Spaced Repetition Schedule

This application is an advanced study schedule manager built on the **Forgetting Curve** proposed by the German psychologist **Hermann Ebbinghaus**. Rather than merely recording dates, it **automatically calculates and embeds optimal review timings** so that what you learn sticks, maximizing your study efficiency.

All data is stored **locally in your browser** (IndexedDB). No server-side sign-up is required, and the app works **offline**.

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## Key Features

### 1) Automatic review plans based on the forgetting curve

When you register a new study item, the app generates a science-based review schedule. Choose the mode that fits your situation:

* **Standard Mode:** Reviews are set **1 day**, **7 days**, and **30 days** after the initial study—ideal for long-term retention.

* **Intensive Mode:** Reviews are set on the **same day**, then **1 day**, **3 days**, and **7 days** later—perfect for short, exam-focused sprints.

### 2) Calendar visualization

The main screen is a clean, color-coded calendar. Your original **study tasks** and the auto-generated **review tasks** appear as subject-colored badges, giving you a one-glance view of the month. Completed items change appearance, making progress tracking effortless.

### 3) Flexible task entry (single or bulk)

* **Single entry:** Specify subject, material, study range (e.g., pages), and date to add one task quickly.

* **Bulk entry:** Ideal for working through a full textbook or problem set. Set the start page, end page, pages per day, and study cadence (e.g., every two days). The app automatically creates the entire sequence of study tasks **and all corresponding review tasks**. You can also exclude specific days or dates from scheduling.

### 4) Detailed task management

Click a date to open a focused task list for that day:

* **Completion check:** Mark items done with a single tick.

* **Date changes:** If plans slip, reschedule any pending study task; **all future review dates linked to it are recalculated automatically**, preventing schedule collapse.

* **Deletion:** Remove an unneeded study plan and **all its linked review tasks** in one action.

### 5) Advanced customization and data control

* **Multiple user profiles:** Create and switch profiles. Share within a family or separate schedules by purpose (e.g., “Certification” vs. “Language”).

* **Subject customization:** Rename default subjects and rearrange them via drag-and-drop.

* **Multilingual UI:** Switch between **Japanese** and **English**.

* **Data protection:** Export **all schedules and settings** as a single file for backup or migration to another device—simple and safe.

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This app is more than a planner; it is a **strategic partner** for learning. By automating the burdensome work of planning reviews, it lets you focus on what truly matters: **studying**. From students to professionals, it’s a practical tool for anyone who wants to learn efficiently and retain knowledge for the long term.