
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.

Basin
Formcarry
Web3Forms
Formspree.io
Forminit
ActionForms.io
FormBold
FormsList is a form backend: change your form's action URL and every submission is stored, spam-checked and emailed to you, with no server code. 200 free submissions a month. Pro adds Slack, Sheets and Notion. Works from ChatGPT and Claude via MCP.

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 | altcha.org | formslist.com |
| Pricing | ||
| Platforms | — | |
| Company | — | Startup from India |
| 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...
FormsList is a form backend for websites. Point any HTML form's action attribute at your FormsList endpoint and every submission is stored, checked for spam and emailed to you, with no server code. The free plan includes 200 submissions a month, 5 forms, spam scoring, a honeypot, CAPTCHA support...
What each product offers, as listed by its team.


No features have been listed yet.
How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing ALTCHA and FormsList.
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 FormsList. 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 / 26 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
Tracking FormsList since Oct 2026.
When comparing ALTCHA and FormsList, 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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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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Make your HTML <form> completely functional under a minute without a single line of backend code.
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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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Contact forms for static websites without PHP or Backend server
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