# Harmonic Exciter AUv3 Plugin vs Keys

The clearest difference is rating: Harmonic Exciter AUv3 Plugin at 3.4 against Keys's 1.0. Harmonic Exciter AUv3 Plugin also leads on update cadence (every 9 days vs every 10 months) and ratings volume (8 vs 1). Keys's advantage is price ($5.99 vs $8.99). On ads, in-app purchases, monetization model and device support there is nothing between them.

Harmonic Exciter AUv3 Plugin costs $8.99 and Keys $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Harmonic Exciter AUv3 Plugin holds the better App Store score, 3.4 against 1.0. That said, the two scores are not equally well evidenced: Harmonic Exciter AUv3 Plugin has 8 ratings behind it against 1, so its average is the more settled of the two.

Harmonic Exciter AUv3 Plugin ships an update every 9 days, Keys every 10 months. The most recent releases landed on November 12, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Harmonic Exciter AUv3 Plugin | Keys |
| --- | --- | --- |
| Price | $8.99 | **$5.99** |
| Rating | **[3.4 (8 ratings)](https://appshunter.io/ios/app/harmonic-exciter-auv3-plugin/id1458704222/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/keys-midi-controller/id1668785508/reviews) |
| Number of ratings | **8** | 1 |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 10 months |
| Monetization | Paid | Paid |
| Size | 9 MB | 17 MB |
| Requires iOS | **9.3** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [4Pockets.com](https://appshunter.io/developer/370131860) | [LittleCodeShop.com](https://appshunter.io/developer/288684013) |

## What reviewers say

### Harmonic Exciter AUv3 Plugin

[App page](https://appshunter.io/ios/app/harmonic-exciter-auv3-plugin/id1458704222)

Enhance your audio mixes by adding clarity and edge to sounds. This plugin synthesizes additional harmonics to make instruments cut through, simulate saturation, and achieve a more pleasing tonal content than traditional EQ.

**Highlights:** Adds clarity and edge to audio, Synthesizes additional harmonics, Simulates valve/transistor saturation, Visualizes incoming audio spectrum, Adjustable harmonic sliders, Phase manipulation

**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 Harmonic Exciter AUv3 Plugin free?

Harmonic Exciter AUv3 Plugin costs $8.99, with no in-app purchases.

### Is Keys free?

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

### Which has better reviews, Harmonic Exciter AUv3 Plugin or Keys?

Harmonic Exciter AUv3 Plugin is rated higher. Harmonic Exciter AUv3 Plugin averages 3.4 out of 5 from 8 ratings, while Keys averages 1.0 from 1 ratings.

### Do Harmonic Exciter AUv3 Plugin or Keys have ads?

Neither Harmonic Exciter AUv3 Plugin nor Keys shows ads.

### Which is updated more often, Harmonic Exciter AUv3 Plugin or Keys?

Harmonic Exciter AUv3 Plugin ships an update every 9 days, and Keys every 10 months. Most recently, Harmonic Exciter AUv3 Plugin was updated on November 12, 2026 and Keys on November 3, 2026.

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