Available on the App Store · iOS
Know your peak.
Skip the crash.
Log a coffee and see how it plays out: when you'll be sharpest, when the crash is coming, and how late is too late for another cup.
How it works
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1
Take a short quiz
Weight, age, and how coffee actually hits you. That tunes the curve to your body.
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2
Log your drinks
From your favorites, our database, or a barcode scan. A cold brew sipped over two hours behaves differently than a quick espresso.
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3
Read your curve
See when you're at your sharpest, when the crash starts, and how much caffeine will still be around at bedtime.
Straight from the app
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Know your peak. Skip the crash.
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Sleep better tonight
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Calibrated to you, not the average
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Spot the patterns behind your energy
Free to start
Free Tier
Free
- Personal caffeine curve, calculated live
- Sleep readiness projection for tonight
- Body Signals: Tag jitters, focus, or crashes directly on your curve
- Daily limits & drink logging
PRO ENGINE
Stimly PRO
Optional Upgrade
- Metabolic archetype calibration (8 biological models)
- Tolerance reset insights & half-life tuning
- Long-term energy trends & PDF Wellness Export
The core tracker and body signal logging are free forever. PRO unlocks advanced metabolic calibration and tolerance insights.
Stay in your sweet spot
Available on the App Store for iOS.