Health Bar (API) Add-on 1.21+

Mod Health Bar (API) adds a visual health indicator to Minecraft with multiple color levels. You'll be able to determine the damage level by the shade of the bar without having to look at numbers. The red zone means nearly depleted health, orange and yellow indicate a reduced reserve, green shows a stable condition, and blue demonstrates a high level of stamina. Indicators

🔴 Red — almost death

🟠 Orange — critical condition

🟡 Yellow — mild warning

🟢 Green — normal health

🔵 Blue — very high health reserve