You earn crystals as you complete lessons. You can buy more from the Shop tab

You can join language clubs to practice with other learners

Duolingo Plus lets you download lessons offline and removes ad. You can start with a 7 day trial

It quizzes you with audio and visual questions to make you understand and to increase recall

During login, it asks for your age, name, email and password

The splash screen is the logo on a green background

There are posts by other learners and mini "games" that help you test your skills

First lesson complete. It shows your learning minutes and asks you to create a profile

Gamification badges and progress

Changing daily goal - words per day

Library and In app purchase to get Tingles Premium

Duolingo Plus lets you download lessons offline and removes ad. You can start with a 7 day trial

Memrise Pro in app purchase