Protect your public webhooks
Use our URL to keep your webhook private and receive only submissions that passed CAPTCHA and rate-limit checks
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.
Use our URL instead
We absorb spam and abuse before it reaches you. Check docs
Use only Private Captcha API URL in your form destination
We check CAPTCHA solution and rate limit submissions
We forward submissions only from real users to your actual URL
Use anywhere
How can you use it
- Contact forms
- Let visitors send messages while bots hit a protected URL instead.
- Booking forms
- Reduce fake bookings with CAPTCHA and rate-limit checks first.
- 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.
- Order form
- Reduce fake orders by verifying users before your webhook is called.
- IFTTT triggers
- Add CAPTCHA and rate limits before your IFTTT applet runs.
- N8N webhooks
- Verify and rate-limit requests before they reach your n8n workflow.
- Make.com webhooks
- Protect Make.com automations from bots and unwanted requests.
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 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.
Protect your forms and APIs from abuse
Independent, privacy-first, self-hostable CAPTCHA service made in EU