# ムーンフラグ vs Simple Mood Log

The clearest difference is in-app purchases: ムーンフラグ at none against Simple Mood Log's 2. Simple Mood Log's advantage is update cadence (every 3 days vs every 8 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Simple Mood Log sells 2 in-app purchases, starting at $0.99 per month. ムーンフラグ asks for nothing beyond the download.

ムーンフラグ ships an update every 8 months, Simple Mood Log every 3 days. The most recent releases landed on May 15, 2026 and August 10, 2026 respectively.

## The numbers

| Metric | ムーンフラグ | Simple Mood Log |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 8 months | **Every 3 days** |
| Monetization | — | Free with in-app purchases |
| Size | 114 MB | 51 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Sumie Watanabe](https://appshunter.io/developer/1349237972) | [NAOYA ONO](https://appshunter.io/developer/1530328146) |

## What reviewers say

### ムーンフラグ

[App page](https://appshunter.io/ios/app/id1619732285)

**Features:** macOS Compatibility

**In-app purchases:** none


### Simple Mood Log

[App page](https://appshunter.io/ios/app/simple-mood-log/id6449779464)

Easily track your daily mood fluctuations with this intuitive app. Record your feelings, add notes and activities, and gain insights through detailed weekly and monthly analysis graphs. It's designed for quick logging and comprehensive mood tracking.

**Highlights:** Daily mood recording, Memo and activity tagging, Add past data, Weekly/monthly analysis, Mood percentage graphs, Simple and easy to use

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Plan | $0.99 | per month |
| Support Developer | $0.99 | one-time |


## Frequently asked questions

### Is ムーンフラグ free?

ムーンフラグ is free to download, with no in-app purchases.

### Is Simple Mood Log free?

Simple Mood Log is free to download, with in-app purchases available.

### Do ムーンフラグ or Simple Mood Log have ads?

Both ムーンフラグ and Simple Mood Log show ads.

### Which is updated more often, ムーンフラグ or Simple Mood Log?

ムーンフラグ ships an update every 8 months, and Simple Mood Log every 3 days. Most recently, ムーンフラグ was updated on May 15, 2026 and Simple Mood Log on August 10, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*