A worked example
Use JSON when changing browsers to retain progress; use CSV when preparing cards in a spreadsheet.
Export plain-text CSV or a JSON deck with review progress, and restore after validation.
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JSON keeps review progress and exact text. CSV prefixes formula-like cells with an apostrophe for spreadsheet safety. Imports replace this deck after confirmation.
Up to 200 cards. Review dates follow this device’s local calendar. Export a backup before clearing site data.
JSON preserves IDs, boxes, due dates and review totals. CSV preserves the front, back and tag only.
Use JSON when changing browsers to retain progress; use CSV when preparing cards in a spreadsheet.
Cards and progress stay in this browser. Export before clearing site data or changing devices.
No. Processing runs locally in your browser. The host still receives normal requests for website pages and assets.
Use the download controls for the current tool or print from your browser. Seating plans, flashcards and document drafts autosave in this browser; see the privacy page.
No sign-up, paid API or subscription is required. Both languages use the same tools. English always opens at the root address.
Write questions and answers, add tags and import a two-column CSV deck.
Open toolRecall the answer, flip the card and choose Again, Good or Easy to schedule its next review.
Open toolSee due cards, box distribution and the next seven calendar days of reviews.
Open tool