If you arrived here searching for colorful heatmaps, you are probably looking for the Review Heatmap addon.
This add-on is not maintained anymore, and it may not work on newer Anki versions.
This addon adds a heatmap below the Anki deck browser that shows you % of reviews you did each day. The difference from Review Heatmap addon is that even if you did 1000 reviews that day, if you have 9000 reviews left to do, the heatmap will remain black. Only when you do 100% will it turn completely green, and counted in your streak.
Please note that for those who do your reviews on AnkiDroid, AnkiMobile or AnkiWeb, you will need to sync your reviews before the next day on your AnkiDesktop that this addon is installed on. The addon has to log the percentages, so even if you do all your reviews on mobile phones, the addon will not know unless you sync your ankiDesktop the same day.
The percentage of reviews done calculated by (cards done)/ (cards left * modifiers + cards done) * 100, at last time of that day you use Anki. (Modifiers: for new cards, 2.1, for others, 1.05)
Github Link
Credits
Idea and color scheme based on the Anki add-on Review Heatmap by Glutanimate.
Click here to support Glutanimate's work.
View the LICENSE file for full credit/license/copyright information