Two kinds of product
How the money flows. Most of these products are freemium. Anyone can use a basic version for free, often with advertisements. Users pay a monthly or yearly subscription to remove the advertisements and unlock more. Only a small share of users pay, so the apps need very many users. To keep users coming back every day, many apps use game-like features, such as points and streaks: the count of days in a row a user has practised. The industry calls this gamification.

Why AI hits this market first. AI models translate, correct grammar, rewrite sentences and hold a conversation, in almost any language. Those are exactly the jobs these products were built to do. So this market is the one in education that AI changes most directly. A free AI chatbot now does much of what a paid writing tool did.

Every company named here has posted software engineering jobs in India. Famous companies that don't actively hire software engineers in India are left out.
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Apps that teach a language
Writing and study tools
Reading aloud
Language learners have always lacked someone to practise with. AI models now hold a conversation in any language, at any level. They correct pronunciation and explain grammar. The apps are becoming tutors. The harder question is whether people will still need to learn a language that AI can translate instantly.
Who these companies hire, and for what, is on What edtech companies hire for.