# ムーンフラグ vs Simple Headache Log

The clearest difference is in-app purchases: ムーンフラグ at none against Simple Headache Log's 2. ムーンフラグ also leads on iOS requirement (12.0 vs 15.6). Simple Headache Log's advantage is update cadence (every 3 days vs every 8 months). On price, ads and device support there is nothing between them.

Both are free to download. Simple Headache Log sells 2 in-app purchases, starting at $1.49 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 Headache Log every 3 days. The most recent releases landed on May 15, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | ムーンフラグ | Simple Headache Log |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[1.5 (2 ratings)](https://appshunter.io/ios/app/simple-headache-log/id6446395359/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 0.0% 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 | 56 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| 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 Headache Log

[App page](https://appshunter.io/ios/app/simple-headache-log/id6446395359)

Easily log daily headaches by selecting pain level, weather, and potential causes. Analyze trends and identify triggers through simple charts and rankings. Record past data and manage custom pain factors.

**Highlights:** Easy pain logging with options, Analyze pain trends by weather and cause, Calendar view of daily pain levels, Add past headache data, Customizable pain causes and medicines, No login required

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Plan | $1.49 | 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 Headache Log free?

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

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

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

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

ムーンフラグ ships an update every 8 months, and Simple Headache Log every 3 days. Most recently, ムーンフラグ was updated on May 15, 2026 and Simple Headache Log on September 9, 2026.

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