# Resonator Audio Unit vs Keys

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.

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.

## The numbers

| Metric | Resonator Audio Unit | Keys |
| --- | --- | --- |
| Price | **$2.99** | $5.99 |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/resonator-audio-unit/id1225597875/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/keys-midi-controller/id1668785508/reviews) |
| Number of ratings | **3** | 1 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 38 months | **Every 10 months** |
| Monetization | Paid | Paid |
| Size | 10 MB | 17 MB |
| Requires iOS | **10** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Aleksandar Mlazev](https://appshunter.io/developer/1093798140) | [LittleCodeShop.com](https://appshunter.io/developer/288684013) |

## What reviewers say

### Resonator Audio Unit

[App page](https://appshunter.io/ios/app/resonator-audio-unit/id1225597875)

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.

**Highlights:** Natural sounding resonances, Acoustic body thickness and size control, Resonance amount control, Additional reverb effect, Standalone app mode with Efx on/off

**Features:** Vision Pro support

**In-app purchases:** none


### Keys

[App page](https://appshunter.io/ios/app/keys-midi-controller/id1668785508)

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.

**Highlights:** Transform device into MIDI master keyboard, Connect to musical devices, Send MIDI notes and CC, Control virtual instruments, MIDI over Bluetooth, Customizable MIDI mapping

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Resonator Audio Unit free?

Resonator Audio Unit costs $2.99, with no in-app purchases.

### Is Keys free?

Keys costs $5.99, with no in-app purchases.

### Which has better reviews, Resonator Audio Unit or Keys?

Resonator Audio Unit is rated higher. Resonator Audio Unit averages 5.0 out of 5 from 3 ratings, while Keys averages 1.0 from 1 ratings.

### Do Resonator Audio Unit or Keys have ads?

Neither Resonator Audio Unit nor Keys shows ads.

### Which is updated more often, Resonator Audio Unit or Keys?

Resonator Audio Unit ships an update every 38 months, and Keys every 10 months. Most recently, Resonator Audio Unit was updated on November 2, 2026 and Keys on November 3, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*