Memory Heatmap is a Knowledge aApp in the remio App Market.

What it does. See what parts of your knowledge life are alive vs dead. A visual heatmap of every topic in your KB, color-coded by heat (recency × frequency). Watch topics warm up or cool down week-over-week. One tap revives any dead…

How it fits remio. Knowledge aApps help you find, organize, and reuse notes, clips, meetings, and files you already keep in remio. After you install Memory Heatmap, it runs next to your notes, clips, and saved pages.

Memory Heatmap is published by AK Singh. The closest topic labels are knowledge and graph.