# Utsuro’s diary vs Flat Machine

The clearest difference is update cadence: Flat Machine at every 5 days against Utsuro’s diary's every 5 weeks. Flat Machine also leads on review sentiment (94% vs 77%) and rating (4.9 vs 4.7). Utsuro’s diary's advantage is ratings volume (440 vs 68) and iOS requirement (9.0 vs 15.0). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Utsuro’s diary sells 5 one-off in-app purchases and Flat Machine sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Flat Machine holds the better App Store score, 4.9 against 4.7. That said, the two scores are not equally well evidenced: Utsuro’s diary has 440 ratings behind it against 68, so its average is the more settled of the two. Written reviews point the same way: 77% of Utsuro’s diary's written reviews are positive against 94% of Flat Machine's.

Utsuro’s diary ships an update every 5 weeks, Flat Machine every 5 days. The most recent releases landed on October 14, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Utsuro’s diary | Flat Machine |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (440 ratings)](https://appshunter.io/ios/app/utsuros-diary/id1459925714/reviews) | **[4.9 (68 ratings)](https://appshunter.io/ios/app/flat-machine-post-apocalyptic/id6473309112/reviews)** |
| Number of ratings | **440** | 68 |
| Positive reviews | 76.8% of reviews | **93.7% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 5 weeks | **Every 5 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 266 MB | 118 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 9+ | 12+ |
| Developer | [YANASE GAMES, INC.](https://appshunter.io/developer/1426325846) | [zxima.LLC](https://appshunter.io/developer/714594983) |

## What reviewers say

### Utsuro’s diary

[App page](https://appshunter.io/ios/app/utsuros-diary/id1459925714)

Engage in a chilling diary exchange with an obsessive girlfriend. What begins as a popular trend quickly escalates into a terrifying nightmare for the main character.

**Highlights:** Diary exchange gameplay, Obsessive girlfriend narrative, Socialable high school student protagonist, Nightmare escalation, Interactive story

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Akari, Utsuro happy ending | $4.99 | one-time |
| Natsuna and Utsuro route | $7.99 | one-time |
| Kokoro and Utsuro route | $7.99 | one-time |
| Utsuro date | $11.99 | one-time |
| All Edition All Stories | $15.99 | one-time |

**What reviewers like**

- 🎨 Beautiful art style and character designs
- 🎤 Great voice acting quality
- 📖 Engaging story with plot twists
- 😱 Effective psychological horror elements
- 💰 Affordable pricing

**What reviewers complain about**

- 🐛 Frequent app crashes
- 📝 Poor English translation and grammar
- 🎭 Unclear dialogue attribution (talking vs thinking)
- 💸 High pricing for additional story endings
- 📱 Compatibility issues with older devices

**Reported bugs**

- App crashes when starting new story or day
- Game crashes on iPhone 6 with iOS 12.5.1
- Blank message on day three blocks progression
- App closes itself after recent updates
- Save data lost upon game reinstallation

**Requested features**

- Auto-read/text-to-speech functionality
- Player character gender customization
- Improved dialogue clarity indicators
- Better save data persistence across reinstalls
- Reduced ad frequency


### Flat Machine

[App page](https://appshunter.io/ios/app/flat-machine-post-apocalyptic/id6473309112)

Control a limbless robot tasked with defending a settlement in a post-apocalyptic world. Engage in simple, timing-based battles against various threats and make choices that influence the game's multiple endings. Discover the mystery of your own identity.

**Highlights:** Simple, timing-based battles, Item combination system, Respond to various visitors, Multiple endings based on choices, Daily events and encounters

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| AD removal | $2.99 | one-time |
| Donation(S) | $3.99 | one-time |
| Donation(M) | $14.99 | one-time |
| Donation(L) | $34.99 | one-time |

**What reviewers like**

- 👍 Highly engaging gameplay
- 💖 Compelling characters and story
- 💡 Multiple endings and replayability
- ✨ Unique post-apocalyptic world
- 🎮 Satisfying progression and strategy

**What reviewers complain about**

- 🐛 Ad issues (app store redirection)
- 🐛 Ads sometimes break BGM
- ⚖️ Endless mode can feel like pure luck
- ❓ Some events seem to have limited interactions
- 🚫 Lack of Chinese translation

**Reported bugs**

- Ads redirect to app store and prevent item rewards
- Ad BGM continues playing after ad ends
- Ad BGM persists even after restarting app
- Agoda ads prevent continuing the game

**Requested features**

- Add Chinese translation
- Add Vietnamese translation
- Add Spanish translation
- Option for one-time purchase to remove ads
- More interactions with certain characters (e.g., training robot)


## Frequently asked questions

### Is Utsuro’s diary free?

Utsuro’s diary is free to download, with in-app purchases available.

### Is Flat Machine free?

Flat Machine is free to download, with in-app purchases available.

### Which has better reviews, Utsuro’s diary or Flat Machine?

Flat Machine is rated higher. Utsuro’s diary averages 4.7 out of 5 from 440 ratings, while Flat Machine averages 4.9 from 68 ratings.

### Do Utsuro’s diary or Flat Machine have ads?

Both Utsuro’s diary and Flat Machine show ads.

### Which is updated more often, Utsuro’s diary or Flat Machine?

Utsuro’s diary ships an update every 5 weeks, and Flat Machine every 5 days. Most recently, Utsuro’s diary was updated on October 14, 2026 and Flat Machine on October 15, 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.*