“vocabulary builder” App Store Keyword Difficulty

How is this difficulty score calculated?

Sonar's difficulty score (0–100) analyzes the top 10 apps ranking for “vocabulary builder” on the United States App Store as of Mar 11, 2026. It weighs title match quality (how many of the top apps use the keyword in their title), the install and review volumes of those apps, their average rating, and whether the keyword is dominated by established brands. A score of 0–30 means low competition, 30–60 moderate, and 60–100 highly competitive. Read the full methodology.