User Scale vs Sonic Synth
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
User Scale
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.
- Control tuning scale with iPad
- Change instrument key tunings
- Apply consistent tuning values
- Real-time performance control
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This software application for iPad lets you change the tuning scale of your Roland musical instrument. When using User Scale you can: • Play your Roland musical instrument while controlling the tuning scale of your performance with your iPad • Change the tuning of your musical instrument’s keys. Apply the same values to all notes of the same name App requires: - Apple iPad Camera Connection Kit (camera connectors made by Apple Inc.) and USB cable (type A–male to type B–male, commercially available) -or- - Roland musical instrument that supports the wireless LAN function
Sonic Synth
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.
- 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
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Sonic Synth is very capable FM Synthesizer app with 3 oscillators. Every oscillator is independent and can generate 4 wave forms. The app works with 44100 Hz sample rate so the sound quality is great. Core MIDI - support for MIDI keyboards via USB The touch keyboard is also very responsive and dynamic - feels like a real instrument. Keys are big enough. The last wave form is our secret algorithm for string sound also generated by the oscillators. Variety of sounds can be created and even changed real time while you are playing using the setting of the 3 oscillators of the synthesizer. Sonic Synth main features: - 3 oscillators - 4 wave form types for every oscillator - volume, modulation, tone and detune for every oscillator - envelope filters (attack sustain release) - multitouch - fast and usable piano keyboard You can now use your phone or tablet as a recording instrument.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | User Scale | Sonic Synth |
|---|---|---|
| Price | Free — better | $1.99 |
| Rating | 3.5 (2 ratings) — better | 3.0 (1 ratings) |
| Positive reviews | 100.0% of reviews — better | 0.0% of reviews |
| Number of ratings | 2 — better | 1 |
| Update frequency | Every 13 months | Every 6 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 8.1 — better | 10.0 |
| Further details — not scored | ||
| Size | 8 MB | 9 MB |
| Age rating | 4+ | 4+ |
| Developer | Roland Corporation | Aleksandar Mlazev |
Customer experience
User Scale
Sonic Synth
In-app purchases
User Scale
No in-app purchases
Sonic Synth
No in-app purchases
