Interactive and free

The Night Toolkit

Three small instruments for engineering a better night: chart your caffeine, plan your sleep window, and learn your chronotype. No account, no tracking of your answers, nothing leaves your browser.

01Flagship visualizer

Caffeine curve

Log your day of coffee and tea, set a bedtime, and watch the decay curve reveal how many milligrams are still circulating when the lights go out.

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02Planner

Sleep window planner

Work backwards from your alarm in whole ~90 minute cycles to bedtime windows that fit the recommended range for your age.

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03Self-check

Chronotype self-check

Eight original questions place you on the lark-owl spectrum and turn your timing preference into practical schedule tactics.

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