# Flat vs Concentric Rhythm

The clearest difference is price: Flat at Free against Concentric Rhythm's $3.99. Flat also leads on ratings volume (7K vs 43) and chart position (#137 vs unranked). Concentric Rhythm's advantage is review sentiment (80% vs 68%) and iOS requirement (10.0 vs 16.4). On rating, update cadence, ads and in-app purchases there is nothing between them.

Flat is free to download; Concentric Rhythm costs $3.99 up front. Flat sells 10 in-app purchases, starting at $9.99 per month and Concentric Rhythm sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.6 for Flat against 4.7 for Concentric Rhythm. That said, the two scores are not equally well evidenced: Flat has 7K ratings behind it against 43, so its average is the more settled of the two. Written reviews are what separate them: 68% of Flat's written reviews are positive against 80% of Concentric Rhythm's.

Flat ships an update fortnightly, Concentric Rhythm every 2 weeks. The most recent releases landed on November 9, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | Flat | Concentric Rhythm |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | [4.6 (7K ratings)](https://appshunter.io/ios/app/flat-sheet-music-maker-and-tabs/id1177592149/reviews) | **[4.7 (43 ratings)](https://appshunter.io/ios/app/concentric-rhythm/id1188907944/reviews)** |
| Number of ratings | **7K** | 43 |
| Positive reviews | 67.8% of reviews | **80.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 2 weeks |
| Monetization | Freemium | Free with in-app purchases |
| Best chart rank | **#137** | — |
| Size | 219 MB | 44 MB |
| Requires iOS | 16.4 | **10.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | +4 | 4+ |
| Developer | [Tutteo Limited](https://appshunter.io/developer/1177592148) | [Jeff Holtzkener](https://appshunter.io/developer/1087693055) |

## What reviewers say

### Flat

[App page](https://appshunter.io/ios/app/flat-sheet-music-maker-and-tabs/id1177592149)

**Currently charting:** #137 Top Grossing · Music, #151 Top Free · Music (US App Store)

Create, edit, and play sheet music and guitar tabs with this intuitive composer app. It offers a wide range of instruments, notation tools, and collaboration features. Import and export in various formats, and share your creations with a large community.

**Highlights:** Compose and edit sheet music, Create guitar tabs, Real-time collaboration, Import MusicXML, MIDI, PDF, Export to PDF, MIDI, MP3, WAV, Large community library, 90+ instruments

**Features:** Vision Pro support, iPhone Duo support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Flat Power (Monthly) | $9.99 | per month |
| Flat Power (Yearly) | $29.99 | per year |
| Flat Power (Yearly) | $39.99 | per year |
| Flat Power (Yearly) | $49.99 | per year |
| PDF import 30 credits | $9.99 | one-time |
| PDF import 70 credits | $17.99 | one-time |
| Flat Power (Lifetime) | $119.00 | one-time |
| Flat Power (Lifetime) | $179.99 | one-time |
| Flat Power (Lifetime) | $199.00 | one-time |
| Flat Power (Lifetime) | $299.99 | one-time |

**What reviewers like**

- 🚀 Easy to use
- 👍 Great for beginners
- 🎨 Lots of customization options
- 🎶 Extensive instrument selection
- 💡 Collaborative features

**What reviewers complain about**

- 🐛 Buggy and glitchy
- 🔒 Limited free features
- 💰 Expensive subscription
- 🔊 Poor audio quality
- 📏 Rigid layout and formatting

**Reported bugs**

- App crashes frequently
- Notes and rests disappear
- Playback issues and audio glitches
- Difficulty selecting and editing notes
- Syncing and saving problems

**Requested features**

- Add more percussion instruments
- Improve note entry and editing
- Allow custom soundfonts
- Implement measure repeat signs
- Add more advanced notation options


### Concentric Rhythm

[App page](https://appshunter.io/ios/app/concentric-rhythm/id1188907944)

Generate, develop, and explore musical patterns using geometric transformations and simple processes. Visualize musical timelines as circles for intuitive manipulation and create complex rhythms and melodies. Connect to other MIDI-compatible apps and devices.

**Highlights:** Geometric pattern generation, Circular musical timeline visualization, Melodic line tools (random-walk, scale-based), Rhythmic line generation (cross-rhythms, Euclidean algorithm), MIDI output to other apps/devices, Visualizations of polyrhythms

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| MIDI Send | $4.99 | one-time |


## Frequently asked questions

### Is Flat free?

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

### Is Concentric Rhythm free?

Concentric Rhythm costs $3.99, and also offers in-app purchases.

### Which has better reviews, Flat or Concentric Rhythm?

Concentric Rhythm is rated higher. Flat averages 4.6 out of 5 from 7K ratings, while Concentric Rhythm averages 4.7 from 43 ratings.

### Do Flat or Concentric Rhythm have ads?

Neither Flat nor Concentric Rhythm shows ads.

### Which is updated more often, Flat or Concentric Rhythm?

Flat ships an update fortnightly, and Concentric Rhythm every 2 weeks. Most recently, Flat was updated on November 9, 2026 and Concentric Rhythm on November 2, 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.*