Protect your
public webhooks
Use our URL to keep your webhook private and receive only submissions that passed CAPTCHA and rate-limit checks
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Your form is a honeypot
Everyone can see where form submissions are sent. But you can use Private Captcha URL instead and have a peace of mind.
Security
Use our URL instead
Every form submission passes through user-friendly CAPTCHA and rate-limit checks before it reaches you. Docs
2. We check captcha
3. Receive verified submissions
Flexibility
Where you can use it
Contact forms
Let visitors send messages while bots hit a protected URL instead.
N8N webhooks
Verify and rate-limit requests before they reach your n8n workflow.
Firebase functions
Protect Firebase functions from DoS and bill spikes.
Lead capture forms
Keep low-quality bot leads away from your CRM or sales workflow.
AI Chatbots
Verify users before chatbot messages reach your backend workflow.
IFTTT triggers
Add CAPTCHA and rate limits before your IFTTT applet runs.
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