FSRS Scheduling Visualizer

Raw FSRS · the “on-time” student (every review fires exactly when the card is due) · vendored

Request retention

90%

Jitter enable fuzz

Trajectory

Two questions, two views. Bars below: press a button → that’s how far off the next review is (bar length = size of the gap). Line above: every review you commit plots its interval on a log scale — press Good again and again and watch the line climb as the gap compounds. The colored fork on the right is your four options for the next review.

your committed reviews (the climb) the four next options (the fork) y = interval, log scale · x = review number

Current card

Review trail

click a row to rewind here

#	Grade	Day	Interval	State	S	D

Advanced parameters

Learning steps

Max interval (days)

Model weights (w) · read-only

These weights are FSRS — a real deployment fits them to a learner’s own review history. Editing them is deferred; tweak retention and the steps above to build intuition.