ColorCraft

Skill-up levels: under the selected recipe's name, "Skill-Ups: 50 75 100" shows the skill levels where it turns yellow, green and gray, each number in its color. Hover it to see the same in words. The numbers come from the game's own data.

You can turn it off in Options > AddOns > ColorCraft > Show Skill-Up Levels. It starts on.

After updating, fully close and restart the game once: 1.1.0 adds a new file, and a /reload alone does not load it.

Thanks to mrkhaglund for the idea.