# C.ARP vs Otoo

The clearest difference is rating: Otoo at 5.0 against C.ARP's 4.3. Otoo also leads on review sentiment (100% vs 74%) and update cadence (every 6 days vs every 4 weeks). C.ARP's advantage is ratings volume (114 vs 28) and iOS requirement (13.0 vs 15.6). On ads, in-app purchases and device support there is nothing between them.

C.ARP costs $9.99 and Otoo $6.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Otoo holds the better App Store score, 5.0 against 4.3. Both are backed by a comparable volume of ratings — 114 and 28 respectively. Written reviews point the same way: 74% of C.ARP's written reviews are positive against 100% of Otoo's.

C.ARP ships an update every 4 weeks, Otoo every 6 days. The most recent releases landed on September 22, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | C.ARP | Otoo |
| --- | --- | --- |
| Price | $9.99 | **$6.99** |
| Rating | [4.3 (114 ratings)](https://appshunter.io/ios/app/carp/id1481916004/reviews) | **[5.0 (28 ratings)](https://appshunter.io/ios/app/otoo/id6759285903/reviews)** |
| Number of ratings | **114** | 28 |
| Positive reviews | 74.3% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 weeks | **Every 6 days** |
| Monetization | **Free** | Paid |
| Best chart rank | — | **#119** |
| Size | 45 MB | 64 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Paolo Giorgi](https://appshunter.io/developer/1481916003) | [BeepStreet](https://appshunter.io/developer/321412321) |

## What reviewers say

### C.ARP

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

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


### Otoo

[App page](https://appshunter.io/ios/app/otoo/id6759285903)

**Currently charting:** #119 Top Paid · Music (US App Store)

This music creation app offers a unique free-form sequencer for building beats and melodies. It supports built-in sounds, sampling, and AUv3 instruments, with live performance effects and song arrangement tools.

**Highlights:** Free-form step sequencer, Single-screen workflow, Built-in sounds and sampler, AUv3 instrument support, Performance Mode effects, Export WAV, MP3, and MIDI

**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 Otoo free?

Otoo costs $6.99, with no in-app purchases.

### Which has better reviews, C.ARP or Otoo?

Otoo is rated higher. C.ARP averages 4.3 out of 5 from 114 ratings, while Otoo averages 5.0 from 28 ratings.

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

Neither C.ARP nor Otoo shows ads.

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

C.ARP ships an update every 4 weeks, and Otoo every 6 days. Most recently, C.ARP was updated on September 22, 2026 and Otoo on September 21, 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.*