# Harmonic Wave Equation Calc vs KQ MIDI Modulate

The clearest difference is update cadence: KQ MIDI Modulate at fortnightly against Harmonic Wave Equation Calc's every 31 months. KQ MIDI Modulate also leads on ratings volume (4 vs 1). Harmonic Wave Equation Calc's advantage is price ($2.99 vs $5.99) and iOS requirement (13 vs 15.0). On rating, ads, in-app purchases and monetization model there is nothing between them.

Harmonic Wave Equation Calc costs $2.99 and KQ MIDI Modulate $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for Harmonic Wave Equation Calc against 5.0 for KQ MIDI Modulate. Both are backed by a comparable volume of ratings — 1 and 4 respectively.

Harmonic Wave Equation Calc ships an update every 31 months, KQ MIDI Modulate fortnightly. The most recent releases landed on July 6, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | Harmonic Wave Equation Calc | KQ MIDI Modulate |
| --- | --- | --- |
| Price | **$2.99** | $5.99 |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/harmonic-wave-equation-calc/id1412323951/reviews) | [5.0 (4 ratings)](https://appshunter.io/ios/app/kq-midi-modulate/id6479354516/reviews) |
| Number of ratings | 1 | **4** |
| Positive reviews | — | 66.7% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 31 months | **Fortnightly** |
| Monetization | Paid | Paid |
| Size | 1 MB | 2 MB |
| Requires iOS | **13** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Tan Chia Ling](https://appshunter.io/developer/321121189) | [Ryouta Kira](https://appshunter.io/developer/862984358) |

## What reviewers say

### Harmonic Wave Equation Calc

[App page](https://appshunter.io/ios/app/harmonic-wave-equation-calc/id1412323951)

This physics and math calculator quickly determines wave properties like displacement, velocity, and amplitude. It provides instant calculations with copyable results and includes reference formulas. Optimized for everyday use, it supports high precision and various units.

**Highlights:** Instant wave calculations, Copyable results, Included reference formulas, Supports 16 decimal places, Multiple unit support, Ad-free and private

**Features:** macOS Compatibility

**In-app purchases:** none


### KQ MIDI Modulate

[App page](https://appshunter.io/ios/app/kq-midi-modulate/id6479354516)

This tool is designed for advanced MIDI users to manipulate and route MIDI signals. It offers extensive control over signal conversion, note triggering, and pad-based MIDI output, including AUv3 plugins. It does not produce sound on its own.

**Highlights:** MIDI signal conversion, 8x16 pad output, Free MIDI device routing, AUv3 plugins included, Note and control signal triggering, Customizable signal filtering

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Harmonic Wave Equation Calc free?

Harmonic Wave Equation Calc costs $2.99, with no in-app purchases.

### Is KQ MIDI Modulate free?

KQ MIDI Modulate costs $5.99, with no in-app purchases.

### Which has better reviews, Harmonic Wave Equation Calc or KQ MIDI Modulate?

Harmonic Wave Equation Calc and KQ MIDI Modulate are both rated 5.0 out of 5 on the App Store, from 1 and 4 ratings respectively.

### Do Harmonic Wave Equation Calc or KQ MIDI Modulate have ads?

Neither Harmonic Wave Equation Calc nor KQ MIDI Modulate shows ads.

### Which is updated more often, Harmonic Wave Equation Calc or KQ MIDI Modulate?

Harmonic Wave Equation Calc ships an update every 31 months, and KQ MIDI Modulate fortnightly. Most recently, Harmonic Wave Equation Calc was updated on July 6, 2026 and KQ MIDI Modulate on September 19, 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.*