Duolingo Max is listed under AI Tutors & Learning, in the Research & Learning category on Flocci AI Tools. AI roleplay and 'Explain My Answer'. It is freemium — a usable free tier with paid plans above it, and it lives at duolingo.com.
Duolingo Max is freemium: there is a free tier you can work in and paid plans above it. It is one of 391 freemium tools in the catalog, all labelled the same way so you are never surprised by a paywall.
Duolingo Max does 4 things the catalog singles out: Ai roleplay and 'explain my answer'; video-call practice with lily; gamified language learning; free tier plus max upgrade.
Google LearnLM is the closest free alternative: it sits in the same AI Tutors & Learning sub-category and is free. ChatGPT Study Mode, Khanmigo and Knowt also start free. The full list is on the alternatives page.
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