Lingvist is a language-learning app that teaches vocabulary with artificial intelligence and spaced repetition. Learners see real-life words with example sentences and grammar notes, and the system places each learner at a suitable level. A custom decks feature builds a course from words or text that the user supplies. The service runs in the browser and as iOS and Android apps. It serves individual learners, students, educators who use a classroom function, and businesses.
The operator is Lingvist Technologies OÜ, a private limited company with its registered office in Tallinn, Estonia, so the company is established in the EU. Its privacy policy names an Estonian supervisory authority and a data protection officer, but it does not say where personal data is stored or name a cloud hosting provider. The policy lists external processors for analytics, error reporting, A/B testing and payments, including Google, Apple, Mixpanel and Sentry. A European organisation should therefore confirm hosting regions and sub-processors in its contract. The app is not open source, and no self-hosted version is described.