CISSP Exam Prep & Test 2025 vs Duolingo: Language Lessons
A data-backed head-to-head — estimated revenue, downloads, ratings and pricing side by side, from live App Store signals. Updated continuously.
Revenue / mo
$200–$1k
$5.1M–$21M
Downloads / mo
200–1k
3.4M–14M
Rating
★ 4.92 (261)
★ 4.73 (5.3M)
Pricing
Free + IAP
Free + IAP
Category
Education
Education
Released
2.1y ago
13.6y ago
Verdict: Duolingo: Language Lessons earns more — an estimated $5.1M–$21M/mo, versus $200–$1k/mo for CISSP Exam Prep & Test 2025.