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
$12M–$40M
$40–$800
Downloads / mo
6.6M–27M
7–30
Rating
★ 4.73 (48M)
★ 5.00 (—)
Pricing
Free + IAP
Paid $17.99
Category
Education
Education
Released
13.2y ago
—
Verdict: Duolingo: Language Lessons earns more — an estimated $12M–$40M/mo, versus $40–$800/mo for Guernsey Theory Test Suite.