
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.

CSS Scan
CSS Peeper
Hoverify
SuperDev Pro
Tailwind CSS
CSSViewer
CSS Dig
The easiest way to get and edit the CSS of any website, live

Which is more popular?
CSS Scan Pro 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 | csspro.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 Scan Pro 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
CSS Scan Pro is recommended for web designers, front-end developers, and anyone involved in UI/UX design who frequently works with CSS and seeks to streamline their process. It's especially useful for professionals who need to replicate styles from existing websites or who want to optimize their CSS workflow.
Walkthroughs and reviews on video.
No ALTCHA videos yet. You could help us improve this page by suggesting one.
Editing Nomadlist with CSS Scan Pro Visual Editor (Test)
How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing ALTCHA and CSS Scan Pro.
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 Scan Pro. 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 / 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
That's a lot of features, while still being fast, beautiful, and smooth, CSS Pro now is the smartest and most complete browser extension for CSS. - Source: dev.to / about 1 year ago
CSS Scan and CSS Pro are two of the best chrome extensions for front-end developers I know of. https://getcssscan.com/ https://csspro.com/. - Source: Hacker News / almost 2 years ago
I came across css scan and it looked really nice, but then I came across css scan pro which is extremely similar to it, except for having a monthly payment instead of a one-time. Has anyone ever used these tools before, can tell me which... Source: about 4 years ago
When comparing ALTCHA and CSS Scan Pro, 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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Instantly check or copy computed CSS from any element for only ~95$
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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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Cloudflare's service for any company to replace CAPTCHAs and deliver a better experience to web visitors.
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All-in-one browser extension to improve your web dev experience.
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