# White Noise Plus vs Harmonic Wave Equation Calc

The clearest difference is price: White Noise Plus at Free against Harmonic Wave Equation Calc's $2.99. White Noise Plus also leads on ratings volume (28 vs 1). Harmonic Wave Equation Calc's advantage is in-app purchases (none vs 1) and iOS requirement (13 vs 18.6). On rating, update cadence, ads and device support there is nothing between them.

White Noise Plus is free to download; Harmonic Wave Equation Calc costs $2.99 up front. White Noise Plus sells 1 one-off in-app purchase. Harmonic Wave Equation Calc asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for White Noise Plus against 5.0 for Harmonic Wave Equation Calc. That said, the two scores are not equally well evidenced: White Noise Plus has 28 ratings behind it against 1, so its average is the more settled of the two.

White Noise Plus ships an update every 15 months, Harmonic Wave Equation Calc every 31 months. The most recent releases landed on November 3, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | White Noise Plus | Harmonic Wave Equation Calc |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | [5.0 (28 ratings)](https://appshunter.io/ios/app/white-noise-plus/id1281372285/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/harmonic-wave-equation-calc/id1412323951/reviews)** |
| Number of ratings | **28** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 15 months** | Every 31 months |
| Monetization | **Free** | Paid |
| Size | 12 MB | 1 MB |
| Requires iOS | 18.6 | **13** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [David Albers](https://appshunter.io/developer/1281372284) | [Nitrio](https://appshunter.io/developer/321121189) |

## What reviewers say

### White Noise Plus

[App page](https://appshunter.io/ios/app/white-noise-plus/id1281372285)

This utility app provides a variety of ambient sounds like white, brown, and pink noise to aid relaxation and sleep. It includes customizable features such as a sleep timer, volume fading, and theme options. Integration with Siri Shortcuts and widgets enhances user convenience.

**Highlights:** White, brown, and pink noise generation, Sleep timer, Wavy and fading volume control, Dark/light theme options, Siri Shortcuts support, Widget integration

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $3.00 | one-time |


### 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, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is White Noise Plus free?

White Noise Plus is free to download, with in-app purchases available.

### Is Harmonic Wave Equation Calc free?

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

### Which has better reviews, White Noise Plus or Harmonic Wave Equation Calc?

Harmonic Wave Equation Calc is rated higher. White Noise Plus averages 5.0 out of 5 from 28 ratings, while Harmonic Wave Equation Calc averages 5.0 from 1 ratings.

### Do White Noise Plus or Harmonic Wave Equation Calc have ads?

Neither White Noise Plus nor Harmonic Wave Equation Calc shows ads.

### Which is updated more often, White Noise Plus or Harmonic Wave Equation Calc?

White Noise Plus ships an update every 15 months, and Harmonic Wave Equation Calc every 31 months. Most recently, White Noise Plus was updated on November 3, 2026 and Harmonic Wave Equation Calc on November 2, 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.*