How Flipnem Schedules Your Cards
Flipnem uses FSRS (Free Spaced Repetition Scheduler), the same modern algorithm used by Anki. This page explains how scheduling works and one current limitation worth knowing.
What is FSRS?
FSRS schedules each card based on two things it tracks about you:
- Stability — how long you’ll likely remember this card before forgetting it
- Difficulty — how inherently hard this card is for you personally
When you rate a card (Again / Hard / Good / Easy), FSRS updates both values and calculates the next ideal review date. The goal is to show each card right before you’d forget it — maximizing retention while minimizing study time.
Your data is fully Anki-compatible
Your scheduling data — stability, difficulty, due dates, and review history — is stored in standard Anki format. You can import any .apkg file from Anki (scheduling preserved) and export your collection back at any time.
Current limitation: FSRS parameter optimization
FSRS uses 17 parameters that control how intervals are calculated. The defaults were tuned on large research datasets and work well for most learners.
Anki Desktop includes an FSRS Optimizer that can analyze your personal review history and fine-tune those parameters to match your memory patterns. Flipnem does not currently offer this optimization. Your cards are scheduled with standard FSRS defaults (or whatever parameters were set in an imported deck).
In practice, scheduling is correct and intervals are appropriate — this limitation mainly affects power users who have already run Anki’s optimizer and want continued personalization.
Workaround: Export your collection as .apkg, run the optimizer in Anki Desktop, and re-import. Your tuned parameters will be preserved in your collection.