FSRS vs SM-2: what changed in spaced repetition
SM-2 multiplies your last gap by an ease factor. FSRS models your memory and aims for 90% recall. How they differ, in real days from both schedulers.
FlashLoop blog
Learn words you can actually use.
Practical guides to learning vocabulary that sticks: active recall, spaced repetition, context and the habits that make new words usable.