The bridge between knowledge and success

Review flashcards with spaced repetition that adapts to what you actually struggle with. Everything stays organized in one place.

Why Tsunagi

FSRS schedules every card from your actual memory, not a fixed formula. You spend time on what you're forgetting, not what you already know.

Freeze a card for a day or bury it until you're ready. Missing a session doesn't wreck your progress.

No account, no cloud required. Everything you study stays on your device, protected by your phone's own security — never uploaded anywhere.

Spaced repetition that adapts to what you actually struggle with.

Blank out exactly what you want to test — each blank becomes its own card automatically.

Quick recall checks for facts and definitions — no typing required.

Test recognition alongside recall, with distractors you write yourself.

Hide labels on diagrams and figures with editable shapes, not flattened images.

LaTeX equations, Mermaid diagrams, and code blocks render right on the card.

Attach images, video, audio, 3D models, and molecule structures directly to a card — built in, no add-ons required.

Music notation, chemical diagrams, DNA sequences, and phylogenetic trees render natively as you type — all offline.

Currently in closed testing — request access to try it early.