# C.ARP vs Operabook

The clearest difference is price: Operabook at Free against C.ARP's $9.99. C.ARP's advantage is update cadence (monthly vs every 5 months) and chart position (#93 vs unranked). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Operabook is free to download; C.ARP costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

C.ARP ships an update monthly, Operabook every 5 months. The most recent releases landed on October 12, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | C.ARP | Operabook |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | **[4.3 (114 ratings)](https://appshunter.io/ios/app/carp/id1481916004/reviews)** | — |
| Number of ratings | **114** | — |
| Positive reviews | 74.6% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 5 months |
| Monetization | Free | — |
| Best chart rank | **#93** | — |
| Size | 46 MB | 29 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Paolo Giorgi](https://appshunter.io/developer/1481916003) | [IT4Culture](https://appshunter.io/developer/1403774308) |

## What reviewers say

### C.ARP

[App page](https://appshunter.io/ios/app/carp/id1481916004)

**Currently charting:** #93 Top Paid · Music (US App Store)

This app offers a unique approach to music creation, inspired by vintage instruments. It allows users to play chords and melodies with intuitive touch controls, apply real-time audio effects, and utilize a dynamic rhythm section. Advanced features include sampling, MIDI output via Bluetooth, and an iPad-optimized interface.

**Highlights:** Chord and melody playing, Real-time audio effects, Dynamic rhythm section, Sampling and looping, MIDI output via Bluetooth, iPad optimized interface, In-app tutorial

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

**In-app purchases:** none

**What reviewers like**

- 🎶 Authentic omnichord sound
- 💡 Great for learning music theory
- 🤩 Fun and enjoyable to use
- 📱 Accessible on mobile devices
- 💰 Affordable alternative to real omnichord

**What reviewers complain about**

- 🔊 No sound issue
- 💥 Frequent crashes
- 🤔 Confusing interface/menus
- 🐌 Slow UI responsiveness
- 🎚️ Limited sound design options

**Reported bugs**

- Sound doesn't work
- No sound
- App crashes when opening
- App crashes when trying to open
- App auto-quits on start

**Requested features**

- Rearrange layout to be chromatic
- AUV3 support
- Inter-app-audio / GarageBand integration
- MIDI out functionality
- Save last state


### Operabook

[App page](https://appshunter.io/ios/app/operabook/id6747315134)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is C.ARP free?

C.ARP costs $9.99, with no in-app purchases.

### Is Operabook free?

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

### Do C.ARP or Operabook have ads?

Neither C.ARP nor Operabook shows ads.

### Which is updated more often, C.ARP or Operabook?

C.ARP ships an update monthly, and Operabook every 5 months. Most recently, C.ARP was updated on October 12, 2026 and Operabook on October 6, 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.*