All deck building, quizzing and scoring run locally in JavaScript. Your decks and study progress are stored only in your browser via localStorage, there is no account or tracking, and the page works offline after the first load. You can export a deck as CSV or JSON to back it up or move it, and delete everything at any time.

The Leitner system is a spaced-repetition method that groups flashcards into numbered boxes. In AnyTool Flashcard Quiz every card starts in box one, a correct answer moves it up one box toward box five (mastered), and a wrong answer drops it back to box one. Cards in lower boxes are shown first and more often, so the material you struggle with gets the most practice.

When you type an answer the tool lower-cases it, strips accents, ignores leading articles like “a” and “the” and removes punctuation, then compares it to the expected answer using Levenshtein similarity. An exact match is correct, a very close match is counted as correct, and anything else is marked wrong while showing the expected answer. An expected answer can also list several acceptable values, and you can always mark a graded answer as correct.

The tool imports CSV files with a term and definition column (a header row is detected automatically) and JSON decks exported from this tool, and tolerates common key names like front/back and question/answer. You can also paste many cards at once using colons, tabs, dashes, equals signs or Q:/A: blocks, then export any deck back to CSV or JSON for backup or sharing.