SilentShield is an invisible, GDPR-compliant CAPTCHA alternative that replaces image puzzles and checkboxes. It detects bots through behavioural analysis and a proof-of-work nonce, with no cookies and no cross-site tracking. Every plan stores data on our servers in Germany, the widget is tested against WCAG 2.1 AA, and there are free and paid plans behind a single API key.
Why SilentShield
Why Choose SilentShield?
Invisible bot protection built for privacy, accessibility and performance. No image puzzles, no cross-site tracking.
- EU hosting100% EU
- Cookies0
- Script< 10 KB
- GDPRArt. 28
The difference
Visible CAPTCHA vs. invisible protection
Drag the slider: the usual CAPTCHA puzzle on the left, SilentShield on the right — same form, zero friction.
What Sets SilentShield Apart
Made in Germany, hosted in Germany
The check of your visitors runs on our servers in Germany, and the data is stored there. Via the EU endpoint, requests reach them directly, with no CDN in between.
Zero Cookies, Zero Tracking
No cookies are set and no profiles are built. Fingerprinting can be switched off with Zero-PII mode.
No Profiles
SilentShield sets no cookies and builds no profiles; the IP address is used only for the check. Privacy by architecture, not by policy.
GDPR/DSGVO Compliant by Design
Built from the ground up for EU data protection law. Via the EU endpoint, the check runs without passing through third countries.
Widget tested against WCAG 2.1 AA
Tested automatically and by keyboard (as of 09/2026, no external audit). In the default mode there is no visual task to solve.
AI-Powered Behavior Analysis
Proof-of-work combined with behavioral signals detects bots without interrupting real users.
25 Languages Built-in
Native support for 25 languages out of the box. No translation files to manage.
Transparent pricing
Free tier includes 500 requests per month. Paid plans start at just 9 EUR/month.
How SilentShield Compares
| Feature | SilentShield | reCAPTCHA | hCaptcha | Turnstile | Friendly Captcha |
|---|---|---|---|---|---|
| Free plan | 500 req/mo | Up to 10,000 assessments/mo | Basic: free | Unlimited | Non-commercial only, 1,000 req/mo |
| Visibility to visitors | Invisible by default | Image challenges possible | Passive only Pro/Enterprise | Mode of your choice | Check in the background |
| Cookies | None | _GRECAPTCHA | not checked | Pre-clearance, if enabled | None |
| Accessibility | WCAG 2.1 AA tested | not checked | Accessible according to provider | WCAG 2.2 AA (according to provider) | WCAG 2.2 AA, TÜV (according to provider) |
| EU endpoint | Yes, servers in Germany | not checked | not checked | not checked | Yes (according to provider) |
| Transferred size (gzip) | 48.9 KB | v2: 423 KB · v3: 459 KB | 742 KB | 27.5 KB | not measured |
Provider details from their official documentation and pricing pages (cloud.google.com/recaptcha, hcaptcha.com, developers.cloudflare.com/turnstile, friendlycaptcha.com), checked on Oct 4, 2026. “not checked” means: no official source found. Transferred size: our own measurement of Sep 4, 2026 (SilentShield: Sep 23, 2026). Method and individual values
Try the Live Demo
Interact with the form below — watch SilentShield analyze your behavior in real-time.
Behavior Analysis
Start interacting with the form to see the analysis.
Ready to protect your site the right way?
Start free with 500 requests per month. No credit card, no cross-site tracking.
Frequently asked questions
Why choose SilentShield over other CAPTCHAs?
SilentShield is invisible by default, GDPR-compliant and stores data on our servers in Germany on every plan. It uses behavioural signals plus a proof-of-work nonce instead of image puzzles, sets no cookies and builds no profiles. Only when the result is unclear is there a short arithmetic task, and you integrate with a single API key.
What makes SilentShield GDPR-compliant?
SilentShield hosts data in the EU by default on every plan, sets no cookies, does no cross-site tracking and builds no profiles. The IP address is processed only for the check and not stored in plain text. Whether you need consent depends on the mode: in Zero-PII mode the widget does without fingerprint characteristics (canvas, WebGL, audio).
Is SilentShield accessible?
Yes. SilentShield meets WCAG 2.1 AA and shows no image puzzles or checkboxes, so it does not exclude users who struggle with visual challenges. Verification happens invisibly through behavioral signals and a proof-of-work nonce, keeping forms usable for everyone including assistive-technology users.
Does SilentShield slow down my site?
No. SilentShield loads a single lightweight client script from api.silentshield.io and verifies a proof-of-work nonce on your backend. There are no image assets to download and no third-party tracking calls, so it adds minimal overhead to page load and form submission.
How is SilentShield different from reCAPTCHA?
Unlike reCAPTCHA, SilentShield keeps data on our servers in Germany, sets no cookies, loads no scripts from Google and shows no image puzzle in the default mode. The IP address is stored only as a hash, and the widget is tested against WCAG 2.1 AA. You integrate with one API key rather than managing Google keys.
Do I need cookies or a consent banner?
Not for cookies: SilentShield sets none and does no cross-site tracking. Whether you need consent depends on the mode — in Zero-PII mode the widget does without fingerprint characteristics (canvas, WebGL, audio). Verification relies on behavioural signals and a proof-of-work nonce processed on our servers in Germany; the IP address is not stored in plain text.