
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.

Anyfiddle
Nova Code Editor
draw.io
The Coda Doc Gallery
CodeMyUI
Flowtion
Exact Flow
An easy solution to create product flows.

Which is more popular?
Based on our record, ALTCHA should be more popular than Code2Flow. It has been mentioned 4 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | altcha.org | code2flow.com |
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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 Code2Flow yet.
What each product offers, as listed by its team.


Possible disadvantages
Walkthroughs and reviews on video.
No ALTCHA videos yet. You could help us improve this page by suggesting one.
code2flow for Confluence - hassle-free way to create flowcharts
How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing ALTCHA and Code2Flow.
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 Code2Flow. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 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 / 27 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 / 6 months ago
Here's how PoW works for form protection (using the ALTCHA wire format):. - Source: dev.to / 7 months ago
Somebody knows if there is an extension for VSCode/Codium to have the visual representation of the flow of the code . I am looking for an auto flow chart creation from C, C+ or C++ code. Sample could be like http://code2flow.com. - Source: dev.to / over 5 years ago
When comparing ALTCHA and Code2Flow, you can also consider the following products.

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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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