Duolingo: Language Lessons vs Red Sheet: PDF Red Filter
A data-backed head-to-head — estimated revenue, downloads, ratings and pricing side by side, from live App Store signals. Updated continuously.
Revenue / mo
$10M–$35M
$2–$10
Downloads / mo
2.6M–11M
3–20
Rating
★ 4.73 (5.3M)
★ 4.20 (5)
Pricing
Free + IAP
Free + IAP
Category
Education
Education
Released
13.7y ago
4.9y ago
Verdict: Duolingo: Language Lessons earns more — an estimated $10M–$35M/mo, versus $2–$10/mo for Red Sheet: PDF Red Filter.