BotStop

Stop bots, not humans.

The digits are cut from the same TV static as the background and bounced across the field. Pause on any frame and there is nothing to read. Humans track the moving patch; bots need video, not OCR.

First frame of the captcha — indistinguishable static — Freeze time. All discernment is lost to noise.

BotStop captcha animation — Watch the sequence. The answer emerges over time.

Try it

Demo only — answers checked in the browser

Watch the static, enter the four digits you see, then verify. Production sites verify server-side.

Generate a fresh random static field for every challenge.
Cut the answer from that same field — not overlaid, the same pixels.
Move the cutout across the base static.
Verify server-side in production with TTL, rate limits, and HMAC.

Stop bots, not humans.

Single frame

In motion

Try it