Resonator Audio Unit vs Keys
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Resonator Audio Unit
This audio effect plugin generates natural resonances to add warmth and fullness to instruments or recordings. It offers controls for acoustic body characteristics and includes an additional reverb effect for standalone use. The app utilizes unique, realistic algorithms for its sound shaping capabilities.
- Natural sounding resonances
- Acoustic body thickness and size control
- Resonance amount control
- Additional reverb effect
- Standalone app mode with Efx on/off
Read full descriptionHide full description
Resonator Audio Unit is an audio effect that creates natural sounding resonances in an acoustic body. That will add warmth and fullness to the tone of any instrument or to your record. You can control the acoustic body thickness, size and the amount of resonances. There is also additional reverb effect so you can add reflections to the sound of the resonator. This is useful if you use the app as a standalone to get your whole sound and play on your instrument via iRig or similar adapter. The app uses realistic and innovative algorithms created by me that you can not find in other software. Features of the Resonator Audio Unit: - warm and natural sounding resonances - acoustic body controls for thickness and size - resonances amount control - additional reverb effect - Efx on/off button (available when used as a stand alone app)
Keys
Turn your mobile device into a versatile MIDI master keyboard. Connect wirelessly to musical instruments and DAWs to control virtual instruments and enhance your music production and live performances.
- Transform device into MIDI master keyboard
- Connect to musical devices
- Send MIDI notes and CC
- Control virtual instruments
- MIDI over Bluetooth
- Customizable MIDI mapping
Read full descriptionHide full description
Transform your iPad or iPhone into a powerful Midi Master Keyboard with our app! Our app allows you to connect to any musical device and send Midi notes and Midi CC, making your mobile device a versatile tool for music production and live performance. Whether you're a professional musician or just starting out, our app offers a simple and intuitive interface to help you create, control, and perform music. With our app, you can easily connect to your digital audio workstation (DAW), synthesizers, and other musical devices to control virtual instruments and bring your musical ideas to life. Our app also supports MIDI over Bluetooth, allowing you to connect wirelessly to your musical devices. Plus, with the ability to customize your Midi mapping, you can personalize your setup to fit your unique needs. Take your music production and performance to the next level with our Midi Master Keyboard app for iPad and iPhone. Download now and experience the power of mobile music making.
Screenshots
Verdict
The clearest difference is rating: Resonator Audio Unit at 5.0 against Keys's 1.0. Resonator Audio Unit also leads on price ($2.99 vs $5.99) and ratings volume (3 vs 1). Keys's advantage is update cadence (every 10 months vs every 38 months). On ads, in-app purchases, 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
Resonator Audio Unit costs $2.99 and Keys $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Resonator Audio Unit holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 3 and 1 respectively.
Resonator Audio Unit ships an update every 38 months, Keys every 10 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.
| Parameter | Resonator Audio Unit | Keys |
|---|---|---|
| Price | $2.99 — better | $5.99 |
| Rating | 5.0 (3 ratings) — better | 1.0 (1 ratings) |
| Number of ratings | 3 — better | 1 |
| Update frequency | Every 38 months | Every 10 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 10 — better | 17.0 |
| Further details — not scored | ||
| Size | 10 MB | 17 MB |
| Age rating | 4+ | 4+ |
| Developer | Aleksandar Mlazev | LittleCodeShop.com |
Customer experience
Resonator Audio Unit
Keys
In-app purchases
Resonator Audio Unit
No in-app purchases
Keys
No in-app purchases









