Damage Numbers Add-on 1.21+

Keep track of every point of damage — with this mod, damage becomes visible. Damage Numbers is an updated version of the popular Minecraft add-on, now using particles instead of entities for maximum optimization. When you deal or heal damage, floating numbers will appear right on your screen, and a flexible settings system allows each player to customize the display style to their liking.

Right after spawning, you will have items to customize the add-on:

Number Lifetime — duration of number display

Font changes the font

Heal Color R/G/B changes the healing color

Damage Color R/G/B changes the damage color

If for some reason the item is lost, it can be crafted.

Global settings: /function damagenumbers/admin_settings.