
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.

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 | webpixie.io |
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| Company | — | Startup from the United Kingdom · 1 - 9 employees · 2025 |
| 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...
WebPixie is an all-in-one website monitoring platform for website owners, SaaS teams, developers, and digital agencies. It helps teams detect technical issues before they affect users by monitoring: - Website uptime and response times - SSL certificate validity and expiration - DNS records and...
What each product offers, as listed by its team.


How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing ALTCHA and WebPixie.
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.
WebPixie's answer:
WebPixie is built around website health rather than just uptime. From one dashboard it combines uptime checks from multiple global locations, SSL certificate chain validation, DNS monitoring across 20+ record types including DNSSEC, domain expiry via WHOIS/RDAP, a link crawler, sitemap monitoring and an indexability checker (robots.txt, llms.txt, canonical checks), and rolls the results into a 0–100 WebPixie Site Score. There is nothing to install: add a domain and choose the checks you want. AI-supported analysis is used in selected features.
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.
WebPixie's answer:
Choose WebPixie if you manage websites rather than servers: site owners, agencies and marketing or SEO-minded teams who want SSL, DNS, domain, link and crawlability checks together instead of separate tools. The free plan covers 3 websites and 5 uptime monitors with SSL, DNS (including DNSSEC), domain expiry and the Site Score, no credit card required. Paid plans add faster checks, Slack and webhook alerts, incident management, API access and team workspaces. If you mainly need many uptime monitors, very frequent checks, or ping, port and cron monitoring, dedicated uptime tools may fit you better.
ALTCHA's answer
JavaScript and Svelte.
WebPixie's answer:
WebPixie is primarily built with React on the frontend, Python and Node.js on the backend, and MongoDB as the database.
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.
WebPixie's answer:
WebPixie is built for website owners, SaaS teams, developers, digital agencies, e-commerce businesses, and technical teams managing one or multiple websites. It is particularly useful for teams that want to detect technical issues before they affect customers.
WebPixie's answer:
WebPixie was created around a simple observation: a website can remain online while many important problems develop quietly in the background. SSL certificates can expire, DNS records can change, domains can approach expiration, links can break, and website content can be modified unexpectedly. WebPixie was built to bring these signals together and make website monitoring more complete, understandable, and proactive.
WebPixie's answer:
WebPixie is currently growing its user base among website owners, SaaS teams, developers, and agencies.
Share your experience with using ALTCHA and WebPixie. 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
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 / 14 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 / 5 months ago
Here's how PoW works for form protection (using the ALTCHA wire format):. - Source: dev.to / 7 months ago
Tracking WebPixie since Aug 2026.
When comparing ALTCHA and WebPixie, 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.
Compare hCaptcha to ALTCHA or WebPixie:

Website health monitoring for your entire site, not just the homepage.
Compare Oh Dear! to ALTCHA or WebPixie:

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