The Difficulty is an indicator that shows you how difficult it is to rank for a keyword in the Top 10
This score is based on a scale from 1 to 100. The higher the score, the hardest it is to rank on that keyword in the Top 10.
To calculate a keyword’s Difficulty, we look at the App Power of the Top 10 apps which are ranking for that keyword. The higher those App Powers, the harder it will be to compete with them, the more difficult the keyword will be.
The Difficulty score varies according to the country and the language of the keyword.
You can also check our ASO blog for more insights on difficulty