The science of
knowing yourself.
Five validated tests. Five minutes. A few times a day maps your rhythm and shows what actually works. Not brain training. Real measurement.
The Battery
Five tests. Five cognitive dimensions.
Each test isolates a different cognitive function used in peer-reviewed research. Together, they paint a complete picture of how your brain is performing.
Simple Reaction Time
Reaction Time · Motor response latency
Your reaction time is the first thing to degrade when fatigued. Even mild sleep deprivation can add 20-50ms to your response time. That's enough to notice in daily life.
Lowe et al. (2017)·Meta-analysis: sustained attention shows largest fatigue effect
Psychomotor Vigilance
Vigilance · Sustained attention, lapse detection
Lapses (responses over 450ms) predict real-world errors like missing a stop sign or losing focus in a meeting. The PVT is NASA's standard for astronaut readiness.
Basner & Dinges (2011)·Gold standard for fatigue detection
2-Back Task
Working Memory · Memory updating, interference resistance
Working memory is the mental workspace for complex thought. It's limited and easily disrupted by stress, sleep debt, or cognitive overload.
Hepdarcan & Can (2025)·High test-retest reliability across age groups
Stroop Test
Executive Function · Inhibitory control, cognitive flexibility
The Stroop effect reveals how your brain handles conflicting information. Poor cognitive control often leads to impulsive decisions and reduced focus.
Cain et al. (2011)·Executive control under sleep deprivation
Symbol Substitution
Processing Speed · Cognitive throughput, pattern matching
Sensitive to nearly any cognitive impairment. If something is affecting your brain, whether sleep, substances, or stress, the DSST will catch it.
Williamson et al. (2023)·Validated for cognitive impairment detection
All that. Five minutes.
A complete cognitive assessment in less time than a coffee break.
No sign-up required · Results saved locally
The Method
Real science. Personal insights.
Your baseline, not averages.
Population norms hide individual patterns. We compare you to yourself using exponentially weighted moving averages and live variance tracking that adapts as you change.
Your score, not a percentage.
Your Thalen Score is an Elo-style rating starting at 1500, like chess rankings. It reflects your absolute cognitive ability and it grows as you do. New users typically climb 100-200 points in their first few weeks as they master the tests. Above 1500? You're sharper than average. Pushing toward 2000? You're approaching elite.
Signal, not noise.
We map your circadian rhythm from session one using Bayesian cosinor analysis. The model starts with population data, then shifts to your personal pattern as you test. It captures your daily cycle and the post-lunch dip, and adjusts over time as your habits change.
Scores from day one. Calibrated by day 30.
You see your Thalen Score immediately. The first two weeks wash out learning effects. Day 21 unlocks your personal circadian curve: when you peak and when you dip. By day 30, your baseline is fully calibrated and you see trends across weeks and months.
Research-grade, not brain games.
These aren't gamified distractions. They're the same validated tests used in cognitive research, sleep labs, and clinical trials for decades, now calibrated to your personal baseline.
Frequently Asked Questions
Common questions about cognitive tracking
Everything you need to know about measuring and understanding your cognitive performance.
Get early access.
Thalen is coming to iOS first. Join the TestFlight beta and start building your cognitive baseline.
Free. Your data stays on your device. No account required.