Waila Harvestability

Waila Harvestability is a client-side add-on for Waila or Hwyla, available for Forge on Minecraft 1.6.4–1.16.5. It shows whether you can currently harvest the block you're looking at, its required harvest level, and the effective tool type. Waila's module settings let you customize the display, and Tinkers' Construct isn't required.

Rent your own Minecraft server and install Waila Harvestability with one click from the panel, keeping in mind that its harvesting information is displayed client-side.