ThinkLeft
Cognitive Fatigue & Focus
Only for iPhone
Free · In-App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
ThinkLeft tracks your cognitive fatigue so you make better decisions at the right time of day.
Your brain doesn't run at full power all day. Every decision — what to eat, which email to answer, whether to take that meeting — drains mental energy. ThinkLeft scores your cognitive load in real time so you can see exactly when you're sharp and when you're running on fumes.
KEY FEATURES
• Real-Time Fatigue Score — A 0–100 score updated throughout the day based on 4 signals: decisions made, time of day, fidgeting (restlessness), and app hopping (context switching).
• Peak Hour Detection — Know your personal peak focus window and afternoon slump based on your wake time and daily patterns.
• One-Tap Decision Logger — Track important decisions in under 2 seconds. Look back and spot the hours you decide best.
• Weekly Insights — See your peak days, average scores, and decision volume patterns over time.
• Focus Mode — Hide the score when you just want to work without obsessing over the number.
• Schedule Profiles — Early Bird, Standard, Night Owl, Night Shift, and Custom wake times shift the fatigue curve to match your life.
• Personal Baseline — After a few days of use, ThinkLeft calibrates to your normal range so the score is relative to you.
• Home Screen Widget — Glance at your current fatigue score without opening the app.
Stop guessing when to tackle hard decisions. Know when your brain is ready.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
v1.0.4 — Your clock, your patterns
Decision Quality (new hero)
See the hours you make sharp calls vs. regrets. Hour-by-hour quality bars, best-hour and riskiest-hour callouts, and day-of-week patterns — all from your own outcome ratings.
Decision journal
Add a quick reflection after rating any decision. Your past notes show up inline so you can spot what worked.
Smarter Delay Mode
When you pause before a heavy decision, we now suggest a better time today based on your circadian peak.
"Should I Decide Now?" widget
New home-screen widget gives a one-glance YES / MAYBE / WAIT based on your live fatigue.
Meeting cost estimate
Calendar warnings now show the cognitive cost of your flagged meetings and suggest your sharpest window for rescheduling.
Spotify-Wrapped-style weekly report
Your weekly brain report now has a headline vibe and standout badges (Iron Streak, Focused Week, Recovery Master). Share it with one tap.
Built around your clock
Your fatigue curve is calibrated to your wake time, not a 9-to-5 default. Early risers, night owls, shift workers — all get a personalized curve.
The developer, Jean Gonzalez, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Jean Gonzalez
- Size
- 5.3 MB
- Category
- Productivity
- Compatibility
Requires iOS 18.6 or later.
- iPhone
Requires iOS 18.6 or later. - Mac
Requires macOS 15.6 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.6 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Pro Yearly $19.99
- Pro Monthly $2.99
- Pro Lifetime $39.99
- Copyright
- © 2026 Jc Gonzo