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

Add friends to compete with. You can search by name or find them from facebook

Profile and settings

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

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

Bottom sheet for wrong answer

Achievement leveled up modal

You can tap the country flag on top to add more languages and switch between them

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

Buy Ethereum via Simplex

Daily goal completed

Levels of gamification

In app purchase to buy track effects