
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.

Flarum
phpBB
Vanilla Forums
XenForo
NodeBB
MyBB
Forumbee
Discourse is an open source discussion platform built for the next decade of the Internet.

Which is more popular?
Based on our record, Discourse should be more popular than ALTCHA. It has been mentioned 23 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | altcha.org | discourse.org |
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| 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 Discourse yet.
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 Discourse.
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 Discourse. 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
Discourse is a basic forum function that could be an alternative to Telegram if you want to stick to text discussions. It's pretty analog, missing both video and livestreaming tools. Instead, Discourse is a basic...
Discourse comes in a couple of flavours. You can self-host it yourself in which case the software is free, and you simply need to sign up for server space, or you can pay Discourse for a hosted-for-you option, though...
I used Flarum when trying to get a community set up for my product (ended up abandoning it to revisit when we have a larger customer base). It worked fairly well and I enjoyed it but it's definitely beta and unless...
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
GitHub Discussions can also be a great place for support as long as these are regularly monitored. Another option along the same lines is Discourse and the Open Source Matrix which is used by quite a few Open Source and community-based... - Source: dev.to / over 2 years ago
A lot of communities use [Discourse ](https://discourse.org). [LPSF](https://forum lpsf.org) migrated to it when Yahoo Groups was discontinued. Some of the advantages are that it's open source, self-hostable, and can be configured to... - Source: Hacker News / over 2 years ago
More like https://discourse.org/. You can run it yourself, but I can also just have them ding a credit card every month and not think about it again (I do this for a community). - Source: Hacker News / almost 3 years ago
When comparing ALTCHA and Discourse, you can also consider the following products.

reCAPTCHA is a free security service that protects your websites from spam and abuse.
Compare reCAPTCHA to ALTCHA or Discourse:

Flarum is the next-generation forum software that makes online discussion fun. It's simple, fast, and free.
Compare Flarum to ALTCHA or Discourse:

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 Discourse:

Raspberry Pi. The Raspberry Pi is a cheap, credit-card sized computer. The official website uses phpBB for their discussion forums. phpBB is not affiliated with nor responsible for any of the sites listed on the showcase.
Compare phpBB to ALTCHA or Discourse:

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

Build an engaging community forum using Vanilla's modern cloud forum software.
Compare Vanilla Forums to ALTCHA or Discourse: