# Willysm（ウィリズム） vs Gut diary

The clearest difference is update cadence: Gut diary at every 3 weeks against Willysm（ウィリズム）'s every 2 months. Gut diary also leads on iOS requirement (10.0 vs 13.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Willysm（ウィリズム） ships an update every 2 months, Gut diary every 3 weeks. The most recent releases landed on May 17, 2026 and July 28, 2026 respectively.

## The numbers

| Metric | Willysm（ウィリズム） | Gut diary |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.5 (2 ratings)](https://appshunter.io/ios/app/gut-diary/id1455072067/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 16.7% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | — | Free |
| Size | 13 MB | 53 MB |
| Requires iOS | 13.0 | **10.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPod, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [SIOS Technology Inc.](https://appshunter.io/developer/1465052137) | [Keietsu Yasuhara](https://appshunter.io/developer/378538320) |

## What reviewers say

### Willysm（ウィリズム）

[App page](https://appshunter.io/ios/app/willysm/id1259705187)

**Features:** macOS Compatibility

**In-app purchases:** none


### Gut diary

[App page](https://appshunter.io/ios/app/gut-diary/id1455072067)

Track your daily physical, psychological, and social activities to understand their impact on your gut health. Record bowel habits, diet, sleep, exercise, and even moments of happiness. Sync with health data to identify patterns and contributing factors to abdominal comfort.

**Highlights:** Bowel habit tracking, Diet logging, Sleep cycle monitoring, Exercise recording, Social activity logging, Heart rate synchronization, Abdominal pain and stool shape entry

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Willysm（ウィリズム） free?

Willysm（ウィリズム） is free to download, with no in-app purchases.

### Is Gut diary free?

Gut diary is free to download, with no in-app purchases.

### Do Willysm（ウィリズム） or Gut diary have ads?

Neither Willysm（ウィリズム） nor Gut diary shows ads.

### Which is updated more often, Willysm（ウィリズム） or Gut diary?

Willysm（ウィリズム） ships an update every 2 months, and Gut diary every 3 weeks. Most recently, Willysm（ウィリズム） was updated on May 17, 2026 and Gut diary on July 28, 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.*