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ALTCHA Alternatives
Similar projects and alternatives to ALTCHA
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AppSignal
Monitoring that respects your time & budget. APM, error tracking, and dashboards for modern web apps. Ten-minute setup, transparent flat pricing, and support from engineers who actually use the product.
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nopecha-extension
Automated CAPTCHA solver for your browser. Works with Selenium, Puppeteer, Playwright, and more. (by NopeCHALLC)
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nopecha-extension
Discontinued Automatically solve reCAPTCHA, hCaptcha, FunCAPTCHA, AWS CAPTCHA, and text-based CAPTCHA with a browser extension.
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NopeCHA
Discontinued Automatically solve reCAPTCHA, hCaptcha, FunCAPTCHA, AWS CAPTCHA, and text-based CAPTCHA with a browser extension.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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apache-ultimate-bad-bot-blocker
Apache Block Bad Bots, (Referer) Spam Referrer Blocker, Vulnerability Scanners, Malware, Adware, Ransomware, Malicious Sites, Wordpress Theme Detectors and Fail2Ban Jail for Repeat Offenders
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spamscanner
Spam Scanner is a Node.js anti-spam, email filtering, and phishing prevention tool and service. Built for @ladjs, @forwardemail, @cabinjs, @breejs, and @lassjs.
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cap
privacy-first, open-source and self-hosted CAPTCHA alternative with PoW and instrumentation challenges. (by tiagozip)
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friendly-challenge
The widget and docs for the proof of work challenge used in Friendly Captcha. Protect your websites and online services from spam and abuse with Friendly Captcha, a privacy-first anti-bot solution.
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disposable-email-domain-list
List of disposable email domains. You can use it to block fake users on your newsletter.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a better ALTCHA alternative or higher similarity.
ALTCHA discussion
ALTCHA reviews and mentions
Posts with mentions or reviews of ALTCHA.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2026-10-06.
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Self-Hosted Proof of Work with ALTCHA: A Turnstile Alternative for Magento
ALTCHA won on the boring things. It is open source, self-hosted and collects nothing, and it ships official libraries in both Go and PHP, the two languages our two layers already speak. So the same protocol runs twice on every store, by default: once at the edge, in front of everything, and once inside Magento, on the storefront forms.
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A self-hosted Google reCAPTCHA alternative (we ship it)
The captcha on orkestr is Altcha. Self-hosted, no third-party JS, no Google, no behavioral tracking. Users don't see a puzzle. There's a single checkbox and a quiet "verifying..." while the browser does some math. About a second, total.
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Why Proof-of-Work Beats CAPTCHA for Form Protection
Here's how PoW works for form protection (using the ALTCHA wire format):
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Wicketkeeper – privacy-friendly, self-hostable PoW CAPTCHA
Go based, similar to JS based ALTCHA https://altcha.org/ discussed at https://news.ycombinator.com/item?id=43971068
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Private Captcha VS ALTCHA - a user suggested alternative
2 projects | 18 Oct 2025
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Forget IPs: using cryptography to verify bot and agent traffic
Altcha is a similar thing: https://github.com/altcha-org/altcha
I recently implemented a very similar thing to its obfuscation via proof-of-work (https://altcha.org/docs/obfuscation/) in my C++ REST backend and flutter front-end, and use it for rate-limiting on APIs that allow creation of a new account or sending sign-up e-mails.
I have an authentication token that's then wrapped with AES-GCM using a random IV and the client is given the key, IV stem and a maximum count for the IV.
- Lightweight open source reCaptcha alternative
- Altcha – privacy-friendly captcha alternative
- Altcha – free, open-source Captcha alternative
- Open source GDPR compliant alternative for Recaptcha and CF Turnstile
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A note from our sponsor - AppSignal
www.appsignal.com | 9 Oct 2026
Stats
Basic ALTCHA repo stats
11
2,805
8.3
5 days ago
altcha-org/altcha is an open source project licensed under MIT License which is an OSI approved license.
ALTCHA is marked as "self-hosted". This means that it can be used as a standalone application on its own.
The primary programming language of ALTCHA is TypeScript.
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APM, error tracking, and dashboards for modern web apps. Ten-minute setup, transparent flat pricing, and support from engineers who actually use the product.
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