User Scale vs Spectrum AUv3 FFT Visualizer
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
Spectrum AUv3 FFT Visualizer
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Turn sound into stunning visuals with Spectrum, an AUv3-compatible real-time spectrum analyzer for audio signals. Effortlessly monitor 29 specific frequencies from 10 Hz to 20 kHz with precision, powered by Fast Fourier Transform (FFT) data. Spectrum’s sleek graphics feature vertical markers, filled paths, and a smooth gradient background for an immersive visual experience. Enjoy accurate frequency placement with logarithmic scaling, and interact seamlessly using touch to highlight specific frequencies. Designed for performance, it dynamically adjusts to real-time data, transforms decibels, and ensures smooth, optimized rendering for flawless updates.
Screenshots
Verdict
The clearest difference is price: User Scale at Free against Spectrum AUv3 FFT Visualizer's $0.99. User Scale also leads on iOS requirement (8.1 vs 15.0). Spectrum AUv3 FFT Visualizer's advantage is device support (3 vs 1). On update cadence, 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; Spectrum AUv3 FFT Visualizer costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
User Scale ships an update every 13 months, Spectrum AUv3 FFT Visualizer every 12 months. The most recent releases landed on September 30, 2026 and October 1, 2026 respectively.
| Parameter | User Scale | Spectrum AUv3 FFT Visualizer |
|---|---|---|
| Price | Free — better | $0.99 |
| Rating | 3.5 (2 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 13 months | Every 12 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 8.1 — better | 15.0 |
| Further details — not scored | ||
| Size | 8 MB | 10 MB |
| Age rating | 4+ | 4+ |
| Developer | Roland Corporation | DiscoDSP LLC |
In-app purchases
User Scale
No in-app purchases
Spectrum AUv3 FFT Visualizer
No in-app purchases
Questions
Is User Scale free?
Is Spectrum AUv3 FFT Visualizer free?
Do User Scale or Spectrum AUv3 FFT Visualizer have ads?
Which is updated more often, User Scale or Spectrum AUv3 FFT Visualizer?
Other comparisons
