Flexi

Flexi removes the tedious part of vocabulary study: typing out cards. You enter a word or paste in your own list, and the app suggests up to five ready-made cards with translations, example sentences, parts of speech and audio pronunciation. You keep the ones you want and move on. Existing decks from Anki, Quizlet or CSV files import cleanly, so you do not lose years of accumulated progress.

Retention is handled by a spaced repetition system that surfaces each card just before you would forget it, pushing vocabulary into long-term memory rather than cramming for a single test. Pronunciation support spans 20+ languages with IPA, kana or pinyin displays, and an in-card AI tutor can answer questions or give feedback while you review — effectively a language mentor inside every flashcard.

Beyond the core loop, Flexi adds habit mechanics that matter for daily study: smart reminders, interactive home-screen widgets for saving words on the go, and the ability to generate a custom card set for any topic. The app reports 49k+ learners, 5M+ cards created and a 4.7 store rating, and reviewer feedback focuses on how quickly new words can be added and how well the algorithm times reviews.