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Duolingo vs Rosetta Stone vs Babbel (Which Language App Wins?)
The Best Language Learning Apps (and Why Most Don’t Work)
Is Duolingo Useful?
A Linguist explains how to make duolingo actually work
Babbel vs Duolingo Review (Which Language App Is Best?)
I did DUOLINGO for 800 days in a row
Polyglot Reacts to Popular Language Learning Apps
What happens after 365 days on Duolingo?