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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.

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Smart CSS viewer tailored for Designers.
Which is more popular?
CSS Peeper might be a bit more popular than ALTCHA. We know about 3 links to it since March 2021 and only 3 links to ALTCHA.
Website, pricing, platforms and company facts side by side.
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| Website | altcha.org | csspeeper.com |
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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 CSS Peeper 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.
No ALTCHA videos yet. You could help us improve this page by suggesting one.
CSS Peeper: new tool for Web Designers
How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing ALTCHA and CSS Peeper.
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 CSS Peeper. 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
CSS Peeper is one of the best Chrome extensions for web developers to extract more design and focus less on digging codes. It is intuitive to use. So easy to find an element and its styles on a page than it is with...
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 / 6 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
You can indeed inspect the site with your browser's dev tools, or you have some Chrome extensions like: https://csspeeper.com/ that make the process more straightforward. Source: almost 4 years ago
Think CSS inspection through DevTools impractical or intimidating? CSS Peeper arrives to make inspecting styles easier and more elegant. It also intelligently extracts the site's color palette and makes it easy to export your assets. - Source: dev.to / about 5 years ago
@CSSPeeper 🌎 https://csspeeper.com/ CSS peeper is visual version of the chrome developer tools. It's great for designers looking to quickly & easily inspect the CSS from a website. Source: about 5 years ago
When comparing ALTCHA and CSS Peeper, 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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Cloudflare's service for any company to replace CAPTCHAs and deliver a better experience to web visitors.
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