# Transfer Function vs LM AUDIO

The clearest difference is price: LM AUDIO at Free against Transfer Function's $49.99. LM AUDIO also leads on in-app purchases (none vs 1) and iOS requirement (7.0 vs 15.0). Transfer Function's advantage is review sentiment (25% vs 0%). On update cadence, ads and device support there is nothing between them.

LM AUDIO is free to download; Transfer Function costs $49.99 up front. Transfer Function sells 1 one-off in-app purchase. LM AUDIO asks for nothing beyond the download.

Transfer Function ships an update every 6 months, LM AUDIO every 3 months. The most recent releases landed on September 24, 2026 and June 4, 2026 respectively.

## The numbers

| Metric | Transfer Function | LM AUDIO |
| --- | --- | --- |
| Price | $49.99 | **Free** |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/transfer-function/id824037130/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | **25.0% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 3 months** |
| Monetization | Paid | **Free** |
| Size | 33 MB | 3 MB |
| Requires iOS | 15.0 | **7.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Andrew Smith](https://appshunter.io/developer/291822462) | [PT. Kramat Motor](https://appshunter.io/developer/1280833868) |

## 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 |


### LM AUDIO

[App page](https://appshunter.io/ios/app/lm-audio/id1118657152)

This application allows users to control various audio settings for car amplifiers with integrated DSP. Adjust EQ, bass, 3D sound, time alignment, and filters. Save and load sound settings directly from your phone or the amplifier.

**Highlights:** DSP control, EQ adjustment, Bass and 3D sound settings, Time alignment, Filter control, Save sound settings to phone, Save sound settings to amplifier

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Transfer Function free?

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

### Is LM AUDIO free?

LM AUDIO is free to download, with no in-app purchases.

### Do Transfer Function or LM AUDIO have ads?

Neither Transfer Function nor LM AUDIO shows ads.

### Which is updated more often, Transfer Function or LM AUDIO?

Transfer Function ships an update every 6 months, and LM AUDIO every 3 months. Most recently, Transfer Function was updated on September 24, 2026 and LM AUDIO on June 4, 2026.

---

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