Planner 2026
My kids forget what they studied yesterday. So I built a calendar that remembers for them — on Day 1, 4, 7, and 14.
Ebbinghaus forgetting curve-based review calendar that auto-generates D+1, D+4, D+7, D+14 spaced repetition schedules from study logs.
The Backstory
My kids would study hard one day, then completely forget it by the weekend. I’d ask “didn’t you just learn that?” and get a blank stare. The problem wasn’t effort — it was timing. The Ebbinghaus forgetting curve shows we lose 80% of new information within a week without review. The fix is simple: review at Day 1, 4, 7, and 14.
But no app made this automatic. You’d have to manually schedule each review. So I built a calendar where you just log what you studied, and it auto-generates all four review checkpoints.
Key Features
- Auto-scheduling — Record a study session and 4 review tasks appear on D+1, D+4, D+7, D+14
- 4-color calendar — Green (studied), Blue (reviews done), Orange (reviews pending), Red (overdue)
- 3-level retention check — Rate each review with emoji feedback (great/okay/forgot)
- Built-in stopwatch — Track focus time with start/stop timer
- 4-color importance — Highlight-pen style priority markers (green, yellow, orange, pink)
- GitHub-style heatmap — Annual activity visualization
- Dashboard analytics — Weekly completion rate, subject distribution, study streaks
Technical Architecture
React 19 with Zustand 5 for state management. Study entries and review tasks use a 1:4 relationship model — each study log generates exactly 4 review tasks linked by entryId. Recharts powers the dashboard charts. All data persists in localStorage with a clean partialize strategy that excludes transient timer state.
Why I Built This
Spaced repetition works. The science is clear. But my kids needed something dead simple — log what you studied, and the calendar handles the rest. No complex settings, no manual scheduling. Just study and review.
Screenshots
