Harmony Voice vs KeyStage Lite
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Harmony Voice
Create a vocal choir from your own voice with up to four harmonized parts. This app offers real-time pitch correction, automatic chord generation, and voice character modification. Enhance your singing with professional effects and easily record and export your creations.
- Four-part real-time harmonizer
- Automatic tuning correction
- Manual and automatic harmonization modes
- Voice character adjustment
- Hi-end reverb and chorus effects
- Audio recorder with metronome
- SoundCloud upload and file export
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Transform your voice into a choir with up to four voices ! Harmony Voice is a pitch shifter and harmonizer with professional features including automatic tuning correction. A realtime visual intonation-display gives you feedback of the tunes you sing. You can sing and Harmony voice will add up to four voices according to the chords you play with the piano keyboard. Instead of playing the chords yourself you can let Harmony Voice play the chords automatically to enrich the sound of your voice in a musically pleasant way. The voice character can be adjusted in a way that you can turn a female voice into a male voice and the other way round. Features: • Four part realtime Harmonizer / Pitch corrector • Different Harmonizer modes: - Manual harmonization by playing chords with up to four notes while singing - Automatic harmonization ( Kraehenbuehl ) - Play base note and Harmony Voice adds appropriate chords - Directly play the tunes for up to four voices with the keyboard. • Select key note and scale for harmonization and pitch correction. • Harmonies can be in just ( Barbershop ) or tempered tuning. • Mix your original voice with the harmonized parts. • Change the voice character. • Play background track from your iTunes library. • Hi-end reverb effect for room simulation. • Chorus and Delay effect. • Audiobus 2 support (Input/Filter/Output) (requires iOS 7 or newer) • Use a CoreMIDI compatible Interface to control Harmony Voice with a MIDI Keyboard. • Audio recorder with Metronome. • Upload to SoundCloud and File Export. • Audio pasteboard for exporting to other Apps Headphones are required to avoid feedback. Headsets with mic work great, for best quality we recommend IK Multimedia's iRig Mic.
KeyStage Lite
This app acts as a master controller and audio mixer for keyboard players. It allows simultaneous control of multiple hardware and software instruments using various MIDI controllers. Organize songs into sections, customize instrument sounds, and manage MIDI mappings with advanced scripting capabilities.
- Control multiple MIDI controllers and instruments
- Host AUv3 instruments and effects
- Create complex keyboard splits and layers
- Advanced MIDI mapping and scripting
- Audio mixer with track control
- Play and manage audio files
- View PDF and JPG files
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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
Verdict
The clearest difference is price: KeyStage Lite at Free against Harmony Voice's $4.99. KeyStage Lite also leads on rating (4.0 vs 2.3) and review sentiment (60% vs 33%). Harmony Voice's advantage is device support (3 vs 1) and ratings volume (24 vs 7). On update cadence, ads and in-app purchases 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
KeyStage Lite is free to download; Harmony Voice costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.
KeyStage Lite holds the better App Store score, 4.0 against 2.3. Both are backed by a comparable volume of ratings — 24 and 7 respectively. Written reviews point the same way: 33% of Harmony Voice's written reviews are positive against 60% of KeyStage Lite's.
Harmony Voice ships an update every 6 months, KeyStage Lite every 3 months. The most recent releases landed on October 17, 2026 and October 7, 2026 respectively.
| Parameter | Harmony Voice | KeyStage Lite |
|---|---|---|
| Price | $4.99 | Free — better |
| Rating | 2.3 (24 ratings) | 4.0 (7 ratings) — better |
| Positive reviews | 33.3% of reviews | 60.0% of reviews — better |
| Number of ratings | 24 — better | 7 |
| Update frequency | Every 6 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod — better | iPad |
| Requires iOS | 8.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 28 MB | 61 MB |
| Age rating | 4+ | 4+ |
| Developer | Harry Gohs | Ali Gokturk |
Customer experience
Harmony Voice
KeyStage Lite
In-app purchases
Harmony Voice
No in-app purchases
KeyStage Lite
No in-app purchases









