# Harmonic Wave Equation Calc vs Shielding Tester

The clearest difference is price: Shielding Tester at Free against Harmonic Wave Equation Calc's $2.99. Shielding Tester also leads on update cadence (every 7 months vs every 31 months). Harmonic Wave Equation Calc's advantage is iOS requirement (13 vs 15.6). On ads, in-app purchases and device support there is nothing between them.

Shielding Tester is free to download; Harmonic Wave Equation Calc costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Harmonic Wave Equation Calc ships an update every 31 months, Shielding Tester every 7 months. The most recent releases landed on November 2, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | Harmonic Wave Equation Calc | Shielding Tester |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/harmonic-wave-equation-calc/id1412323951/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 31 months | **Every 7 months** |
| Monetization | Paid | — |
| Size | 1 MB | 13 MB |
| Requires iOS | **13** | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Nitrio](https://appshunter.io/developer/321121189) | [Velter KZ](https://appshunter.io/developer/1781938634) |

## 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, Vision Pro support

**In-app purchases:** none


### Shielding Tester

[App page](https://appshunter.io/ios/app/shielding-tester/id6444835317)

**Features:** 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 Shielding Tester free?

Shielding Tester is free to download, with no in-app purchases.

### Do Harmonic Wave Equation Calc or Shielding Tester have ads?

Neither Harmonic Wave Equation Calc nor Shielding Tester shows ads.

### Which is updated more often, Harmonic Wave Equation Calc or Shielding Tester?

Harmonic Wave Equation Calc ships an update every 31 months, and Shielding Tester every 7 months. Most recently, Harmonic Wave Equation Calc was updated on November 2, 2026 and Shielding Tester on November 7, 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.*