to do 10 squats
2020 · vivirenremoto.github.io · its alternatives →
- 13
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 · its alternatives →
- 14
- 15BC
2013 · boundit.co · its alternatives →
- 16
GeeTest▲68Smarter way to stop bad bots, protect websites, apps & APIs
2021 · geetests.com · its alternatives →
- 17
Open source proof-of-work captcha for bot protection
2025 · p-captcha.com · its alternatives →
- 18
A free browser puzzle that turns CAPTCHAs into play
Jul 2026 · captchagame.cc · its alternatives →
- 19
Google's update to CAPTCHA just asks if you're robot
2014 · cloud.google.com · its alternatives →
- 20
ZENCAPTCHA▲115Privacy-first bot & spam defense, GDPR compliant CAPTCHA
2023 · zencaptcha.com · its alternatives →
- 21TP
This is the inevitable post after jeff_harris released restful-doom https://news.ycombinator.com/item?id=14919534 twitch-plays-doom is a Python Twitch IRC->restful-doom proxy to control doomguy with a staggering 8 second delay. The project was Saturday night's 'I wonder if I can make this work' session. Since it's been live there has been a team of four successfully make it to half way through E01M01. I've since added godmode to the chat (you can guess the command). This was fun, hope others get some enjoyment out of it. Twitch Stream/Chat…
2017 · its alternatives →
- 22
A CAPTCHA game themed on pareidolia 🤖
2021 · clementliu.github.io · its alternatives →
- 23
PG has posted about improving social networks using something like an "intellectual CAPTCHA" many times [1][2][3][4] - "Make users pass a test on basic concepts like the distinction between necessary and sufficient conditions before they can tweet." I felt the same way. So I built one using a mix of simple math, logic, and Twitter/X Community Noted posts. Try sample questions here - https://mentwire.com/sample - without signing up. - Invites are temporarily open to HN users. - Onboarding test + one daily question before accessing feed, post or reply. - Posts authors are…
Apr 2026 · mentwire.com · its alternatives →
- 24FA
Friendly Captcha is a privacy-compliant, accessible alternative to traditional CAPTCHAs. It protects your websites and apps from bots and spam.
2020 · friendlycaptcha.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 →