CardLoop — Spaced-Repetition Flashcards

About

CardLoop turns anything worth remembering into flashcards and schedules each review for the moment you're about to forget — using the proven SM-2 spaced-repetition algorithm Anki made famous. Unlike the popular study apps, it needs no account, no cloud and no AI: every card lives only in your browser.

What you can do:
• Capture anywhere — select text on any page, right-click “Add to CardLoop”, and it becomes a card (no page access required).
• Two card types — classic front/back, or fill-in-the-blank cloze deletions ({{c1::like this}}) with a one-click cloze toolbar and a live question/answer preview.
• Real spaced repetition — an SM-2 scheduler shows hard cards often and easy ones rarely, with Again / Hard / Good / Easy grading and next-interval previews.
• Stay organized — colored decks, tags, full-text search, and filters by state (new, learning, young, mature, suspended).
• See progress — review heatmap (last 13 weeks), day streak, retention %, card-maturity breakdown, a 7-day “what's due” forecast and per-deck stats.
• Study your way — a quick side-panel hub, a focused full-page study mode, and an options screen; fully keyboard-driven (Space to flip, 1–4 to grade).
• Own your data — export a full JSON backup, paste-import lists from Quizlet/Anki/CSV, export TSV for Anki, or reset everything in one click.

Private by design: CardLoop requests only `storage`, `sidePanel`, `contextMenus` and `alarms`. There are NO host permissions, NO network requests, NO content scripts, NO tracking and NO account. Light & dark themes included. Open it with Alt+Shift+L.