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Captcha with GDPR compliance Captcha with GDPR compliance

Next-Gen Captcha
and Spam Protection

ALTCHA provides cutting-edge spam and abuse protection for websites and apps. Our privacy-friendly Captcha alternative and other solutions are designed with GDPR compliance in mind, ensuring robust security without compromising user privacy.

AntiSpam

ALTCHA’s AntiSpam offers a powerful combination of Captcha and intelligent Spam Filtering, blocking unwanted submissions before they get to you.

It ensures reliable protection from bots and spam, all while keeping the user experience smooth, frustration-free and GDPR compliant.

AntiSpam - Spam and Abuse Protection

Free Captcha

ALTCHA uses a proof-of-work mechanism to protect your website, apps, APIs, and online services from spam and unwanted content.

Unlike other solutions, ALTCHA’s Captcha alternative is free, open-source and self-hosted, does not use cookies nor fingerprinting, does not track users.

GDPR compliant CAPTCHA and reCAPTCHA alternative
Privacy-first backend for websites and apps

ALTCHA SaaS goes beyond spam protection with privacy-friendly Analytics for real-time insights and Forms for secure, seamless data collection.

Analytics

Public Beta

ALTCHA Analytics offers a privacy-first, cookie-free alternative to Google Analytics, providing real-time, actionable insights into your audience while respecting their privacy.

Cookie-less Analytics for websites and apps

Forms

Public Beta

ALTCHA Forms enables secure data collection through registration and personal data forms, questionnaires, and surveys, ensuring compliance with data protection regulations such as GDPR.

GDPR compliant and secure data collection with forms.
Simple and Flexible Pricing
Pro Recommended
Starting at
€9 / month
Includes:
Advanced protection
AntiSpam
Analytics
Forms
GDPR compliant
Limits:
Analytics: 1,000 events / day
AntiSpam: 50 verifications / day
Forms: 10 forms

Increase the limits by purchasing additional volume or add-ons.

Open Source
MIT license
Free
Basic protection
Self-hosted Captcha
GDPR compliant

Add-Ons

Burst
€7 / month
Manage traffic spikes with up to 2,000 events and 100 verifications per day. Extra capacity applies for any 10 days within a 30-day period.
AntiSpam
€14 / month
Get access to the AntiSpam API with up to 2,000 verifications per day—ideal for spam protection without the full platform.
User
€4 / month
Add an extra user seat to your account to collaborate seamlessly with teammates.

Robust Abuse Protection and Privacy

ALTCHA combines Proof of Work (PoW) and an advanced Spam Filter to deliver robust spam and abuse protection. PoW creates computational barriers for bots, while the Spam Filter checks IPs, detects proxies, and uses blacklists to block malicious sources.

This approach ensures high effectiveness and privacy compliance, offering a strong alternative to traditional CAPTCHA solutions.

More about effectiveness

ALTCHA vs Captcha Comparison

ALTCHA vs Captcha Comparison - Protection and Privacy Compliance

Latest News

Get started
with ALTCHA

Hosted

The easiest way to integrate ALTCHA into your websites or apps is through our SaaS platform. Simply create an account and follow the integration guides and documentation.

Open Source

For our free, open-source CAPTCHA alternative, check out the documentation to get started.

Do you like ALTCHA?
Support us by giving us a star on GitHub!

Crafted in EU
with Europeans in mind.
Element 1
Hosted by Hetzner, Germany.
CDN by bunny.net, Slovenia.
Servers powered by
green energy.