
GitHub
GitLab
BitBucket
openDesktop.org
Gitea
Launchpad.net
OSOR
The Complete Open-Source and Business Software Platform.

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.

Which is more popular?
Based on our record, ALTCHA seems to be more popular. It has been mentioned 4 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | sourceforge.net | altcha.org |
| Pricing | — | |
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| Listed in |
In their own words, as submitted to SaaSHub.


No description of SourceForge yet.
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...
What each product offers, as listed by its team.


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


Overall verdict
Why this product is good
Recommended for
No analysis of ALTCHA yet.
Walkthroughs and reviews on video.
Presearch Privacy Review #27 - Sourceforge
More videos
No ALTCHA videos yet. You could help us improve this page by suggesting one.
How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing SourceForge and ALTCHA.
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 SourceForge and ALTCHA. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.


SourceForge is a great place for people who like open-source software. It offers a strong platform where you can find, review, and handle software, all while helping the open-source community.
SourceForge’s user interface works fine, but it could do with a modern overhaul to make it easier on the eye and give it a more intuitive feel. While it has a large community, SourceForge’s support is not as extensive...
Sourceforge has been around longer than most, and it has the projects to prove it. Lots of open source Linux, Windows and Mac projects are hosted on SF. It has a totally different project structure when compared with...
We have no reviews of ALTCHA yet. Be the first one to post
Recommendations tracked on public social media and blogs since March 2021.


Tracking SourceForge since Mar 2021.
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... - Source: dev.to / 6 days ago
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 / 5 months ago
Here's how PoW works for form protection (using the ALTCHA wire format):. - Source: dev.to / 6 months ago
When comparing SourceForge and ALTCHA, you can also consider the following products.

Originally founded as a project to simplify sharing code, GitHub has grown into an application used by over a million people to store over two million code repositories, making GitHub the largest code host in the world.
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reCAPTCHA is a free security service that protects your websites from spam and abuse.
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Create, review and deploy code together with GitLab open source git repo management software | GitLab
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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.
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Bitbucket is a free code hosting site for Mercurial and Git. Manage your development with a hosted wiki, issue tracker and source code.
Compare BitBucket to SourceForge or ALTCHA:

Cloudflare's service for any company to replace CAPTCHAs and deliver a better experience to web visitors.
Compare Cloudflare Turnstile to SourceForge or ALTCHA: