Duolingo: Language Lessons vs Rock Identifier: Stone ID
A data-backed head-to-head — estimated revenue, downloads, ratings and pricing side by side, from live App Store signals. Updated continuously.
Revenue / mo
$3.1M–$11M
$59k–$320k
Downloads / mo
2.7M–12M
87k–350k
Rating
★ 4.72 (5.4M)
★ 4.65 (80k)
Pricing
Free + IAP
Free + IAP
Category
Education
Education
Released
13.8y ago
5.6y ago
Verdict: Duolingo: Language Lessons earns more — an estimated $3.1M–$11M/mo, versus $59k–$320k/mo for Rock Identifier: Stone ID.