People consistently underestimate how impaired they are. This isn't a moral failing — it's a neurological one. Alcohol impairs the very cognitive functions you'd use to assess your own impairment. The result: overdrinking, poor decisions, and sometimes dangerous situations.
Existing tools are either medical-grade (breathalyzers, clinical tests) or purely social (how many drinks?). Neither works in a real party context. We wanted something in between: fun, fast, and grounded in real science.
Each test in CUDOS targets a specific cognitive domain that research has shown to degrade measurably with alcohol — even at low blood alcohol concentrations.
Measures how fast the motor system responds to a visual cue. At BAC 0.05%, reaction time increases ~15%. At 0.08% (legal limit in many countries), ~50ms extra delay — enough to matter.
Mets et al., 2011 · Fillmore et al., 2002Selective attention — the ability to find a target among distractors — is impaired by alcohol from BAC 0.04%. The crowd grows harder with each round to amplify this effect.
Schweizer & Vogel-Sprott, 2008The Stroop task is one of the most replicated findings in cognitive psychology (over 700 studies). It directly tests inhibitory control — the prefrontal cortex function most affected by alcohol.
MacLeod, 1991 · Stroop, 1935Important: this app provides a relative measure, not an absolute BAC reading. Individual baseline reaction times vary, alcohol absorption varies, and phone hardware introduces ~50ms of touchscreen latency on top. The calibration targets are adjusted for phone use. For a true BAC reading, use a certified breathalyzer.
Built by a biotechnology engineering student at SUP'Biotech (Villejuif, France) as an MVP concept combining neuroscience, UX design, and data engineering.
Biotech engineering student specialising in neuro and cell biology. Python developer with background in data engineering.
CUDOS is an early MVP. Planned features include user accounts and history (track your baseline sober scores and compare them to tonight), party leaderboards (who in the room is most impaired?), and a memory test as a fourth game. A Flask + Supabase backend is in development.
CUDOS is for entertainment and informal self-awareness only. It is not a medical device, not a substitute for a certified breathalyzer, and not a basis for any legal determination of impairment. Do not use this app to decide whether it is safe to drive — never drink and drive.
If you or someone you know needs support with alcohol use, contact the SFA (France) or your local health authority.