FSRS by default. Mobile-first. Free on iOS and Android, with no account, no cloud, no tracking — everything stays on your device. Install to first review takes 30 seconds: no decks, no ease factors, no sync setup. Memory health is tracked across four stages (New → Fragile → Stable → Strong) instead of streaks. The science of spaced repetition, set up so the only thing you have to learn is the habit.
