# Transfer Function vs Open Sound Meter

The clearest difference is review sentiment: Open Sound Meter at 100% against Transfer Function's 25%. Open Sound Meter also leads on rating (5.0 vs 3.0) and in-app purchases (none vs 1). Transfer Function's advantage is price ($49.99 vs $69.99). On ratings volume, ads, monetization model and device support there is nothing between them.

Transfer Function costs $49.99 and Open Sound Meter $69.99 up front. Transfer Function sells 1 one-off in-app purchase. Open Sound Meter asks for nothing beyond the download.

Open Sound Meter holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 2 and 5 respectively. Written reviews point the same way: 25% of Transfer Function's written reviews are positive against 100% of Open Sound Meter's.

Transfer Function ships an update every 6 months, Open Sound Meter every 2 months. The most recent releases landed on September 24, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | Transfer Function | Open Sound Meter |
| --- | --- | --- |
| Price | **$49.99** | $69.99 |
| Rating | [3.0 (2 ratings)](https://appshunter.io/ios/app/transfer-function/id824037130/reviews) | **[5.0 (5 ratings)](https://appshunter.io/ios/app/open-sound-meter/id1552933259/reviews)** |
| Number of ratings | 2 | **5** |
| Positive reviews | 25.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 2 months** |
| Monetization | Paid | Paid |
| Size | 33 MB | 45 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | +4 |
| Developer | [Andrew Smith](https://appshunter.io/developer/291822462) | [Pavel Smokotnin](https://appshunter.io/developer/1552933261) |

## 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 |


### Open Sound Meter

[App page](https://appshunter.io/ios/app/open-sound-meter/id1552933259)

This application allows real-time tuning and control of audio systems. It provides comprehensive measurement and analysis tools for various audio parameters, with options to store, adjust, and average results. Calibration files and direct console connections enhance measurement accuracy.

**Highlights:** Real-time audio system tuning, Spectrum, SPL, Magnitude, Phase analysis, Store, adjust, and average measurements, Apply calibration files for microphones, Direct connection to mixing consoles, Project saving to device or iCloud

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

**In-app purchases:** none


## Frequently asked questions

### Is Transfer Function free?

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

### Is Open Sound Meter free?

Open Sound Meter costs $69.99, with no in-app purchases.

### Which has better reviews, Transfer Function or Open Sound Meter?

Open Sound Meter is rated higher. Transfer Function averages 3.0 out of 5 from 2 ratings, while Open Sound Meter averages 5.0 from 5 ratings.

### Do Transfer Function or Open Sound Meter have ads?

Neither Transfer Function nor Open Sound Meter shows ads.

### Which is updated more often, Transfer Function or Open Sound Meter?

Transfer Function ships an update every 6 months, and Open Sound Meter every 2 months. Most recently, Transfer Function was updated on September 24, 2026 and Open Sound Meter on September 11, 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.*