# SynthMaster One vs ButterSynth

The clearest difference is price: SynthMaster One at $9.99 against ButterSynth's $19.99. SynthMaster One also leads on rating (4.7 vs 4.0) and ratings volume (743 vs 62). ButterSynth's advantage is in-app purchases (none vs 11) and chart position (#190 vs unranked). On review sentiment, update cadence, ads and device support there is nothing between them.

SynthMaster One costs $9.99 and ButterSynth $19.99 up front. SynthMaster One sells 11 one-off in-app purchases. ButterSynth asks for nothing beyond the download.

SynthMaster One holds the better App Store score, 4.7 against 4.0. That said, the two scores are not equally well evidenced: SynthMaster One has 743 ratings behind it against 62, so its average is the more settled of the two. Written reviews point the same way: 64% of SynthMaster One's written reviews are positive against 60% of ButterSynth's.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on September 22, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | SynthMaster One | ButterSynth |
| --- | --- | --- |
| Price | **$9.99** | $19.99 |
| Rating | **[4.7 (743 ratings)](https://appshunter.io/ios/app/synthmaster-one/id1254353266/reviews)** | [4.0 (62 ratings)](https://appshunter.io/ios/app/buttersynth/id1497419006/reviews) |
| Number of ratings | **743** | 62 |
| Positive reviews | **63.8% of reviews** | 59.6% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | **Free with in-app purchases** | Paid |
| Best chart rank | — | **#190** |
| Size | 402 MB | 468 MB |
| Requires iOS | **10.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [KV331 Audio](https://appshunter.io/developer/944155925) | [Arto Vaarala](https://appshunter.io/developer/890886114) |

## What reviewers say

### SynthMaster One

[App page](https://appshunter.io/ios/app/synthmaster-one/id1254353266)

This powerful wavetable synthesizer app offers an intuitive workflow for creating unique sounds. It features a rich library of wavetables, inspiring presets, and a semi-modular architecture for deep sound design. Easily sync data across devices and integrate with DAWs.

**Highlights:** Wavetable synthesis, Semi-modular architecture, 650 factory presets, AUv3 support, Cross-platform cloud sync, Real-time modulation feedback, 32-step arpeggiator/sequencer

**In-app purchases (11)**

| Purchase | Price | Billing |
| --- | --- | --- |
| BigTone Club Construction Set | $4.99 | one-time |
| True Trance Sounds Volume 1 | $4.99 | one-time |
| Vandalism Future House | $4.99 | one-time |
| NatLife Retrowave Sounds Vol.1 | $4.99 | one-time |
| Demis Hellen Euphoric Trance | $4.99 | one-time |
| Venus Theory Trap Sounds | $4.99 | one-time |
| Vandalism Shocking Future Bass | $4.99 | one-time |
| NatLife Progressive&Deep Vol.1 | $4.99 | one-time |
| Bluffmunkey Cinematic Sounds | $4.99 | one-time |
| Desktop Presets Upgrade | $7.99 | one-time |
| SM One Expansions Bundle | $24.99 | one-time |

**What reviewers like**

- 🚀 Powerful synth engine
- 👍 Extensive preset library
- 🎨 Versatile sound design capabilities
- 💡 Free desktop version expansions on iPad
- 🎹 Excellent sound quality and tone

**What reviewers complain about**

- 🐛 Crashes and stability issues
- 🔋 Battery drain in background
- 🤔 Confusing in-app purchase system
- 👎 UI/UX could use improvement
- 🔇 Audio issues and no sound

**Reported bugs**

- Stuck notes and MIDI issues
- Preset loading crashes
- Restore purchases not working
- Incompatibility with certain DAWs

**Requested features**

- Add custom wavetable support
- Improve MIDI mapping and MPE functionality
- Optimize performance on older devices
- Streamline preset management and browsing


### ButterSynth

[App page](https://appshunter.io/ios/app/buttersynth/id1497419006)

**Currently charting:** #190 Top Paid · Music (US App Store)

This powerful synthesizer app offers a hybrid approach, combining wavetable, FM, and sample-based synthesis. Create unique sounds with a vast sonic range, advanced modulation, and a built-in effects rack. It caters to both experienced sound designers and beginners with extensive presets.

**Highlights:** Hybrid 6-oscillator synthesis (wavetable, FM, sample), Built-in wavetable editor, FM engine with 4 operators, Sample and Granulator engines, 32-slot modulation matrix, Internal FX rack with 16 modules, Extensive preset library

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- ✨ Deep sound design capabilities
- 🎛️ Versatile modulation matrix
- 🔊 Great sound quality
- 💡 Innovative wavetable generator
- 🌟 Serum-like experience

**What reviewers complain about**

- 📱 Fiddly on small screens
- 🐛 Crashes frequently
- 🐛 Disappears in Cubasis
- 🐛 Spikes CPU usage
- 🐛 Crashes on patch change

**Reported bugs**

- App crashing with AUM
- Disappears in Cubasis randomly
- Crashes all the time inside Logic
- Changing a patch spikes CPU to 99%
- Crashes on every patch change

**Requested features**

- MPE popup possible on top of the auv3
- Button to hide built-in keyboard
- Buffer size option
- Additional MIDI mappings (e.g., arpeggiator toggle)
- Sustain pedal support


## Frequently asked questions

### Is SynthMaster One free?

SynthMaster One costs $9.99, and also offers in-app purchases.

### Is ButterSynth free?

ButterSynth costs $19.99, with no in-app purchases.

### Which has better reviews, SynthMaster One or ButterSynth?

SynthMaster One is rated higher. SynthMaster One averages 4.7 out of 5 from 743 ratings, while ButterSynth averages 4.0 from 62 ratings.

### Do SynthMaster One or ButterSynth have ads?

Neither SynthMaster One nor ButterSynth shows ads.

### Which is updated more often, SynthMaster One or ButterSynth?

SynthMaster One ships an update every 2 months, and ButterSynth every 2 months. Most recently, SynthMaster One was updated on September 22, 2026 and ButterSynth on September 16, 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.*