# AUM vs SynthMaster 2

The clearest difference is price: SynthMaster 2 at $14.99 against AUM's $24.99. SynthMaster 2 also leads on update cadence (every 3 weeks vs every 3 months). AUM's advantage is ads (none vs shown) and review sentiment (82% vs 68%). On rating, ratings volume, in-app purchases and monetization model there is nothing between them.

AUM costs $24.99 and SynthMaster 2 $14.99 up front. AUM sells 4 one-off in-app purchases and SynthMaster 2 sells 32 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.7 for AUM against 4.8 for SynthMaster 2. Both are backed by a comparable volume of ratings — 524 and 451 respectively. Written reviews are what separate them: 82% of AUM's written reviews are positive against 68% of SynthMaster 2's.

AUM ships an update every 3 months, SynthMaster 2 every 3 weeks. The most recent releases landed on September 22, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | AUM | SynthMaster 2 |
| --- | --- | --- |
| Price | $24.99 | **$14.99** |
| Rating | [4.7 (524 ratings)](https://appshunter.io/ios/app/aum-audio-mixer/id1055636344/reviews) | **[4.8 (451 ratings)](https://appshunter.io/ios/app/synthmaster-2/id1566704584/reviews)** |
| Number of ratings | **524** | 451 |
| Positive reviews | **82.1% of reviews** | 68.5% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Best chart rank | **#91** | — |
| Size | 13 MB | 918 MB |
| Requires iOS | **12.0** | 15 |
| Devices | **iPhone, iPad, iPod** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Kymatica AB](https://appshunter.io/developer/522046659) | [KV331 Audio](https://appshunter.io/developer/944155925) |

## What reviewers say

### AUM

[App page](https://appshunter.io/ios/app/aum-audio-mixer/id1055636344)

**Currently charting:** #91 Top Paid · Music (US App Store)

This app is a versatile audio mixer, recorder, and connection hub for mobile devices. It allows users to connect various audio sources, route signals, apply effects, and record mixes with high fidelity. It supports advanced features like MIDI control, synchronization, and integration with other audio apps and hardware.

**Highlights:** Connect hardware inputs/outputs, Route audio and MIDI, Host Audio Unit extensions, Record mixes and individual tracks, Synchronize with Ableton Link, Built-in processing nodes, MIDI control and routing

**Features:** Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Small Tip | $0.99 | one-time |
| Medium Tip | $1.99 | one-time |
| Large Tip | $4.99 | one-time |
| Huge Tip | $9.99 | one-time |

**What reviewers like**

- 👍 Excellent audio routing and mixing capabilities
- 🚀 Powerful and flexible workflow
- 💡 Seamless integration with AUv3 and IAA apps
- 👍 Intuitive and clean user interface
- 👍 Reliable and stable performance

**What reviewers complain about**

- 🐛 Occasional crashes or stability issues
- 💡 Lack of MIDI clock sync receive functionality
- 💡 Limited visual customization options (e.g. channel sizes)
- 🐛 Compatibility issues with some hardware interfaces

**Reported bugs**

- Crashes or freezes when using certain plugin combinations
- Compatibility issues with iOS 15 and newer
- Inconsistent MIDI transport controls

**Requested features**

- Add MIDI clock sync receive capability
- Implement a timeline/sequencer view
- Provide more visual customization options
- Improve support for external hardware integration


### SynthMaster 2

[App page](https://appshunter.io/ios/app/synthmaster-2/id1566704584)

This powerful software synthesizer offers a vast array of sound design capabilities, including multiple oscillator modes, extensive modulation options, and a wide selection of filters. Explore over 1000 factory presets or create your own unique sounds. Available as a standalone app or AUv3 plugin.

**Highlights:** Multiple oscillator modes (Basic, Additive, Wavetable, Vector), Extensive modulation architecture, 6 filter categories, Import custom wave files, 1000+ factory presets, Standalone app and AUv3 plugin

**In-app purchases (32)**

| Purchase | Price | Billing |
| --- | --- | --- |
| BigTone Tableworks Vol.2 | $1.99 | one-time |
| Burak Yeter Synth Sounds Vol1 | $1.99 | one-time |
| Aiyn Zahev Expansion 1 | $1.99 | one-time |
| BigTone Tableworks Vol.1 | $1.99 | one-time |
| Michael Kastrup Expansion | $1.99 | one-time |
| EDM Stars Volume 1 | $1.99 | one-time |
| Nori Ubukata Pop Hits Vol.4 | $1.99 | one-time |
| Rob Lee EDM Expansion Vol.2 | $1.99 | one-time |
| Alonso Sound Future Rave | $1.99 | one-time |
| Nori Ubukata Pop Hits Vol.1 | $1.99 | one-time |
| BigTone Techno Bits Vol.1 | $1.99 | one-time |
| Club Sequences Vol.1 | $2.99 | one-time |
| Historical Synth Giants Vol.3 | $2.99 | one-time |
| Dawn of Electronic Music Vol.2 | $2.99 | one-time |
| Nori Ubukata Art Rock Basics | $2.99 | one-time |
| BigTone Analog Basics 02 | $4.99 | one-time |
| BigTone Analog Basics | $4.99 | one-time |
| BigTone Signature Sounds Vol.1 | $4.99 | one-time |
| NU Sounds of the World | $4.99 | one-time |
| Historical Synth Giants Vol.4 | $4.99 | one-time |
| Historical Synth Giants Vol.1 | $4.99 | one-time |
| Historical Synth Giants Vol.2 | $4.99 | one-time |
| Japan Vintage | $4.99 | one-time |
| NatLife Future Bass Sounds | $4.99 | one-time |
| Danyella EDM Expansion Vol.1 | $4.99 | one-time |
| Dawn of Electronic Music Vol.1 | $4.99 | one-time |
| Dawn of Electronic Music Vol.3 | $4.99 | one-time |
| Rob Lee EDM Expansion Vol.3 | $4.99 | one-time |
| Natlife Disco Funk | $4.99 | one-time |
| Insigne Essentials 4 Clubbin | $4.99 | one-time |
| Desktop Presets Upgrade | $9.99 | one-time |
| All Expansions Bundle | $49.99 | one-time |

**What reviewers like**

- 🚀 Best synth on iPad
- 👍 Delicious sound
- 👍 Tremendously powerful synth
- 👍 Great synth with complex possibilities and great sound(s)
- 👍 Perfeito

**What reviewers complain about**

- 🐛 Auswahl der Modulationsquellen funktioniert nicht richtig
- 🐛 Echt schlecht
- 🐛 Broken Preset System for a powerful synth
- 🐛 Please fix the OSC behavior on Square and Saw
- 🐛 Preset issues

**Reported bugs**

- Presets not loading correctly
- Modulation not working after loading project
- Skin resets to default
- App crashes frequently

**Requested features**

- Pitch bend/glide for imported samples
- Integration with AUM audio mixer


## Frequently asked questions

### Is AUM free?

AUM costs $24.99, and also offers in-app purchases.

### Is SynthMaster 2 free?

SynthMaster 2 costs $14.99, and also offers in-app purchases.

### Which has better reviews, AUM or SynthMaster 2?

SynthMaster 2 is rated higher. AUM averages 4.7 out of 5 from 524 ratings, while SynthMaster 2 averages 4.8 from 451 ratings.

### Do AUM or SynthMaster 2 have ads?

SynthMaster 2 shows ads; AUM does not.

### Which is updated more often, AUM or SynthMaster 2?

AUM ships an update every 3 months, and SynthMaster 2 every 3 weeks. Most recently, AUM was updated on September 22, 2026 and SynthMaster 2 on September 23, 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.*