I guess you want the Review Heatmap add-on.
You can download it from this link: https://github.com/glutanimate/review-heatmap/releases/download/v1.0.0-beta.1/review-heatmap-v1.0.0-beta.1-anki21.ankiaddon
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thank you very much! is there a platform where I can browse through all other add-ons?
Yes, there is: https://ankiweb.net/shared/addons/2.1
This particular add-on is not available there yet (officially, at least).
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nice! thank you mate, have a good one