Comparison

Transfer Function vs QUESTRA Panels

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Dual-FFT acoustic analysis
  • Magnitude, Phase, Coherence graphs
  • Delay Finder
  • Signal Generator
  • Music as signal source
  • Internal microphone support
  • Two-channel audio interface compatibility
Features
Read full description

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.

About

QUESTRA Panels

Features
Read full description

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

Transfer Function3 screens
QUESTRA Panels4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

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.

Scorecard4 real differences · 6 level
Transfer Function versus QUESTRA Panels: the parameters behind the verdict, then further details
ParameterTransfer FunctionQUESTRA Panels
Price$49.99Free — better
Rating3.0 (2 ratings) — better—
Positive reviews25.0% of reviews—
Number of ratings2 — better—
Update frequencyEvery 6 monthsEvery 5 weeks — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationPaid—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.012.0 — better
Further details — not scored
Size33 MB67 MB
Age rating4+4+
DeveloperAndrew SmithADAM HALL GMBH

In-app purchases

1 purchases

Transfer Function

One-time1
  • Reference Curves Option$14.99
None

QUESTRA Panels

No in-app purchases

Questions

Is Transfer Function free?
Transfer Function costs $49.99, and also offers in-app purchases.
Is QUESTRA Panels free?
QUESTRA Panels is free to download, with no in-app purchases.
Do Transfer Function or QUESTRA Panels have ads?
Neither Transfer Function nor QUESTRA Panels shows ads.
Which is updated more often, Transfer Function or QUESTRA Panels?
Transfer Function ships an update every 6 months, and QUESTRA Panels every 5 weeks. Most recently, Transfer Function was updated on September 24, 2026 and QUESTRA Panels on September 12, 2026.

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