What you do here
Eight named ways to study a deck, from typed recall to explaining it back. What matters is not the count — it is that every answer you give in any of them writes to the same record, and the return date is computed rather than chosen.
How it works
The date something comes back is computed by FSRS — the same open scheduler whose benchmark is linked below — and it runs on the server, so your phone and your laptop can never disagree about what is due.