Comparison

Transfer Function vs PlayBacker for iPad

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

PlayBacker for iPad

Read full description

■ Loading Audio File From - Music Library in device ( Apple Music not supported ) - In App Storage / File Sync - iCloud Drive - and other file providers ■ Decks + Cross Fader - Auto Pause / Auto Cue - Repeat ( 1 track / all tracks ) - Skip Tail ( of silence end of file ) - Volume Fader - CueList Mode - Mono Sum / Pan Pod - Auto Cross Fade ( period changeable ) ■ SamplePad - 3×3 / 4×4 Layout changeable - Single Play / Multi Play Mode - 1 Shot Play / Loop Play Pad Mode ■ Track Editor - Mounted on CueList Mode view - Title, Gain and Start Cue Points etc of each track are editable ■ Remote Controls - Supports ‘Control Center’ ( DECK A only ) - Supports remote control by keyboard shortcuts of external keyboards - Supports remote control by external (Bluetooth included) MIDI devices

Screenshots

Transfer Function3 screens

Verdict

The call

The clearest difference is price: PlayBacker for iPad at $15.99 against Transfer Function's $49.99. PlayBacker for iPad also leads on in-app purchases (none vs 1). Transfer Function's advantage is device support (3 vs 1). On update cadence, ads and iOS requirement 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

Transfer Function costs $49.99 and PlayBacker for iPad $15.99 up front. Transfer Function sells 1 one-off in-app purchase. PlayBacker for iPad asks for nothing beyond the download.

UpkeepUpdate frequency

Transfer Function ships an update every 6 months, PlayBacker for iPad every 4 months. The most recent releases landed on September 24, 2026 and February 20, 2026 respectively.

Scorecard3 real differences · 7 level
Transfer Function versus PlayBacker for iPad: the parameters behind the verdict, then further details
ParameterTransfer FunctionPlayBacker for iPad
Price$49.99$15.99 — better
Rating3.0 (2 ratings) — better—
Positive reviews25.0% of reviews—
Number of ratings2 — better—
Update frequencyEvery 6 monthsEvery 4 months — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationPaid—
DevicesiPhone, iPad, iPod — betteriPad
Requires iOS15.014.0 — better
Further details — not scored
Size33 MB12 MB
Age rating4+4+
DeveloperAndrew SmithINTEGRAL SOUND DESIGN

In-app purchases

1 purchases

Transfer Function

One-time1
  • Reference Curves Option$14.99
None

PlayBacker for iPad

No in-app purchases

Questions

Is Transfer Function free?
Transfer Function costs $49.99, and also offers in-app purchases.
Is PlayBacker for iPad free?
PlayBacker for iPad costs $15.99, with no in-app purchases.
Do Transfer Function or PlayBacker for iPad have ads?
Neither Transfer Function nor PlayBacker for iPad shows ads.
Which is updated more often, Transfer Function or PlayBacker for iPad?
Transfer Function ships an update every 6 months, and PlayBacker for iPad every 4 months. Most recently, Transfer Function was updated on September 24, 2026 and PlayBacker for iPad on February 20, 2026.

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