Duolingo: Language Lessons vs Solar System Viewer: 8Planets
A data-backed head-to-head — estimated revenue, downloads, ratings and pricing side by side, from live App Store signals. Updated continuously.
Revenue / mo
$9.6M–$32M
$5–$90
Downloads / mo
2.5M–11M
10–60
Rating
★ 4.72 (5.4M)
★ 4.39 (28)
Pricing
Free + IAP
Paid $0.99
Category
Education
Education
Released
13.7y ago
5.4y ago
Verdict: Duolingo: Language Lessons earns more — an estimated $9.6M–$32M/mo, versus $5–$90/mo for Solar System Viewer: 8Planets.