https://github.com/xiety/anki_history_visualizer
Shift+Click to select deck in main Anki window
Main menu: Tools | Visualize History
Report bugs to https://github.com/xiety/anki_history_visualizer/issues
You can click on a circle or a square to see the card's preview at the bottom.
Circles

The size of the ball is the total number of reviews. The color of the ball is the stability.
The maximum height the ball jumps is the stability too.
The bottom of the screen is the current day's reviews.
The ball falls to the bottom, you review it, and it jumps back to the height of it's current stability.
You can click on a circle to see the card's preview at the bottom.
Squares

Review colors: Red - Again, Dark Green - Hard, Green - Good, Yellow - Easy
The more stable, the more purple the square.
You can click on a square to see the card's preview at the bottom.
Future Due

Colors: Red - Again, Dark Green - Hard, Green - Good, Yellow - Easy, Dark cyan - New card
The more stable, the more purple the square.
Stars

Changelog:
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01.10.2025 v0.7 - Revlogs and Bars visualizations
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18.01.2025 v0.6 - Stars visualization
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16.11.2024 v0.5 - Future Due visualization
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09.07.2024 v0.4 - Square visualization, animation speed, open card info
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04.07.2024 v0.3 - Ball size and day height parameters, parent decks support, window resize support
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03.07.2024 v0.2 - Hover to show card info, click to open card browser, play button, horizontal lines
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02.07.2024 v0.1 - Initial prototype