SilentShield is an invisible, GDPR-compliant CAPTCHA alternative to Google reCAPTCHA, Cloudflare Turnstile, and hCaptcha. Instead of image puzzles, it verifies users through behavioral analysis and a proof-of-work nonce — with no cookies, tracking, or personal data. Every plan hosts data in the EU by default, meets WCAG 2.1 AA, and installs with a single API key.
Comparison & Use Cases
See how SilentShield compares to reCAPTCHA, Turnstile, and hCaptcha
SilentShield vs. Competitors
| Feature | SilentShield | reCAPTCHA | Turnstile | hCaptcha |
|---|---|---|---|---|
| User Experience | Fully invisible | Image puzzles required | Sometimes challenges | Visible puzzles (default) |
| Privacy (GDPR) | Fully compliant | Data shared with Google | Bound to Cloudflare ecosystem | External data processing |
| Accessibility | WCAG 2.1 AA | Limited | Partial | Limited |
| Bot Detection | Proof-of-Work + ML | Behavioral analysis | Browser challenge | Image recognition |
| Load Time | Very low | High | Medium | Very high |
| Cookies | None | Yes | Minimal | Yes |
| EU Hosting | Yes, guaranteed | No (US) | Optional | Optional |
| Integration | < 5 min | ~10 min | ~10 min | ~15 min |
Use Cases
Contact Forms
Protect your contact forms from spam without losing real inquiries
No more spam emails
No user frustration
Higher conversion rate
More completed form submissions
Login & Registration
Prevent brute-force attacks and bot registrations
Account takeover protection
No fake accounts
Seamless user experience
Significantly fewer bot registrations
E-Commerce & Checkout
Stop cart bots and protect limited drops
Fair product availability
Scalping protection
Higher checkout completion
Higher checkout completion
APIs & Webhooks
Rate limiting and bot protection for your backend endpoints
DDoS protection
Reduced server costs
Prevent API abuse
Significantly fewer invalid API calls
ROI & Performance Gains
Typical improvements after switching to SilentShield
Higher
Conversion Rate
Fewer drop-offs from CAPTCHA frustration
Fewer
Support Tickets
Fewer CAPTCHA-related issues
Faster
Load Time
Faster page performance
More effective
Bot Blocking
More effective bot detection
Detailed Comparison
Why SilentShield?
- 100% invisible: No interruption of the user flow
- GDPR compliant: All data stays in the EU
- No cookies: No cookie banner needed
- Accessible: Works for all users
- Fast: Minimal performance impact
Problems with other solutions
- reCAPTCHA: Google tracking, privacy issues, annoying image puzzles
- Turnstile: Cloudflare dependency, sometimes visible
- hCaptcha: Mostly visible puzzles, higher abandonment
- All: Cookies required, external data processing
- All: Accessibility issues for people with disabilities
Try the Live Demo
Interact with the form below — watch SilentShield analyze your behavior in real-time.
your-website.com/contact
Behavior Analysis
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Mouse Movement0%
Keyboard Input0%
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Start interacting with the form to see the analysis.
Related pages
GDPR-compliant CAPTCHAThe invisible, cookie-free CAPTCHA built for GDPR.GDPR-compliant reCAPTCHA alternativeSee how SilentShield replaces Google reCAPTCHA — invisibly and without cookies.hCaptcha alternativeSwitch from hCaptcha to invisible, EU-hosted bot protection.Cloudflare Turnstile alternativeAn invisible Turnstile alternative that isn't tied to Cloudflare.Friendly Captcha alternativeFully invisible, EU-hosted protection with no visible widget.
Frequently asked questions
How does SilentShield compare to other CAPTCHAs?
SilentShield is invisible, EU-hosted and GDPR-compliant, using behavioral signals plus a proof-of-work nonce instead of image puzzles. Unlike reCAPTCHA it sends no data to Google; unlike hCaptcha and Friendly Captcha it shows no visible widget. It sets no cookies and stores only pseudonymised data.
SilentShield vs reCAPTCHA — which is better for privacy?
SilentShield is designed for privacy: EU hosting, no cookies, no tracking, and pseudonymised data only. reCAPTCHA sends data to Google and typically requires cookie consent. SilentShield also shows no image puzzles and meets WCAG 2.1 AA, so it avoids reCAPTCHA's accessibility and consent trade-offs.
SilentShield vs hCaptcha — what is the difference?
Both aim for privacy, but hCaptcha still shows a visible widget and can present challenges. SilentShield is invisible by default, using behavioral signals and a proof-of-work nonce, and hosts data in the EU with no cookies. Real users never see or solve a challenge.
SilentShield vs Cloudflare Turnstile — how do they differ?
Both are invisible, but Turnstile is tied to Cloudflare's infrastructure and account. SilentShield is independent and EU-hosted on every plan, integrates via a single API key with a client script and backend nonce verification, and stores only pseudonymised data with no cookies.
Which CAPTCHA is best for GDPR compliance?
A CAPTCHA that hosts data in the EU, sets no cookies and stores no personal data is easiest to keep GDPR-compliant. SilentShield does all three by default: EU hosting, no tracking cookies, pseudonymised data only, and no transfer to Google — so it typically needs no consent banner.
Do invisible CAPTCHAs like SilentShield block real users?
No. SilentShield verifies genuine visitors invisibly through behavioral signals and a proof-of-work nonce, so real users pass without solving anything. Only your backend's verification of the nonce at the /v1/verify endpoint decides the outcome, and legitimate traffic is designed to pass without friction.