Duolingo: Language Lessons vs UMD German Grammar Guide
A data-backed head-to-head — estimated revenue, downloads, ratings and pricing side by side, from live App Store signals. Updated continuously.
Revenue / mo
$23M–$96M
$0
Downloads / mo
3.8M–16M
1–4
Rating
★ 4.73 (5.2M)
★ 5.00 (2)
Pricing
Free + IAP
Free
Category
Education
Education
Released
13.6y ago
13.3y ago