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ALTCHA is a free CAPTCHA alternative that uses a proof-of-work mechanism to protect your website, and online services from spam.

Which is more popular?
Based on our record, Code.org seems to be a lot more popular than ALTCHA. While we know about 385 links to Code.org, we've tracked only 3 mentions of ALTCHA.
Website, pricing, platforms and company facts side by side.
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| Website | altcha.org | code.org |
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| Company | — | 2012 |
| 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...
No description of Code.org yet.
What each product offers, as listed by its team.


Possible disadvantages
An editorial look at what each product does well and who it suits.


No analysis of ALTCHA yet.
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
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Programming For Kids: Scratch vs Code.org
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How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing ALTCHA and Code.org.
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.
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.
ALTCHA's answer
JavaScript and Svelte.
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.
Share your experience with using ALTCHA and Code.org. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.


We have no reviews of ALTCHA yet. Be the first one to post
Code.org is an online marketplace that can empower students, specifically students, to get detailed knowledge regarding the principles of the computer sciences. This platform can let its users access the free coding...
Nevertheless, the platform has the stats to prove its dependability. More than 67 million people use Code.org, including over two million teachers. In addition, the platform records over 208 million projects so far.
Code.org is much easier to use than Thunkable.First of all names say everything.Second,it has more modes than just "drag-and-drop".
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
Code.org uses an extremely outdated version of javascript, It's so hard to access data in array, im basically forced to do this. Cant wait to ditch this shit. Source: almost 3 years ago
I'm not sure if your 4.5yo is old enough to try Scratch[1] but nothing is too young these days. My elder got into Scratch around that time. These days, my younger one is into https://code.org and she make things go around, do stuffs,... - Source: Hacker News / almost 3 years ago
So I am using code.org to make a platforming game, and if I am halfway off of a platform I slide off of it. Idk if this is a quirk with code.org or if I did something wrong. You can check the hitboxes by pressing debug sprites in the... Source: almost 3 years ago
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Learn the technical skills you need for the job you want. As leaders in online education and learning to code, we’ve taught over 45 million people using a tested curriculum and an interactive learning environment.
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Cloudflare's service for any company to replace CAPTCHAs and deliver a better experience to web visitors.
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