Free Energy Level Tracker | Find Your Peak Hours
Track your energy levels throughout the day and discover your peak performance hours
Track Your Energy Patterns
- 1 Check in with your energy level every 1-2 hours
- 2 Tag activities that might affect your energy
- 3 Discover your peak hours and optimize your schedule
🔒 All data stays in your browser — nothing is sent to any server.
How's your energy right now?
Energy Timeline
Check-in Log
No check-ins for this day. Tap the button above to log your first!
How to Use This Tool
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1
Start your day by setting your morning energy level on the 1-10 scale
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2
Log energy check-ins every 1-2 hours throughout your day
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3
Optionally tag each check-in with an activity like meals, exercise, or meetings
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4
View your daily timeline to see energy peaks and dips visually
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5
Check the weekly patterns tab to discover your average peak hours
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6
Use the cognitive budget feature to plan high-effort tasks during peak hours
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7
Share your energy pattern summary or copy your insights to use in your own planning
Frequently Asked Questions
An energy level tracker is a tool that helps you log and visualize your physical and mental energy throughout the day. By recording how energized you feel at different times, you can identify patterns, find your peak performance hours, and schedule demanding tasks when you have the most energy.
For the best results, check in every 1-2 hours during your waking hours. This gives you enough data points to see clear patterns without being disruptive. Most people find 6-8 check-ins per day sufficient to identify their energy peaks and dips.
A cognitive energy budget treats your daily mental energy as a limited resource. You start with a set number of energy points each day and allocate them to tasks based on difficulty. This helps you prioritize high-effort work during peak hours and avoid burnout by not overscheduling demanding activities.
Schedule your most challenging, creative, or important work during your peak energy hours. Save routine, administrative, or less demanding tasks for your natural energy dips. Most people have 2-3 peak hours per day — using them wisely can dramatically improve productivity.
The biggest factor is your circadian rhythm — your body's internal clock that creates natural peaks and dips in alertness throughout the day. Beyond that, sleep quality, meal timing and nutrition, caffeine intake, physical activity, stress levels, hydration, and light exposure all play significant roles. This tracker lets you tag activities alongside energy levels so you can discover which factors impact your energy most.
All your energy data is stored locally in your browser using localStorage. Nothing is sent to any server. Your data stays completely private on your device. You can share a summary of your energy patterns or clear all data at any time.
A chronotype is your body's natural preference for when to sleep and wake. There are generally four types: Lion (early riser, peaks in the morning), Bear (follows the sun, peaks mid-morning — about 55% of people), Wolf (night owl, peaks in late afternoon/evening), and Dolphin (light sleeper, variable peaks). Knowing your chronotype helps you predict your energy patterns before you even start tracking. Use this tool to confirm your type and find your exact peak hours.
This is likely due to ultradian rhythms — natural 90 to 120 minute cycles of alertness and fatigue that repeat throughout the day. During each cycle, your brain moves from high focus to a recovery phase. Instead of fighting the dip, plan short 15-20 minute breaks between focused work sessions. This tracker helps you see these cycles in your daily timeline so you can work with them, not against them.
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