Starts with Easy
Real users pass quickly with minimal friction
Your defense against traffic spikes
Private Captcha automatically adjusts challenge difficulty and, as request volume rises, naturally distributes traffic over time.
Our technology
How automatic difficulty scaling works
Challenges with higher difficulty require exponentially more resources to complete, quickly exhausting bots' capabilities.
Our system evaluates each interaction and increases difficulty only when needed
Goes to Hard
Bots face exponentially harder challenges that drain resources
Seamless process
Set Up in Minutes
Ready-to-Go Integrations
Works with most of popular platforms and frameworks
Drop-In Code
Plug-and-play, customizable widget code
<form>
<div class="private-captcha" data-sitekey="xyz"
data-started-callback="your-callback"
data-finished-callback="your-callback">
</div>
</form>
Private Captcha works very well and is easy to set up. We build websites with Statamic, so we created a Statamic addon for them to easily integrate Captcha in it.
Stable, Backward-Compatible API
We made a promise: your integrations won't break.
I was looking for an accessible, European, privacy-friendly solution to prevent bot signups that were harming my domain. Private Captcha turned out to be a perfect fit: quick setup, excellent documentation, and impeccable support whenever I had questions!
Human-to-Human Support
A real person replies to you within 24 business hours
See the difference
Compare with Private Captcha
Question zone
Frequently Asked Questions
Instead of asking users to solve complex puzzles or track their behavior, Private Captcha solves an invisible cryptographic task in the background. The system automatically adjusts the task difficulty, ensuring smooth access for real users while making it too costly for bots to attempt. Cryptographic task provides equal security regardless of bot's intelligence level, making it effective even as AI technology improves. Which is hard to say about image/sound recognition tasks of other captchas.
On scale, bots exhibit different usage patterns and fingerprints statistics than real users. Detection of those patterns is part of the Private Captcha solution.
Unlike other solutions, that only have client-side code open, Private Captcha's backend code is also publicly available, making it easy to verify how user data is handled. Additionally, you can host Private Captcha on premises inside your own organization.
Private Captcha comes with many pre-built integrations for popular online platforms, such as WordPress, and packages for many popular programming languages (Javascript, Python, etc.). Additionally, our documentation provides detailed setup and migration guides and integration examples.
The Private Captcha widget offers two color themes (light and dark) and also allows to do lower-level customization, using CSS, ensuring seamless integration with your website. Additionally, you can hide the captcha widget altogether and make your custom UI integration, all while keeping security benefits.
Protect Your Forms
And APIs From Abuse
Independent, privacy-first, user-friendly CAPTCHA service made in EU