Try the checks

This demo runs in your browser. The work is real, and nothing is sent or saved.

Normal visitors

Invisible check

The browser solves a small proof-of-work in the background while signals are scored. There is nothing to click.

Suspicious traffic

Press and hold

A short hold on top of harder background work. It works with touch, mouse and keyboard.

Riskiest traffic

Slide puzzle

Slide the piece into place. Anyone who cannot drag, or misses three times, moves to a press and hold.

How this differs from the live service

  • The live service issues each challenge, checks the answer on its server, and scores the request. Here your browser does all of it, so a pass on this page proves nothing to anyone.
  • The live service normally runs the same search in WebAssembly. This page uses the JavaScript version, so live checks can finish sooner.
  • The puzzle picture is drawn on your device for this demo. On the live service it comes from the server, and the answer never reaches the browser.