I Used Data Viz (Chart.js) to Escape JEE Burnout. Now It Tracks My 'Perfect' Study Mood.

What's up, IH community!

As a gap year student prepping for the insanely tough JEE exam, I hit a massive wall: I was studying 10 hours a day, but I couldn't figure out when those hours were actually productive. My mood was wrecking my retention.

So, I built MindMapper.

This isn't just a to-do list; it's a Study Effectiveness Tracker that correlates my current mood (logged manually) with my performance and retention data.

The Simple Tech: Just JavaScript and Chart.js—no backend needed!

The Result: I discovered the exact emotional state and time of day where my learning retention spikes. It literally told me how to study smarter, not just longer.

Personal Problem Solved: This helped me survive the pressure of my parents wanting me to focus only on IIT.

I need your advice: The next step is adding an automated prompt system for logging mood (e.g., a Chrome Extension notification). How should I think about pricing a tool that saves students hundreds of hours? Should this be a free tool for students, or a premium SaaS?