[Question] What are the best tools for recording predictions?

Preferably, follow rules from “Best Textbooks in any Subject.” I’m interested in people who have tried 2-3 prediction-recording tools, and can argue why one is better than the others.

I’ve decided I finally want to get gud at calibration.

I’m personally just interested in tracking my own predictions, often about private things. I’d prefer something very low-friction where I can record my own predictions, mark them as true/​false later on using my own judgment, and automatically see a graph of how calibrated I am.