Harmony Eight vs mKer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Harmony Eight
Create up to eight distinct pitch-shifted voices from your audio input. Position each voice in stereo space, alter their character from male to female, and apply individual feedback delays for intricate rhythms. Offers advanced audio processing including EQ, compression, and reverb.
- 8-voice pitch shifting with formant correction
- Independent delay lines with sync
- Spatial voice positioning
- Vocal character modification
- Parametric EQ, Compressor, Limiter, Noise Gate
- Ensemble and Reverb effects
- AUv3, Inter-app audio, Audiobus support
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Up to eight pitch shifted voices are created from vocal input or instruments. Separate algorithms for optimal shifting of vocals/monophonic instruments and for any other kind of audio. Position each voice in space ( left and right / front and back ) Modify the voice character from male to female and vice versa. Pitch shift each voice in the range of +/- one octave with preserving of formants for natural sound. Applying separate feedback delays on each voice creates complex rhythmical patterns. Features: • 8 Voice Pitch Shifter with formant correction • Optional shifting algorithm for polyphonic sounds • 8 Independent delay lines with optional sync • Spatial voice positioning • Parametric Equalizer • Integrated Compressor/Limiter/Noise Gate • Ensemble effect • Reverb effect • AudioUnit for AUv3 compatible hosts. • Inter-app audio compatible effect. • Audiobus 2 compatible with state saving. • Support for Ableton Link • Low latency live usage with mic and headphones. • Audio recorder
mKer
A versatile MIDI step sequencer designed for music creation. It offers multiple outputs, extensive pattern and lane customization, and advanced step editing. Best used within an AUv3 host app for sound generation.
- 8 MIDI outputs
- 64 Patterns with 16 Lanes each
- Customizable Steps and Step Size per Lane
- Advanced Step Parameters (Pitch, Velocity, Probability, etc.)
- Flexible Editor with Step Entry Keyboard
- 32 Clips with Repeat Functionality
- Performance Tab with Assignable Sliders and Morphing
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*** Note *** Although mKer can run as a stand-alone app, the recommended way to use it is as an AUv3 plugin from inside a suitable AU Host app that supports MIDI Processors such as AUM, Audiobus, Cubasis etc. Please also note that mKer is a MIDI app/plugin. That means that it does not produce sound itself - it needs to be connected to an audio source that can receive MIDI. mKer is a versatile, multi-output MIDI step sequencer with an extensive range of features. These include: - 8 MIDI outputs - 64 Patterns - 16 Lanes (aka tracks) per Pattern - Independent number of Steps (1-32) and Step Size (1/64-256 beats) per Lane per Pattern - Every step can play either a single note, an interval (2 notes) or a chord (3 or 4 notes) - Lane Step parameters: Play Cycles, Skip Cycles, Play Offset Cycles, Pitch, Velocity, Probability, Offset (can be used for ‘swing’ like effects), Repeat (rachet) and Gate - A flexible Editor that includes a step entry keyboard, parameter sliders and a variety of options and utilities designed for to make the workflow intuitive and fast - 32 Clips with 1-8 Steps per Clip, 1-128 repeats per step (every clip step has one pattern) - 3 Play Modes: Pattern, Clip, Sequence (all Clips) - A Performance tab with 10 fully assignable MIDI sliders, a 12-snapshot bank and morphing function between the snapshots... - MIDI step input and real-time recording - 12-track beat generator with six genres, density, intensity and GM beat mapping ... and more!
Screenshots
Verdict
The clearest difference is update cadence: Harmony Eight at weekly against mKer's every 3 weeks. Harmony Eight also leads on review sentiment (75% vs 64%) and device support (3 vs 1). mKer's advantage is rating (4.5 vs 4.3). On ratings volume, ads, in-app purchases and monetization model 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
Harmony Eight costs $2.99 and mKer $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.
mKer holds the better App Store score, 4.5 against 4.3. Both are backed by a comparable volume of ratings — 11 and 22 respectively. Written reviews complicate that: 75% of Harmony Eight's written reviews are positive against 64% of mKer's, so the app with the better star average is not the one people write more warmly about.
Harmony Eight ships an update weekly, mKer every 3 weeks. The most recent releases landed on September 11, 2026 and September 18, 2026 respectively.
| Parameter | Harmony Eight | mKer |
|---|---|---|
| Price | $2.99 — better | $3.99 |
| Rating | 4.3 (11 ratings) | 4.5 (22 ratings) — better |
| Positive reviews | 75.0% of reviews — better | 63.6% of reviews |
| Number of ratings | 11 | 22 — better |
| Update frequency | Weekly — better | Every 3 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod — better | iPad |
| Requires iOS | 8.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 17 MB | 57 MB |
| Age rating | 4+ | 4+ |
| Developer | Harry Gohs | Axart Labs OU |
Customer experience
Harmony Eight
mKer
In-app purchases
Harmony Eight
No in-app purchases
mKer
No in-app purchases









