---
title: "まるばつカレンダー：予定表とマーク日記 — App Overview"
url: https://marlvel.ai/apps/saeki-calendar
category: Productivity
developer: Masao Saeki
platforms: ios
rating: N/A (0 ratings)
pricing: free
report_level: overview
generated: 2026-05-08
last_verified: "2026-05-08T16:26:43.788Z"
---

<!-- SECTION: Key Insight -->
> **Key Insight:** The app focuses on self-awareness by providing a low-friction method to correlate daily events with personal happiness levels.

<!-- SECTION: Quick Facts -->
| Metric | Value |
|--------|-------|
| Category | Productivity |
| Rating | N/A ★ (0) |
| Pricing | free |
| Platforms | iOS |
| Latest Version (iOS) | 1.7.3 |
| Developer | Masao Saeki |

<!-- SECTION: Summary -->
## What is まるばつカレンダー：予定表とマーク日記?

Marubatsu Calendar is a productivity and journaling app that combines schedule management with a simplified daily reflection tool. It utilizes a 'world's simplest diary' method, allowing users to categorize their days as 'maru' (good), 'batsu' (bad), or 'sankaku' (average) to track personal happiness and value shifts over time.

<!-- SECTION: Key Features -->
## Key Features

- **Schedule Management**: Integrated calendar functionality for tracking daily appointments and tasks.
- **Three-Tier Daily Rating**: A simplified journaling system where users evaluate their day using 'maru', 'batsu', or 'sankaku' markers.
- **Value Trend Analysis**: Helps users identify how their personal criteria for a 'good' or 'bad' day evolve over time.

<!-- SECTION: Target Audience -->
## Who is it for?

Individuals seeking to measure their personal happiness, understand their own values, or maintain a low-effort daily reflection habit.

<!-- SECTION: Links -->
## Links

- [App Store](https://apps.apple.com/us/app/%E3%81%BE%E3%82%8B%E3%81%B0%E3%81%A4%E3%82%AB%E3%83%AC%E3%83%B3%E3%83%80%E3%83%BC-%E4%BA%88%E5%AE%9A%E8%A1%A8%E3%81%A8%E3%83%9E%E3%83%BC%E3%82%AF%E6%97%A5%E8%A8%98/id6448878378?uo=4)
- [Full Intelligence Report](https://marlvel.ai/apps/saeki-calendar)

---
*This is an overview report. Sentiment analysis, competitive landscape, and SWOT analysis are available in the [full intelligence report](https://marlvel.ai/apps/saeki-calendar).*
*Generated by [Marlvel.ai](https://marlvel.ai) — Independent app intelligence.*