Every new account gets 100 free credits. Each homework upload uses 10 credits and becomes a full lesson: study notes, flashcards, a quiz, and the Flip Run game. Practice is unlimited after that.
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No. Credits stay in your account until you use them.
Only building a new lesson from your uploads. Studying, quizzes, flashcards, and games are free to repeat as many times as you want.
If Flip can't read your pages or the lesson fails to build, your credits go back to your account automatically.
A parent or guardian should make purchases for students under 18.