# 2XB303 Acid Bass Loop Maker vs SUS4 Loop Builder

The clearest difference is price: SUS4 Loop Builder at Free against 2XB303 Acid Bass Loop Maker's $3.99. 2XB303 Acid Bass Loop Maker's advantage is in-app purchases (none vs 2) and update cadence (every 10 days vs monthly). On ads, device support and iOS requirement there is nothing between them.

SUS4 Loop Builder is free to download; 2XB303 Acid Bass Loop Maker costs $3.99 up front. SUS4 Loop Builder sells 2 in-app purchases, starting at $0.99 per month. 2XB303 Acid Bass Loop Maker asks for nothing beyond the download.

2XB303 Acid Bass Loop Maker ships an update every 10 days, SUS4 Loop Builder monthly. The most recent releases landed on October 19, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | 2XB303 Acid Bass Loop Maker | SUS4 Loop Builder |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | **[4.7 (57 ratings)](https://appshunter.io/ios/app/2xb303-acid-bass-loop-maker/id1288067698/reviews)** | — |
| Number of ratings | **57** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 10 days** | Monthly |
| Monetization | Paid | — |
| Size | 16 MB | 20 MB |
| Requires iOS | **15.6** | 16.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Rob Wilmot](https://appshunter.io/developer/520672432) | [ThePaulSmith](https://appshunter.io/developer/319584506) |

## What reviewers say

### 2XB303 Acid Bass Loop Maker

[App page](https://appshunter.io/ios/app/2xb303-acid-bass-loop-maker/id1288067698)

Create electro melodies and acid techno basslines with this creative bass synth sequencer. Features live control for triggering sequences and synth pads, random generation, and extensive sound shaping options. Export your audio loops easily.

**Highlights:** Bass synth sequencer, Live control for sequences and pads, Audio loop recording and export, Random sequence generation, Tweakable synth parameters, MIDI and Ableton Link syncing, Global effects: Overdrive, Compression, Echo

**Features:** Vision Pro support

**In-app purchases:** none


### 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 2XB303 Acid Bass Loop Maker free?

2XB303 Acid Bass Loop Maker costs $3.99, with no in-app purchases.

### Is SUS4 Loop Builder free?

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

### Do 2XB303 Acid Bass Loop Maker or SUS4 Loop Builder have ads?

Neither 2XB303 Acid Bass Loop Maker nor SUS4 Loop Builder shows ads.

### Which is updated more often, 2XB303 Acid Bass Loop Maker or SUS4 Loop Builder?

2XB303 Acid Bass Loop Maker ships an update every 10 days, and SUS4 Loop Builder monthly. Most recently, 2XB303 Acid Bass Loop Maker was updated on October 19, 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.*