A few minutes a day. You get new words and the ones you are due to review, and your progress is saved on this device, with no account.
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Each day you get a few new words from your level, in syllabus order, plus the words you are due to review. Say the meaning to yourself, then tap Show answer.
If you knew it, the word comes back later: after 1 day, then 3, 7, 14 and 30 days. If not, it comes back at the end of today's session and again tomorrow. Words you already know can be skipped with I know this word.
In this browser on this device. Nothing is sent to us. Clearing your browser data, or using another phone or computer, starts you from the beginning.