# GenEi AP vs Flat Machine

The clearest difference is in-app purchases: GenEi AP at none against Flat Machine's 4. GenEi AP also leads on ads (none vs shown) and iOS requirement (11.0 vs 15.0). Flat Machine's advantage is update cadence (every 5 days vs every 2 months). On price, rating, review sentiment and ratings volume there is nothing between them.

Both are free to download. Flat Machine sells 4 one-off in-app purchases. GenEi AP asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for GenEi AP against 4.9 for Flat Machine. Both are backed by a comparable volume of ratings — 131 and 68 respectively. Written reviews split almost evenly too, at 93% and 94% positive.

GenEi AP ships an update every 2 months, Flat Machine every 5 days. The most recent releases landed on October 13, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | GenEi AP | Flat Machine |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (131 ratings)](https://appshunter.io/ios/app/genei-ap-empty-heart/id1613648240/reviews)** | [4.9 (68 ratings)](https://appshunter.io/ios/app/flat-machine-post-apocalyptic/id6473309112/reviews) |
| Number of ratings | **131** | 68 |
| Positive reviews | 92.9% of reviews | **93.7% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Every 5 days** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 280 MB | 118 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [room6 LLC.](https://appshunter.io/developer/581220756) | [zxima.LLC](https://appshunter.io/developer/714594983) |

## What reviewers say

### GenEi AP

[App page](https://appshunter.io/ios/app/genei-ap-empty-heart/id1613648240)

Embark on a musical quest through a mysterious world inspired by Harumakigohan's art and music. Help the protagonist find songs to please a friend, uncovering secrets behind doors and mysterious heartbeats.

**Highlights:** Explore Harumakigohan's artistic world, Quest for music and songs, Uncover mysteries and secrets, Inspired by Vocaloid music, Part of a cross-media trilogy

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

**In-app purchases:** none

**What reviewers like**

- 💖 Beautiful pixel art
- 🎶 Amazing music
- 📖 Engaging story
- 😌 Relaxing atmosphere
- ✨ Emotional impact

**What reviewers complain about**

- ⏳ Story is too short
- 🤔 Puzzles can be difficult
- 🗺️ Map can be confusing
- 🤷‍♀️ Some don't understand the story
- 🎶 Music not to everyone's taste

**Requested features**

- Add a reset button
- Make more games like this
- Add a rhythm game function
- Create a sequel or update


### 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 GenEi AP free?

GenEi AP is free to download, with no in-app purchases.

### Is Flat Machine free?

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

### Which has better reviews, GenEi AP or Flat Machine?

GenEi AP is rated higher. GenEi AP averages 5.0 out of 5 from 131 ratings, while Flat Machine averages 4.9 from 68 ratings.

### Do GenEi AP or Flat Machine have ads?

Flat Machine shows ads; GenEi AP does not.

### Which is updated more often, GenEi AP or Flat Machine?

GenEi AP ships an update every 2 months, and Flat Machine every 5 days. Most recently, GenEi AP was updated on October 13, 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.*