This is a Duolingo Super subscription — the premium paid tier of the popular free language learning app.
DUOLINGO on your bank statement is a charge for Duolingo Super — the paid premium tier of Duolingo, the world's most popular language learning app. Duolingo itself is free to use; if you're being charged, you or someone using your device subscribed to the Super plan (previously called Duolingo Plus).
Duolingo Super removes all adverts, gives unlimited hearts (so mistakes don't slow down your learning), and adds progress quizzes and offline access. Monthly plans cost around £6.99/month; annual plans work out cheaper per month. Duolingo also sometimes offers a Family plan allowing up to 6 accounts to share a single Super subscription.
A common reason people don't recognise the charge is that Duolingo runs promotional free trials — typically two weeks — that convert automatically to a paid subscription. If you subscribed through the iPhone or Android app, the charge may not appear as DUOLINGO on your statement but as an Apple or Google Play charge instead.
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