Comparison

Transfer Function vs KORG cortosia

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

KORG cortosia

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
Currently charting
Read full description

KORG cortosia, the tuner app that makes it enjoyable to practice the basics Learn “good sound” and enjoy “good performance”! *This app can evaluate only flute, clarinet, trumpet, violin, cello, saxophone, trombone and euphonium performances. (Operating Requirements) iOS8 or later iPhone 5 or later, iPod Touch 5th Generation or later KORG has answered the question: “Can a tuner recognize good sound?” With the KORG cortosia you'll see what's missing from “good sound” with just a glance. Even practice that's slightly boring (such as practicing the production of single notes) will become enjoyable. The cortosia is a completely new type of interactive tuner app designed to improve the overall quality of sound produced by the artist. * Analyzes five elements of “good sound” and rates them in real time * Automatically records “good sound” so you can check your daily improvement in technique * Lets you compete against the world in “good sound” and vie for ranking * Supports flute, clarinet, trumpet, violin, cello, saxophone, trombone and euphonium Analyze five elements of “good sound” and rate them in real time: Just what is “good sound”? Beautiful sound, pleasant sound, sound that resonates in the listener's heart. Perceptions of “good sound” differ between people, but could there be some commonalities? Through cooperative research with Pompeu Fabra University in Barcelona, Spain, under the direction of Professor Xavier Serra, Korg has arrived at a technology “Artistry” (*1) for evaluating “good sound” based on five elements. 1: Pitch Stability 2: Dynamic Stability 3: Timbre Stability 4: Timbre Richness 5: Attack Clarity Simultaneously with the tuner display, a radar chart shows the results of analyzing these five elements in real time, and scores them on a scale of 100 points. While tuning, you can see at a glance what aspects of your tone are lacking. You can also listen to a model tone and hear how it differs from your own sound. This is highly recommended for beginners who have just started a musical instrument, as well as for intermediate players who want to advance to the next level. *1: Automatic Rating Technology for musical InSTRument plaYers Automatically record “good sound,” and check your daily advances in technique: Data is automatically recorded and kept when tuning and scoring. You can audition the accumulated recording data or recall a radar chart for it, and you can also check the number of hours you practiced and your best score for each day. By looking at your past results, you can see how you are progressing. In addition, you can post your score to a social networking service such as Facebook or Twitter allowing you to record or upload your daily progress (or backsliding) as if you were writing a diary. Whether you use this to compete with your friends or to give encouraging comments, it's a great way to improve your skill while enjoyably sharing information. Compete with the world for “good sound”: Your ranking is compiled by averaging your highest score for each note, and displayed. You'll be able to see your current position among performers around the world who use cortosia. Supports flute, clarinet, trumpet, violin, cello, saxophone, trombone and euphonium. A full range of basic functionality including tuner, metronome, and level meter: In addition to a chromatic tuner that benefits from Korg's forty years of know-how in tuner development, there's a metronome that supports tap tempo, and even a level meter, making cortosia a great partner for performance or practice.

Screenshots

Transfer Function3 screens
KORG cortosia4 screens

Verdict

The call

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.

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

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard8 real differences · 3 level
Transfer Function versus KORG cortosia: the parameters behind the verdict, then further details
ParameterTransfer FunctionKORG cortosia
Price$49.99$9.99 — better
Rating3.0 (2 ratings)4.2 (6 ratings) — better
Positive reviews25.0% of reviews47.8% of reviews — better
Number of ratings26 — better
Update frequencyEvery 6 monthsEvery 2 months — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationPaidPaid
Best chart rank—#190 — better
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.012.0 — better
Further details — not scored
Size33 MB35 MB
Age rating4+12+
DeveloperAndrew SmithKORG INC.

Customer experience

Transfer Function

All ratings2 ratings
Positive50.0%
Neutral0.0%
Negative50.0%
Written reviews4 reviews
Positive25.0%
Neutral0.0%
Negative75.0%

KORG cortosia

All ratings6 ratings
Positive66.7%
Neutral16.7%
Negative16.7%
Written reviews23 reviews
Positive47.8%
Neutral26.1%
Negative26.1%

In-app purchases

1 purchases

Transfer Function

One-time1
  • Reference Curves Option$14.99
None

KORG cortosia

No in-app purchases

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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