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ThinkLeft
Know when your brain is sharp. Track fatigue.
Every decision drains mental energy — but most people have no idea when their brain is actually running on fumes. ThinkLeft gives you a real-time 0–100 cognitive fatigue score based on 4 signals: decisions made, time of day, fidgeting, and app hopping. After a few days it calibrates to YOUR baseline — so you see your personal peak hours and afternoon slump, not a generic average. Free. iPhone only.
Top comment
Hey hunters — I built this because I kept making bad decisions in the afternoon and had no way to confirm it. Turns out there's solid science behind decision fatigue, I just needed a personal dashboard. The score updates throughout the day using passive signals (motion, app switching) + decisions you log in under 2 seconds. After a few days it learns your baseline. Would love any feedback — especially on what signals you'd want added next.
About ThinkLeft on Product Hunt
“Know when your brain is sharp. Track fatigue.”
ThinkLeft was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #109 on the daily leaderboard. Every decision drains mental energy — but most people have no idea when their brain is actually running on fumes. ThinkLeft gives you a real-time 0–100 cognitive fatigue score based on 4 signals: decisions made, time of day, fidgeting, and app hopping. After a few days it calibrates to YOUR baseline — so you see your personal peak hours and afternoon slump, not a generic average. Free. iPhone only.
On the analytics side, ThinkLeft competes within Health & Fitness and Productivity — topics that collectively have 733.3k followers on Product Hunt. The dashboard above tracks how ThinkLeft performed against the three products that launched closest to it on the same day.
Who hunted ThinkLeft?
ThinkLeft was hunted by JC GONZO. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of ThinkLeft including community comment highlights and product details, visit the product overview.