ThinkLeft

ThinkLeft is a productivity app built for iPhone users who want to understand their mental energy levels. It was created by Jean Gonzalez to help people make better choices by tracking when their brain is most alert. The app works on the idea that the brain does not stay at full power all day. Every choice you make, from picking lunch to booking a meeting, uses up mental energy. ThinkLeft measures this mental load in real time and gives you a score that shows when you are sharp and when you are tired.

Benefits

ThinkLeft helps you avoid making important decisions when you are exhausted. It tracks four main signals to calculate your fatigue level. These signals include the number of decisions you make, the time of day, how much you are fidgeting, and how often you switch between apps. By knowing your personal peak focus hours, you can schedule hard tasks when your mind is clearest. The app also lets you log decisions quickly and rate their quality. This creates a journal that helps you see patterns in your thinking over time. A special focus mode hides the score so you can work without constantly checking the number. Weekly reports give you a summary of your brain performance with fun badges like Iron Streak or Recovery Master.

Use Cases

This tool is perfect for anyone who feels overwhelmed by too many choices or who struggles with afternoon slumps. You can use it to plan your day by moving difficult meetings to your sharpest hours. The app suggests the best time to pause before a big decision so you do not regret it later. It is also useful for shift workers or night owls because you can customize your wake time profile to match your schedule. The home screen widget gives you a quick yes or wait recommendation so you do not need to open the full app. It works well for students, professionals, and anyone who wants to improve their decision quality without needing a degree in psychology.

Pricing

ThinkLeft is available for free with optional upgrades. Users can buy a Pro Monthly subscription for $1.99. A Pro Yearly plan costs $14.99. There is also a Pro Lifetime option for $29.99. The free version allows basic usage while the paid versions unlock more detailed insights and features.

Vibes

Users who have tried the app say it helps them stop rushing through decisions. Many find the weekly reports motivating because they celebrate their focus streaks. People appreciate the ability to customize their wake time profiles since it respects different lifestyles. The one-tap decision logger is praised for being fast and easy to use. Some users note that the focus mode is a lifesaver when they want to work without the stress of watching their mental score drop.

Additional Information

The app requires iOS 18.6 or later on iPhone and macOS 15.6 or later on Mac with an Apple M1 chip or newer. Jean Gonzalez developed the app and stated that no user data is collected. The app is rated for ages 4 and up. Recent updates improved accuracy and added features like meeting cost estimates and smarter delay suggestions. The app is compatible with iPad Air 11 inch devices.