# ARC vs SUS4 Loop Builder

The clearest difference is update cadence: ARC at weekly against SUS4 Loop Builder's every 4 weeks. 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 3 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 every 4 weeks. The most recent releases landed on October 22, 2026 and October 25, 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** | Every 4 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 52 MB | 27 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-loop-pedal/id6777230284)

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SUS4 Loop Builder Pro Monthly | $0.99 | per month |
| SUS4 All-Access | $4.99 | per month |
| SUS4 Loop Builder Lifetime | $59.99 | one-time |


## 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 every 4 weeks. Most recently, ARC was updated on October 22, 2026 and SUS4 Loop Builder on October 25, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*