About 2,720,000 results
Duolingo
Duolingo: Language Lessons - Apps on Google Play
Duolingo: Learn Spanish, French and other languages for free
Duolingo Help Center
How much does Duolingo cost? – Duolingo Help Center
Duolingo English Test
How to Use Duolingo for Language Learning
Duolingo English Test
Duolingo - Language Lessons on the App Store
Duolingo: Language Lessons - Apps on Google Play