Duolingo: Language Lessons vs Stone Identifier Rock Scanner
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
14M–60M
6k–23k
Rating
★ 4.69 (46M)
★ 4.10 (24k)
Pricing
Free + IAP
Free
Category
Education
Education
Released
13.0y ago
4.7y ago
Verdict: Duolingo: Language Lessons earns more — an estimated $23M–$96M/mo, versus $0/mo for Stone Identifier Rock Scanner.