# User Scale vs Sonic Synth

The clearest difference is review sentiment: User Scale at 100% against Sonic Synth's 0%. User Scale also leads on price (Free vs $1.99) and rating (3.5 vs 3.0). Sonic Synth's advantage is update cadence (every 6 months vs every 13 months) and device support (3 vs 1). On ratings volume, ads and in-app purchases there is nothing between them.

User Scale is free to download; Sonic Synth costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

User Scale holds the better App Store score, 3.5 against 3.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively. Written reviews point the same way: 100% of User Scale's written reviews are positive against 0% of Sonic Synth's.

User Scale ships an update every 13 months, Sonic Synth every 6 months. The most recent releases landed on June 5, 2026 and August 14, 2026 respectively.

## The numbers

| Metric | User Scale | Sonic Synth |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | **[3.5 (2 ratings)](https://appshunter.io/ios/app/user-scale/id579231060/reviews)** | [3.0 (1 ratings)](https://appshunter.io/ios/app/sonic-synth-fm-synthesizer/id1104940736/reviews) |
| Number of ratings | **2** | 1 |
| Positive reviews | **100.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 6 months** |
| Monetization | **Free** | Paid |
| Size | 8 MB | 9 MB |
| Requires iOS | **8.1** | 10.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Roland Corporation](https://appshunter.io/developer/387333694) | [Aleksandar Mlazev](https://appshunter.io/developer/1093798140) |

## What reviewers say

### User Scale

[App page](https://appshunter.io/ios/app/user-scale/id579231060)

This iPad application allows musicians to control the tuning scale of their Roland instruments. It enables real-time adjustments to key tunings, applying consistent values across notes of the same name during performances.

**Highlights:** Control tuning scale with iPad, Change instrument key tunings, Apply consistent tuning values, Real-time performance control

**In-app purchases:** none


### Sonic Synth

[App page](https://appshunter.io/ios/app/sonic-synth-fm-synthesizer/id1104940736)

Create a wide variety of sounds with this FM synthesizer app. It features three independent oscillators, each capable of generating four unique waveforms, and offers a responsive touch keyboard for real-time performance. Enjoy high-quality audio with a 44100 Hz sample rate.

**Highlights:** 3 independent oscillators, 4 waveform types per oscillator, Volume, modulation, tone, and detune controls, Envelope filters (attack, sustain, release), Multitouch support, Responsive piano keyboard, Core MIDI support

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is User Scale free?

User Scale is free to download, with no in-app purchases.

### Is Sonic Synth free?

Sonic Synth costs $1.99, with no in-app purchases.

### Which has better reviews, User Scale or Sonic Synth?

User Scale is rated higher. User Scale averages 3.5 out of 5 from 2 ratings, while Sonic Synth averages 3.0 from 1 ratings.

### Do User Scale or Sonic Synth have ads?

Neither User Scale nor Sonic Synth shows ads.

### Which is updated more often, User Scale or Sonic Synth?

User Scale ships an update every 13 months, and Sonic Synth every 6 months. Most recently, User Scale was updated on June 5, 2026 and Sonic Synth on August 14, 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.*