# Audio Unit Player vs Billie Tracker

The clearest difference is rating: Billie Tracker at 5.0 against Audio Unit Player's 3.9. Billie Tracker also leads on in-app purchases (none vs 1) and ads (none vs shown). Audio Unit Player's advantage is ratings volume (30 vs 5). On price and device support there is nothing between them.

Both are free to download. Audio Unit Player sells 1 one-off in-app purchase. Billie Tracker asks for nothing beyond the download.

Billie Tracker holds the better App Store score, 5.0 against 3.9. That said, the two scores are not equally well evidenced: Audio Unit Player has 30 ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 67% of Audio Unit Player's written reviews are positive against 100% of Billie Tracker's.

Audio Unit Player ships an update every 2 weeks, Billie Tracker every 2 days. The most recent releases landed on October 9, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Audio Unit Player | Billie Tracker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.9 (30 ratings)](https://appshunter.io/ios/app/audio-unit-player/id734191615/reviews) | **[5.0 (5 ratings)](https://appshunter.io/ios/app/billie-tracker/id6792379355/reviews)** |
| Number of ratings | **30** | 5 |
| Positive reviews | 66.7% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 2 weeks | **Every 2 days** |
| Monetization | Paid | **Free** |
| Size | 5 MB | 56 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Loop-Sessions.LLC.](https://appshunter.io/developer/414215366) | [Billie Cooperative](https://appshunter.io/developer/1832623915) |

## What reviewers say

### Audio Unit Player

[App page](https://appshunter.io/ios/app/audio-unit-player/id734191615)

This music player offers real-time audio processing, including time stretching, pitch shifting, and a 31-band equalizer. It supports AUv3 effects and allows for A-B loop playback, making it ideal for practice, transcription, and performance adjustments.

**Highlights:** Real-time time stretch (50-200%), Real-time pitch shift (-12 to +12 semitones), 31-band equalizer with presets, AUv3 effects support, A-B loop playback, Background playback, Audio file export

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Always remove banner ads. | $3.99 | one-time |


### Billie Tracker

[App page](https://appshunter.io/ios/app/billie-tracker/id6792379355)

Create music with a powerful groovebox featuring a step sequencer, synthesizers, and a sampler. Arrange patterns into songs, shape unique sounds, and export your finished tracks. Designed for intuitive music production on mobile devices.

**Highlights:** Step sequencer for notes and instruments, Shapeable synth instruments, In-app sampler for recording sounds, Mixer with per-track controls, Song arrangement and export options, Hardware controller support

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

**In-app purchases:** none


## Frequently asked questions

### Is Audio Unit Player free?

Audio Unit Player is free to download, with in-app purchases available.

### Is Billie Tracker free?

Billie Tracker is free to download, with no in-app purchases.

### Which has better reviews, Audio Unit Player or Billie Tracker?

Billie Tracker is rated higher. Audio Unit Player averages 3.9 out of 5 from 30 ratings, while Billie Tracker averages 5.0 from 5 ratings.

### Do Audio Unit Player or Billie Tracker have ads?

Audio Unit Player shows ads; Billie Tracker does not.

### Which is updated more often, Audio Unit Player or Billie Tracker?

Audio Unit Player ships an update every 2 weeks, and Billie Tracker every 2 days. Most recently, Audio Unit Player was updated on October 9, 2026 and Billie Tracker on October 1, 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.*