PRIORITIES
Major features ordered by priority. High priority items are actively being worked on. This list focuses on significant additions, not every bug fix or minor improvement.
A smarter spaced repetition algorithm that understands what your cards mean, not just when you last saw them. Reviews are scheduled based on semantic similarity and attention patterns.
You can't remember everything you've ever written down. But you can remember the right things at the right time. S4 looks at dates in your notes and optimizes the scheduler to maximize retention of that context by the time it matters.
Build review decks visually. Select cards from the knowledge graph or let semantic search find related content across your notes.
A spatial canvas for connecting ideas visually. Nodes can be notes, cards, or AI-generated insights. Think of it as a whiteboard that understands your knowledge graph.
Sketch diagrams and annotations directly in your notes. Full stylus support with pressure sensitivity.
A focused reading mode for rapid content consumption. Control the pace and track your reading progress across documents.
Time-indexed notes and reviews. See what you were working on any given day and schedule future study sessions.
Query your notes like a database. Filter by metadata, dates, links, and semantic similarity.
Extend S4 with community-built widgets. Custom review modes, visualizations, and integrations.
Start with what's already built. No account required.
Download S4S4 is an independent product and is not affiliated with or endorsed by Obsidian.