Language-learning app Duolingo is down for millions of people around the world.
The problems started at around 2pm and are affecting users worldwide, according to Down Detector.
More than 430 issues have been logged in the US, while over 100 users in the UK are reporting problems with the app.
Although the reason for the outage remains clear, 87% of users have reported having problems with the app, while 5% said they were having trouble with the courses.
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