
reCAPTCHA
hCaptcha
Cloudflare Turnstile
Akismet
Private Captcha
mosparo
Cap Captcha
ALTCHA is a free CAPTCHA alternative that uses a proof-of-work mechanism to protect your website, and online services from spam.

GitHub Codespaces
CloudShell
CodeTasty
StackHive
Coda for iOS
CodeAbbey
Slingcode
Write code. Catch Bananas. Save the World.

Which is more popular?
Based on our record, ALTCHA seems to be more popular. It has been mentioned 3 times since March 2021.
Website, pricing, platforms and company facts side by side.
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|---|---|---|
| Website | altcha.org | codemonkey.com |
| Pricing | ||
| Platforms | — | |
| Company | — | Startup from Israel · 20 - 49 employees · 2014 |
| Listed in |
In their own words, as submitted to SaaSHub.


ALTCHA uses a proof-of-work mechanism to protect your website, APIs, and online services from spam and unwanted content. Unlike other solutions, ALTCHA is free, open-source and self-hosted, without external services, does not use cookies nor fingerprinting, does not track users, and is fully...
Codemonkey is an interactive online platform designed to make learning code fun for kids from 5-14 years old. Through engaging games and challenges, it introduces programming concepts in a clear and accessible way. As children write code to help a monkey complete different tasks and puzzles, they...
What each product offers, as listed by its team.


Possible disadvantages
Walkthroughs and reviews on video.
How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing ALTCHA and CodeMonkey.
ALTCHA's answer
What makes ALTCHA unique is that it is free, open-source and self-hosted, without external services, does not use cookies nor fingerprinting, does not track users, and is fully compliant with GDPR. Unlike other captcha solutions, ALTCHA does not require users to solve puzzles or captchas and uses a proof-of-work mechanism instead.
CodeMonkey's answer:
CodeMonkey stands out by teaching real programming languages like CoffeeScript and Python through fun, game-based challenges. Unlike many platforms that rely only on block coding, it gradually transitions students to text-based coding for a more authentic experience. Its engaging storyline, where kids help a monkey complete tasks by writing code, keeps learners motivated and invested. The platform also supports educators with detailed lesson plans, progress tracking, and classroom management tools. With its global accessibility and step-by-step guidance, CodeMonkey makes coding approachable and enjoyable for children everywhere.
ALTCHA's answer
Here are some key reasons why a person should choose ALTCHA over its competitors:
So in summary, ALTCHA's privacy compliance, open design, accessibility, machine compatibility and modern approach give it clear advantages over competing captcha solutions.
CodeMonkey's answer:
CodeMonkey is a great choice because it makes learning to code fun and exciting through interactive games and real coding languages. Unlike some other platforms that stick to just drag-and-drop blocks, CodeMonkey helps kids start writing real code early on. It’s super easy to use, with step-by-step instructions and instant feedback to keep learners on track. Teachers and parents also love it because it comes with ready-made lessons and tools to track progress. Plus, it’s used all over the world and available in different languages, so anyone can jump in and start coding!
ALTCHA's answer
Our primary audience for ALTCHA Forms includes enterprises, medium and small businesses, non-profits, and individuals who need a reliable, secure, and compliant solution for data collection and management. Whether you're a large corporation dealing with extensive regulatory requirements, a small business looking to protect customer and employee data, a non-profit organization managing sensitive information, or an individual seeking robust data security, ALTCHA Forms provides the tools and features necessary to meet your needs. With a focus on compliance, user-friendly design, and advanced security measures, our platform is tailored to support diverse users in navigating complex regulatory landscapes and ensuring data protection.
CodeMonkey's answer:
CodeMonkey’s primary audience is children, typically aged 5 to 14, who are just starting to explore the world of coding. It’s designed for young learners who enjoy games and interactive challenges that make learning feel like play. The platform is also a great fit for educators and parents looking for a fun, structured way to teach programming. With content suitable for beginners and more advanced students, it appeals to a wide range of skill levels. Overall, CodeMonkey is perfect for curious kids who love solving puzzles and want to build real coding skills in a fun, supportive environment.
CodeMonkey's answer:
CodeMonkey was founded in 2014 by Jonathan Schor, Ido Schor, and Yishai Pinchover, inspired by their experiences teaching kids to code through playful activities. They envisioned a platform that would make coding accessible and enjoyable for children, blending real programming languages with engaging, game-based learning. Launched in Israel, CodeMonkey quickly gained global traction, reaching over 34 million students in 206 countries by 2024 . In 2018, it was acquired by TAL Education Group but continues to operate independently, expanding its offerings to include courses in AI, data science, and digital literacy. Today, CodeMonkey remains committed to empowering young learners worldwide through fun and effective coding education.
ALTCHA's answer
JavaScript and Svelte.
Share your experience with using ALTCHA and CodeMonkey. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.


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. - Source: dev.to / 4 months ago
Here's how PoW works for form protection (using the ALTCHA wire format):. - Source: dev.to / 5 months ago
Go based, similar to JS based ALTCHA https://altcha.org/ discussed at https://news.ycombinator.com/item?id=43971068. - Source: Hacker News / 9 months ago
Tracking CodeMonkey since Mar 2021.
When comparing ALTCHA and CodeMonkey, you can also consider the following products.

reCAPTCHA is a free security service that protects your websites from spam and abuse.
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GItHub Codespaces is a hosted remote coding environment by GitHub based on Visual Studio Codespaces integrated directly for GitHub.
Compare GitHub Codespaces to ALTCHA or CodeMonkey:

Do you use a captcha to keep out bots? hCaptcha is a drop-in replacement for reCAPTCHA that earns website owners money and helps companies get their data labeled.
Compare hCaptcha to ALTCHA or CodeMonkey:

Cloud Shell is a free admin machine with browser-based command-line access for managing your infrastructure and applications on Google Cloud Platform.
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Cloudflare's service for any company to replace CAPTCHAs and deliver a better experience to web visitors.
Compare Cloudflare Turnstile to ALTCHA or CodeMonkey:

CodeTasty is a programming platform for developers in the cloud.
Compare CodeTasty to ALTCHA or CodeMonkey: