Storage is used only when the tool explicitly describes browser-local, versioned, scoped, clearable, non-sensitive data.
Status: new · Interval: 1 day(s) · Next review: not scheduled
Use this scheduler after reviewing one flashcard. Enter the front and back text, rate recall quality from 0 to 3, and provide the current interval and stability values. The local processor selects an adjustment, calculates the next interval, advances a due date, and reports updated stability.
The result is an FSRS-inspired planning aid rather than a clinical or academic guarantee. It does not store cards, sync a deck, or know whether your answer was correct. Keep the card in your own study system and use the output as a suggested next review.
Quality is rounded and clamped to 0–3: Again, Hard, Good, and Easy. The adjustment factors are 0.5, 0.85, 1.35, and 1.85. The next interval is current interval multiplied by that factor plus one quarter of stability, rounded to one decimal and never below one day.
The due date advances by the rounded next interval in calendar days from the current local execution date. Updated stability equals stability multiplied by the same adjustment. Front and back text are displayed as entered.
Review quality names the selected factor. Next interval is the suggested delay, next due date is calendar-based, and updated stability is the adjusted memory value.
Because the due date depends on the current date, save the displayed date with the card if you need an audit trail.
Do not enter a percentage for quality; the supported range is 0 through 3.
Do not treat the date as permanent when rerunning later; it is recalculated from the execution date.
The tool does not store cards, grade answer correctness, or sync with a spaced-repetition app.
It is an FSRS-inspired local heuristic and may differ from your deck software.
[0.5, 0.85, 1.35, 1.85][quality]Quality 0–3 selects the factor for Again through Easy.
max(1, intervalDays × adjustment + stability / 4)The result is rounded to one decimal day.
stability × adjustmentThe output shows the adjusted value to one decimal place.
The due date uses the current execution date and is therefore time-dependent.
What happens with Good recall after 3 days?
Capital of France?
Paris
2
3
4
Adjustment 1.35 gives 5.05 days, shown as 5.1; updated stability is 5.4.
Good lengthens the interval while keeping the card in rotation.
What does quality 0 do?
Capital of France?
Paris
0
3
4
Adjustment 0.5 gives 2.5 days; updated stability is 2.0.
Again shortens the next review.
How does Easy change a 5-day interval?
Capital of France?
Paris
3
5
4
Adjustment 1.85 gives 10.9 days; updated stability is 7.4.
Easy produces the largest factor.
What is the result for Hard at a 2-day interval?
Capital of France?
Paris
1
2
4
Adjustment 0.85 gives 2.7 days; updated stability is 3.4.
Hard grows the interval more slowly than Good.
What if inputs are zero?
Capital of France?
Paris
2
0
0
Interval and stability are clamped to one; Good then gives 1.6 days and updated stability 1.4.
Minimums prevent an empty or negative schedule.
What if quality is 9?
Capital of France?
Paris
9
3
4
Quality is clamped to 3, so Easy adjustment 1.85 gives 5.05 days, shown as 5.1.
Out-of-range quality uses the nearest supported value.
Again; it selects factor 0.5.
Easy; it selects factor 1.85.
The current delay in days before this review.
A numeric memory-stability context used in the formula.
No. The result is clamped to at least one day.
It is based on the current execution date.
No. It only returns a local suggestion.
No. It is explicitly FSRS-inspired.
Storage is used only when the tool explicitly describes browser-local, versioned, scoped, clearable, non-sensitive data.
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