# Mellowsound vs SynthMaster One for iPhone

The clearest difference is rating: SynthMaster One for iPhone at 4.7 against Mellowsound's 4.3. SynthMaster One for iPhone also leads on iOS requirement (10.0 vs 15.6). Mellowsound's advantage is device support (4 vs 2). On price, review sentiment, ratings volume and update cadence there is nothing between them.

Both are free to download. Mellowsound sells 2 one-off in-app purchases and SynthMaster One for iPhone sells 10 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

SynthMaster One for iPhone holds the better App Store score, 4.7 against 4.3. Both are backed by a comparable volume of ratings — 237 and 335 respectively. Written reviews point the same way: 60% of Mellowsound's written reviews are positive against 66% of SynthMaster One for iPhone's.

Mellowsound ships an update every 4 weeks, SynthMaster One for iPhone every 2 months. The most recent releases landed on November 4, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Mellowsound | SynthMaster One for iPhone |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.3 (237 ratings)](https://appshunter.io/ios/app/mellowsound-vintage-sampler/id1313209081/reviews) | **[4.7 (335 ratings)](https://appshunter.io/ios/app/synthmaster-one-for-iphone/id1490902617/reviews)** |
| Number of ratings | 237 | **335** |
| Positive reviews | 60.5% of reviews | **66.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 4 weeks** | Every 2 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 899 MB | 297 MB |
| Requires iOS | 15.6 | **10.0** |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Fingerlab](https://appshunter.io/developer/412786610) | [KV331 Audio](https://appshunter.io/developer/944155925) |

## What reviewers say

### Mellowsound

[App page](https://appshunter.io/ios/app/mellowsound-vintage-sampler/id1313209081)

Experience the iconic sounds of a 1960s keyboard sampler with this app. It offers professional audio quality, allowing you to play vintage orchestra sounds on your device. Customize your sound with various effects and recording options.

**Highlights:** Authentic Mellotron emulation, Professional 16-bit/44.1Khz audio, Photo-realistic user interface, Blend mode for two instruments, MIDI and Audio Unit support, In-app purchases for more instruments and FX

**Features:** Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Chamberlin Instruments Pack | $8.99 | one-time |
| Full Version | $9.99 | one-time |

**What reviewers like**

- 🎹 Authentic Mellotron sounds
- 🔊 Great sound quality
- 🎨 Nice visual design
- 💸 Good value for money
- 🔌 Integrates well with other apps

**What reviewers complain about**

- 🔇 Limited free version
- 🔒 Paywall for full functionality
- 🎹 Keyboard range limited to 3 octaves
- 🐛 Crashes and stability issues
- 🔋 High battery drain

**Reported bugs**

- Incompatibility with some iOS versions and devices
- Issues with Inter-App Audio and AUv3 functionality
- Keyboard not responsive or disappearing

**Requested features**

- Ability to blend/layer multiple instruments
- Expanded sound library with more Mellotron presets
- Sustain pedal support
- MIDI channel selection
- Improved performance in DAWs


### SynthMaster One for iPhone

[App page](https://appshunter.io/ios/app/synthmaster-one-for-iphone/id1490902617)

This powerful wavetable synthesizer app offers an intuitive workflow for creating new sounds. It features a rich library of wavetables, inspiring factory presets, and real-time modulation feedback for sound design.

**Highlights:** Wavetable synthesis, 300 factory presets, AUv3 support, Files App integration, Real-time modulation feedback, Semi-modular architecture, 32-step arpeggiator/sequencer

**In-app purchases (10)**

| 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 |
| NatLife Progressive&Deep Vol.1 | $4.99 | one-time |
| Vandalism Shocking Future Bass | $4.99 | one-time |
| Venus Theory Trap Sounds | $4.99 | one-time |
| Desktop Presets Upgrade | $9.99 | one-time |
| SM One Expansions Bundle | $24.99 | one-time |

**What reviewers like**

- ✨ Excellent sound quality
- 🤩 Incredible features for free
- 👍 Easy to use interface
- 🎛️ Versatile sound design capabilities
- 🎵 Great for GarageBand integration

**What reviewers complain about**

- 🐛 Frequent crashes
- 🔌 Issues with GarageBand integration
- 💸 In-app purchase problems
- 🔄 Presets not saving
- 📉 App appears abandoned

**Reported bugs**

- App crashes when loading saved presets
- App crashes when setting default sound
- AUv3 option disappears in GarageBand
- Inability to reload user patches without crashing
- Inability to purchase certain IAP packs

**Requested features**

- Fix in-app purchase issues
- Improve GarageBand AUv3 stability
- Enable saving of custom presets
- Address crashing when loading presets
- Fix note pitch issues


## Frequently asked questions

### Is Mellowsound free?

Mellowsound is free to download, with in-app purchases available.

### Is SynthMaster One for iPhone free?

SynthMaster One for iPhone is free to download, with in-app purchases available.

### Which has better reviews, Mellowsound or SynthMaster One for iPhone?

SynthMaster One for iPhone is rated higher. Mellowsound averages 4.3 out of 5 from 237 ratings, while SynthMaster One for iPhone averages 4.7 from 335 ratings.

### Do Mellowsound or SynthMaster One for iPhone have ads?

Neither Mellowsound nor SynthMaster One for iPhone shows ads.

### Which is updated more often, Mellowsound or SynthMaster One for iPhone?

Mellowsound ships an update every 4 weeks, and SynthMaster One for iPhone every 2 months. Most recently, Mellowsound was updated on November 4, 2026 and SynthMaster One for iPhone on November 3, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*