# Quantiloop vs SUS4 Loop Builder

The clearest difference is update cadence: SUS4 Loop Builder at every 4 weeks against Quantiloop's every 3 months. Quantiloop's advantage is iOS requirement (12.0 vs 16.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Quantiloop 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.

Quantiloop ships an update every 3 months, SUS4 Loop Builder every 4 weeks. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Quantiloop | SUS4 Loop Builder |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (38 ratings)](https://appshunter.io/ios/app/quantiloop-live-looper/id1268082518/reviews)** | — |
| Number of ratings | **38** | — |
| Positive reviews | 56.5% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 4 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 16 MB | 27 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Stephan Marx](https://appshunter.io/developer/1156213358) | [ThePaulSmith](https://appshunter.io/developer/319584506) |

## What reviewers say

### Quantiloop

[App page](https://appshunter.io/ios/app/quantiloop-live-looper/id1268082518)

This app offers a powerful 4-track live looping experience for musicians, replicating hardware loop pedals on iOS. It supports hands-free operation with MIDI controllers or automated recording, allowing for complex musical arrangements and creative effects.

**Highlights:** 4-track live looping, Hands-free MIDI control, Unlimited overdubs, Built-in rhythm guide, Assignable FX, Ableton Link synchronization

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro (7 Day Trial) | Free | one-time |
| Pro Upgrade | $14.99 | one-time |

**What reviewers like**

- 👍 Great looper functionality
- 💡 Versatile and powerful
- 💰 Cost-effective alternative
- 🚀 Works well with other apps
- 🎼 Good for practice and recording

**What reviewers complain about**

- 📢 Annoying voice message
- 👎 Unusable free version
- 🤔 Difficult to learn
- 🐛 Occasional glitches/stutters
- 📱 UI issues on smaller screens

**Reported bugs**

- Voice message interrupts loops
- App closes on launch (iPad mini 2)
- Random tempo fluctuations
- Buttons not appearing on iPhone mini 13
- Pro status lost after app offload

**Requested features**

- Add slicer effect
- Save old phrase + FX settings
- Add record button to audio file
- Support split screen on iPad Pro
- Provide instruction manual in Russian


### 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 Quantiloop free?

Quantiloop 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 Quantiloop or SUS4 Loop Builder have ads?

Neither Quantiloop nor SUS4 Loop Builder shows ads.

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

Quantiloop ships an update every 3 months, and SUS4 Loop Builder every 4 weeks. Most recently, Quantiloop was updated on October 24, 2026 and SUS4 Loop Builder on October 25, 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.*