# Transfer Function vs AV Synth

The clearest difference is review sentiment: AV Synth at 100% against Transfer Function's 25%. AV Synth also leads on price (Free vs $49.99) and rating (4.0 vs 3.0). Transfer Function's advantage is iOS requirement (15.0 vs 17.0). On ratings volume, ads, in-app purchases and device support there is nothing between them.

AV Synth is free to download; Transfer Function costs $49.99 up front. Transfer Function sells 1 one-off in-app purchase and AV Synth sells 2 in-app purchases, starting at $6.99 per 7 days. Whichever you choose, the download price is not the number that matters.

AV Synth holds the better App Store score, 4.0 against 3.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively. Written reviews point the same way: 25% of Transfer Function's written reviews are positive against 100% of AV Synth's.

Transfer Function ships an update every 6 months, AV Synth every 3 days. The most recent releases landed on September 24, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | Transfer Function | AV Synth |
| --- | --- | --- |
| Price | $49.99 | **Free** |
| Rating | [3.0 (2 ratings)](https://appshunter.io/ios/app/transfer-function/id824037130/reviews) | **[4.0 (1 ratings)](https://appshunter.io/ios/app/av-synth-visual-synthesizer/id6755874182/reviews)** |
| Number of ratings | **2** | 1 |
| Positive reviews | 25.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 3 days** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 33 MB | 40 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Andrew Smith](https://appshunter.io/developer/291822462) | [Marvin Krueger](https://appshunter.io/developer/1152894281) |

## What reviewers say

### Transfer Function

[App page](https://appshunter.io/ios/app/transfer-function/id824037130)

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:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Reference Curves Option | $14.99 | one-time |


### AV Synth

[App page](https://appshunter.io/ios/app/av-synth-visual-synthesizer/id6755874182)

Create dynamic, layered visual compositions that react to live music. Design and modulate up to five independent visual layers with complex effect chains. Save and recall presets for live performance or studio use.

**Highlights:** Layered visual compositions, Live audio-reactive graphics, Chained effect processing, Parameter automation, Saveable presets, High-quality video recording (PRO), NDI network streaming (PRO)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| AV PRO Weekly | $6.99 | per 7 days |
| AV Pro Yearly | $39.99 | per year |


## Frequently asked questions

### Is Transfer Function free?

Transfer Function costs $49.99, and also offers in-app purchases.

### Is AV Synth free?

AV Synth is free to download, with in-app purchases available.

### Which has better reviews, Transfer Function or AV Synth?

AV Synth is rated higher. Transfer Function averages 3.0 out of 5 from 2 ratings, while AV Synth averages 4.0 from 1 ratings.

### Do Transfer Function or AV Synth have ads?

Neither Transfer Function nor AV Synth shows ads.

### Which is updated more often, Transfer Function or AV Synth?

Transfer Function ships an update every 6 months, and AV Synth every 3 days. Most recently, Transfer Function was updated on September 24, 2026 and AV Synth on September 9, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*