# Transfer Function vs KORG cortosia

The clearest difference is price: KORG cortosia at $9.99 against Transfer Function's $49.99. KORG cortosia also leads on rating (4.2 vs 3.0) and in-app purchases (none vs 1). On ads, monetization model and device support there is nothing between them.

Transfer Function costs $49.99 and KORG cortosia $9.99 up front. Transfer Function sells 1 one-off in-app purchase. KORG cortosia asks for nothing beyond the download.

KORG cortosia holds the better App Store score, 4.2 against 3.0. Both are backed by a comparable volume of ratings — 2 and 6 respectively. Written reviews point the same way: 25% of Transfer Function's written reviews are positive against 48% of KORG cortosia's.

Transfer Function ships an update every 6 months, KORG cortosia every 2 months. The most recent releases landed on September 24, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Transfer Function | KORG cortosia |
| --- | --- | --- |
| Price | $49.99 | **$9.99** |
| Rating | [3.0 (2 ratings)](https://appshunter.io/ios/app/transfer-function/id824037130/reviews) | **[4.2 (6 ratings)](https://appshunter.io/ios/app/korg-cortosia/id952982019/reviews)** |
| Number of ratings | 2 | **6** |
| Positive reviews | 25.0% of reviews | **47.8% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 2 months** |
| Monetization | Paid | Paid |
| Best chart rank | — | **#190** |
| Size | 33 MB | 35 MB |
| Requires iOS | 15.0 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Andrew Smith](https://appshunter.io/developer/291822462) | [KORG INC.](https://appshunter.io/developer/363714046) |

## 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 |


### KORG cortosia

[App page](https://appshunter.io/ios/app/korg-cortosia/id952982019)

**Currently charting:** #190 Top Paid · Music (US App Store)

This app helps musicians improve their sound quality by analyzing five key elements of performance in real-time. It provides instant feedback, tracks daily progress, and allows users to compare their skills globally. Ideal for beginners and intermediate players seeking to refine their technique.

**Highlights:** Real-time analysis of five 'good sound' elements, Instant scoring on a 100-point scale, Daily practice recording and progress tracking, Global ranking for 'good sound' competition, Supports multiple wind and string instruments, Model tone comparison

**In-app purchases:** none


## Frequently asked questions

### Is Transfer Function free?

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

### Is KORG cortosia free?

KORG cortosia costs $9.99, with no in-app purchases.

### Which has better reviews, Transfer Function or KORG cortosia?

KORG cortosia is rated higher. Transfer Function averages 3.0 out of 5 from 2 ratings, while KORG cortosia averages 4.2 from 6 ratings.

### Do Transfer Function or KORG cortosia have ads?

Neither Transfer Function nor KORG cortosia shows ads.

### Which is updated more often, Transfer Function or KORG cortosia?

Transfer Function ships an update every 6 months, and KORG cortosia every 2 months. Most recently, Transfer Function was updated on September 24, 2026 and KORG cortosia on September 23, 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.*