Duolingo: Language Lessons vs Guernsey Theory Test Suite
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–$95M
$0
Downloads / mo
4.1M–17M
10–50
Rating
★ 4.73 (5.2M)
★ 2.84 (19)
Pricing
Free + IAP
Paid
Category
Education
Education
Released
13.6y ago
7.0y ago