Protect your forms from spam and abuse

Private Captcha is a privacy-first protection that is simple to use and powerful under the hood.

No CAPTCHA? They tried.

Usually it is not personal, but if your forms have no protection, it's a matter of time until bots find them. And then this happens.

Wasted time: Cleaning up the mess, created by bots, tends to be quite annoying. Not only you will have to separate real users from bots, but also deal with backups and external providers.
Economic impact: Even if you're not using serverless technologies, submissions by bots tend to come in dozens, costing you in bandwidth, database, and compute resources.
Service disruption: The largest public side-effect of bot abuse is, of course, disruption of the service that legitimate users rely upon. Don't let bots to ruin the hard-earned trust.

Peace of mind in just a few minutes

Ready integrations

Works with most popular platforms and frameworks

Copy the 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>

Extensive documentation for developers

Popular use-cases, copy-paste examples and detailed API specifications

Real human support

We strive to address all support requests within 24 business hours. No AI chatbots.

Frequently Asked Questions

How does Private Captcha technology work?

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.

How does Private Captcha tell bots and users apart?

On scale, bots exhibit different usage patterns and fingerprints statistics than real users. Detection of those patterns is part of the Private Captcha solution.

How Private Captcha is different from other Proof-of-Work solutions?

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.

How do I add Private Captcha on my website?

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.

Can we use Private Captcha if our compliance requires strict EU-only data sovereignty?

Private Captcha is powered by exclusively European suppliers. If you want to ensure that no data is transferred to other countries due to geographic routing, you can also use our EU-only API endpoints.

Can I customize how the Private Captcha widget looks like?

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.

Compare with others

User-friendly
Humans don’t need to prove they’re human
GDPR-compliant
Self-hosting
Difficulty scaling
The more bots try, the harder it gets
EU-only endpoints
Real Human support
No AI chatbots ever

Google reCAPTCHA

Grey area (at best)

Private Captcha

CloudFlare Turnstile

Quite likely
Enterprise tier only

Protect your forms and APIs from abuse

Independent, privacy-first, self-hostable CAPTCHA service made in EU