Transfer Function vs QUESTRA Panels
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Transfer Function
This app performs dual-FFT acoustic analysis for sound systems, including music. It offers magnitude, phase, and coherence graphs, a delay finder, and a signal generator. It can operate with internal microphones or external audio interfaces for comprehensive sound system monitoring and equalization.
- Dual-FFT acoustic analysis
- Magnitude, Phase, Coherence graphs
- Delay Finder
- Signal Generator
- Music as signal source
- Internal microphone support
- Two-channel audio interface compatibility
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Transfer Function is a dual-FFT acoustic analysis app that is used for sound system audio analysis. Since it can operate with music as the signal source, it can be used during a musical performance to monitor and turn the system equalization during the show. Transfer function includes: -- Magnitude Graph -- Phase Graph -- Coherence Plot -- Delay Finder -- Signal Generator Normally a transfer function requires a two-channel interface, and that is true with this one, also, if you want to use it with program material (music). However, you can use our Transfer Funciton with the internal iOS microphone, if you can send the pink noise generator output to the sound system input. In this configuration, the internal generator is routed back to the input as the reference channel. You can measure delay, magnitude, and phase using this setup. When you use Transfer Function with a two-channel audio interface to run, such as the Studio Six Digital iAudioInterface2, then you can also use any audio source as the test signal, including music. See our website for more information.
QUESTRA Panels
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QUESTRA® Panels serve as the control center for networked LD Systems installation solutions. Using QUESTRA® Software you can design simple and intuitive interfaces which allow easy control of your system. Simply download QUESTRA® Panels on your iOS device, assign your custom panel design to the device, and you're ready to control. Designed as an integral part of QUESTRA®, QUESTRA® Panels is your interface to control and manage your system. Please note: 1. QUESTRA® v1.4.20 is required 2. This application is for controlling functionality only, not for creating or modifying panels. 3. QUESTRA® Panels requires the setup and design process to be handled by the QUESTRA® Software. With the QUESTRA® Software for Windows, you have the freedom to design and customize your panel functionality with its built-in editor. You can create users, assign specific roles, restrict access to certain functions, and ensure that critical network settings remain unmodified.
Screenshots
Verdict
The clearest difference is price: QUESTRA Panels at Free against Transfer Function's $49.99. QUESTRA Panels also leads on in-app purchases (none vs 1) and update cadence (every 5 weeks vs every 6 months). On ads and device support 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
QUESTRA Panels is free to download; Transfer Function costs $49.99 up front. Transfer Function sells 1 one-off in-app purchase. QUESTRA Panels asks for nothing beyond the download.
Transfer Function ships an update every 6 months, QUESTRA Panels every 5 weeks. The most recent releases landed on September 24, 2026 and September 12, 2026 respectively.
| Parameter | Transfer Function | QUESTRA Panels |
|---|---|---|
| Price | $49.99 | Free — better |
| Rating | 3.0 (2 ratings) — better | — |
| Positive reviews | 25.0% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 6 months | Every 5 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 33 MB | 67 MB |
| Age rating | 4+ | 4+ |
| Developer | Andrew Smith | ADAM HALL GMBH |
In-app purchases
Transfer Function
- Reference Curves Option$14.99
QUESTRA Panels
No in-app purchases









