Comparison

MIDI Expression Control vs KeyStage

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

MIDI Expression Control

This application allows users to modify settings for MIDI Expression devices. Ensure your device has firmware version 2.6 or higher for iOS compatibility.

Highlights
  • Change device settings
  • Compatible with MIDI Expression devices
  • iOS firmware compatibility check
  • Free to download
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This is the Control Application for MIDI Expression devices. It lets you change settings for the devices. Please note that the iOS version of the Control Application is only compatible with devices running firmware version 2.6 and up.

About

KeyStage

This app acts as a master controller, AUv3 host, and audio mixer for keyboard players. It allows simultaneous control of multiple hardware and software instruments via MIDI, with advanced mapping, scripting, and audio mixing capabilities.

Highlights
  • Connect multiple MIDI controllers to instruments
  • Load AUv3 instruments, effects, and MIDI processors
  • Create complex keyboard splits and layers
  • Advanced MIDI mapping and scripting
  • Audio mixer with volume and pan control
  • Play and automate audio files
  • View PDF and JPG files
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TRY THE FREE LITE VERSION: https://apps.apple.com/us/app/keystage-lite/id1437899019 KeyStage is a master controller, AUv3 host, and audio mixer app designed mainly for keyboard players. With KeyStage, you can simultaneously control any number of hardware and software instruments using any number of MIDI controllers in an organized way. Each project consists of sections (which corresponds to sections of a song). In each section you can change sounds and sound parameters of connected instruments, create complex splits and layers of your keyboard(s), change the functionalities of sliders/knobs/pedals of your MIDI controllers by creating advanced MIDI mappings, write your own scripts, view PDF and JPG files (e.g. sheet music) and lyrics, and much more. LIST OF FEATURES • Connect any number of MIDI controller to any number of MIDI instruments by creating tracks. • Load AUv3 instruments, effects, and MIDI Processors. • Assign any region of your keyboard(s) to any connected instrument. • Change velocity curve and velocity limits, and create velocity splits and layers. • Transpose notes and restrict notes to any key using pitch shifter. • Create mixer units to combine audio signals, turning KeyStage into an audio mixer. • With the player units, you can play wav, mp3, and m4a files, add marker points, automate actions (like play, stop, move to a marker etc.) using custom translators, or trigger certain events (like changing sections) when the player reaches a certain marker. • Input units allows you to use the microphone input, or the hardware inputs of a connected audio interface. • The Main Mixer view allows you to control volume levels and pans of all tracks, connect effect units, and connect units to mixer units. • Create instrument presets to easily change sounds of instruments by choosing patch names from patch lists. • KeyStage can also import Cubase Patch Scripts to automatically create instrument presets for your MIDI instruments. • KeyStage automatically detects new MIDI connections and recommends matching instrument presets from a database. • Simulate auto-sustain on any connected instrument. • KeyStage has a multi-track recorder, which lets you record any number of tracks simultaneously. • Change or filter any MIDI signal using custom translators. Use “Relative Control” switch to smoothly change the parameters of your instruments without any jumps. • Use XY control unit to send control change and pitch bend messages to any connected MIDI instrument. • Create setlists, quick access all the songs in a setlist from a setlist bar, move to previous/next songs from live console or using external MIDI. • Create virtual MIDI inputs/outputs for KeyStage. • Use virtual MIDI piano controller to play connected instruments. • View PDF and JPG files. Link any page or region of any file to any section. • Backup and restore your songs and global properties to Dropbox. • Map special actions (like changing octaves, switching sections, changing pages of a PDF file) to notes and controllers using custom translators. • You can write your own scripts in custom translators, which opens up endless possibilities. • Use MPE routing to control any MIDI instrument using MPE controllers like Seaboard. Use custom translators to change the functionalities of each MPE dimension. • KeyStage supports smooth transitions between sections. Pressed notes will continue to sound when you switch sections. You can access demo videos and video tutorials on my Youtube channel.

Screenshots

MIDI Expression Control4 screens

Verdict

The call

The clearest difference is price: MIDI Expression Control at Free against KeyStage's $29.99. MIDI Expression Control also leads on in-app purchases (none vs 7) and rating (5.0 vs 4.7). KeyStage's advantage is update cadence (every 3 months vs every 6 months) and ratings volume (37 vs 6). On ads and iOS requirement 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

MIDI Expression Control is free to download; KeyStage costs $29.99 up front. KeyStage sells 7 one-off in-app purchases. MIDI Expression Control asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

MIDI Expression Control holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: KeyStage has 37 ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 100% of MIDI Expression Control's written reviews are positive against 91% of KeyStage's.

UpkeepUpdate frequency

MIDI Expression Control ships an update every 6 months, KeyStage every 3 months. The most recent releases landed on June 1, 2026 and September 18, 2026 respectively.

Scorecard8 real differences · 2 level
MIDI Expression Control versus KeyStage: the parameters behind the verdict, then further details
ParameterMIDI Expression ControlKeyStage
PriceFree — better$29.99
Rating5.0 (6 ratings) — better4.7 (37 ratings)
Positive reviews100.0% of reviews — better91.0% of reviews
Number of ratings637 — better
Update frequencyEvery 6 monthsEvery 3 months — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPad
Requires iOS12.0 — better13.0
Further details — not scored
Size6 MB61 MB
Age rating4+4+
DeveloperRobert JonkmanAli Gokturk

Customer experience

MIDI Expression Control

All ratings6 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

KeyStage

All ratings37 ratings
Positive91.9%
Neutral2.7%
Negative5.4%
Written reviews67 reviews
Positive91.0%
Neutral3.0%
Negative6.0%

In-app purchases

None

MIDI Expression Control

No in-app purchases

7 purchases

KeyStage

One-time7
  • Instrument UnitsFree
  • Effect UnitsFree
  • Player, Input, and Mixer UnitsFree
Show 4 more
  • MIDI UnitsFree
  • Small Tip$0.99
  • Medium Tip$3.99
  • Large Tip$9.99

Questions

Is MIDI Expression Control free?
MIDI Expression Control is free to download, with no in-app purchases.
Is KeyStage free?
KeyStage costs $29.99, and also offers in-app purchases.
Which has better reviews, MIDI Expression Control or KeyStage?
MIDI Expression Control is rated higher. MIDI Expression Control averages 5.0 out of 5 from 6 ratings, while KeyStage averages 4.7 from 37 ratings.
Do MIDI Expression Control or KeyStage have ads?
Neither MIDI Expression Control nor KeyStage shows ads.
Which is updated more often, MIDI Expression Control or KeyStage?
MIDI Expression Control ships an update every 6 months, and KeyStage every 3 months. Most recently, MIDI Expression Control was updated on June 1, 2026 and KeyStage on September 18, 2026.

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