# ARC vs SUS4 Loop Builder

The clearest difference is update cadence: ARC at weekly against SUS4 Loop Builder's monthly. SUS4 Loop Builder's advantage is iOS requirement (16.0 vs 18.1). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. ARC sells 2 one-off in-app purchases and SUS4 Loop Builder sells 2 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

ARC ships an update weekly, SUS4 Loop Builder monthly. The most recent releases landed on October 5, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | ARC | SUS4 Loop Builder |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (3 ratings)](https://appshunter.io/ios/app/arc-24-multitrack-groovebox/id6773901604/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Monthly |
| Monetization | Free with in-app purchases | — |
| Size | 52 MB | 20 MB |
| Requires iOS | 18.1 | **16.0** |
| Devices | iPhone, iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Daelan Wood](https://appshunter.io/developer/1781308426) | [ThePaulSmith](https://appshunter.io/developer/319584506) |

## What reviewers say

### ARC

[App page](https://appshunter.io/ios/app/arc-24-multitrack-groovebox/id6773901604)

Create music with a versatile groovebox featuring eight tracks for synths, samplers, and drums. Its intuitive interface allows for real-time performance and easy arrangement into songs, all while staying in key and scale.

**Highlights:** Eight dynamic tracks (synth, sampler, drums), Key and scale locked note/chord pads, 16-pad sampler with import/record, Deep synth editing and 25 arpeggiator patterns, Full mixer with EQ and individual track effects, Song mode for arrangement and live performance, MIDI input and iCloud sync

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 7-Day Trial | Free | one-time |
| ARC-24 Full Version | $9.99 | one-time |


### SUS4 Loop Builder

[App page](https://appshunter.io/ios/app/sus4-loop-builder-looper/id6777230284)

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SUS4 Loop Builder Pro Monthly | $0.99 | per month |
| SUS4 All-Access | $4.99 | per month |


## Frequently asked questions

### Is ARC free?

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

### Is SUS4 Loop Builder free?

SUS4 Loop Builder is free to download, with in-app purchases available.

### Do ARC or SUS4 Loop Builder have ads?

Neither ARC nor SUS4 Loop Builder shows ads.

### Which is updated more often, ARC or SUS4 Loop Builder?

ARC ships an update weekly, and SUS4 Loop Builder monthly. Most recently, ARC was updated on October 5, 2026 and SUS4 Loop Builder on October 12, 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.*