Review mode

Press R (or open the Review pill in the top bar) to start a focused study session. Review surfaces concepts that are due, prompts you to recall what you know, and reschedules them based on how you self-rate.

Nesso uses FSRS, a modern open-source successor to the SM-2 / Anki algorithm.

What gets reviewed

Each concept node carries its own FSRS state: stability, difficulty, due, lastReview, lastRating, and friends. A node is due when due <= now. New, unrated concepts default to due = 0, which means they show up immediately the first time you open Review.

The session queue is built fresh every time you open the overlay: all due nodes, sorted by urgency, in random order within the same due bucket.

Flow

For each due concept, Review:

1. Shows the concept title and a short recall prompt. Try to remember its definition, examples, and typed relations before revealing.
2. Waits for you to think, then click Reveal (or press Space).
3. Reveals the concept’s typed relations, examples, and image (the same panel you see in the Inspector).
4. You rate how it felt: Again, Hard, Good, Easy. Each button shows the predicted next interval under it (e.g. < 1d, 4d, 2mo).

FSRS then updates stability and difficulty, schedules the next due date, and Review advances to the next card. Done with the queue, the overlay closes. You’re caught up.

Tuning FSRS

Under Settings -> Learning -> Review:

Setting	What it does	Range
Target retention	Probability of correctly recalling a concept at its next review. Higher means more frequent reviews.	70% to 97%
Max interval	Longest interval FSRS can schedule, in days. Caps how far into the future a card can be pushed.	1 to 36,500

The defaults (90% retention, 100-year cap) match the FSRS reference defaults. Lower the retention if you’re comfortable forgetting more in exchange for fewer reviews. Raise the max interval if you want long-term cards to keep stretching out.

Review is on by default. The Review mode toggle at the top of Settings -> Learning turns it off entirely: the Review pill and the R shortcut disappear, and the FSRS settings above hide while it is off.

Tips

• Add a definition and examples in the Inspector’s Notes tab. They appear on reveal and give you something concrete to check your recall against.
• Pair concepts with at least one typed edge before reviewing them. Relations are part of what you reveal and what makes the graph worth remembering.
• The session count in the top bar reflects the original queue size. Cards rated Again that come back later increase the count past 100%. That is expected.