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AlgoArena can take still images from a participant's camera during an assessment. That happens only when the team running the assessment switches it on, and the participant has to allow camera access first. Nothing about the participant is ever inferred from the images.
Camera monitoring mostly flags honest people. Someone who looks away to think, or who works at an unusual desk, gets marked as suspicious. Planned cheating usually happens somewhere the camera can't see.
A camera flag also gives the evaluator nothing to check. They see a warning, but they can't confirm it or explain it to the person it is about.
So the integrity score uses events from the browser instead. Each one can be counted, and the report links each deduction to the replay.
The score comes from four browser signals. None of them is biometric, meaning none is measured from a person's face or body. The score is a fixed formula with no AI model in it, so the same session always gets the same number.
How much code was pasted instead of typed, and whether a paste looks like AI output.
How often the participant left the assessment tab, and whether the switches came in a burst.
How often the browser window lost focus. It counts for little, since people get interrupted.
Whether a second display was connected during the session, in browsers that support it (Chrome and Edge).
Every deduction on the report comes with its reason, for example "14 tab switches (burst of 6)". The evaluator can open the replay at that point and judge it. The score is advice and never rejects a participant on its own.
Agentic questions get no integrity score. On those questions, pasting AI output is part of the work.
None of these is available as a setting or on request.
When a team turns snapshots on, the images go only to that team. No model looks at them, and they don't change a participant's score.
Before the timer starts, the participant is told that the camera will take still images and won't record video. The browser then asks for camera permission. Images are taken about once a minute.
Each session keeps a limited number of images. Only the team running the assessment can view them, and no automated system reviews them.
A nightly job deletes the images once the team has recorded a decision and its retention period has passed. In every case, they are deleted within three years.
Teams are responsible for any consent or notice that their local laws require for camera use.
The integrity score sits beside the work and never replaces it.