I replaced CAPTCHA with passive biometrics after AI hit 91% bypass rate — 7 biological signals, no puzzles, free tier

CAPTCHA is broken

AI now bypasses reCAPTCHA at 91%+ success rates. Every

CAPTCHA you add costs you 17-29% conversion. It is a

bad trade that gets worse every year.

What I built

ANIMA collects 7 passive biological signals during normal

page interaction — no puzzle, no challenge, no user friction:

1. Neuromotor tremor (8-12 Hz motor neuron oscillation)


2. Inter-tap interval variance (stochastic neural timing)


3. Associative response latency (cognitive processing time)


4. Pointer dynamics (Fitts' Law biomechanics)


5. Scroll behavior entropy (Shannon entropy of scroll patterns)


6. Device motion (accelerometer signatures)


7. Cross-signal correlation

These are physical properties of biological nervous systems.

AI cannot fake a tremor without simulating motor neurons.

How it works

One script tag. Verification runs in 0.4 seconds invisibly.

Returns a signed JWT with a confidence score. You verify

the token server-side before processing any form submission.

html

<script src="https://animaid.to/sdk/v3/anima.js"

  data-anima-key="your_key" async></script>