# Harmonic Wave Equation Calc vs DigiDecoder

The clearest difference is price: DigiDecoder at Free against Harmonic Wave Equation Calc's $2.99. DigiDecoder also leads on update cadence (every 4 days vs every 31 months) and ratings volume (8 vs 1). Harmonic Wave Equation Calc's advantage is rating (5.0 vs 4.5) and in-app purchases (none vs 3). On ads and device support there is nothing between them.

DigiDecoder is free to download; Harmonic Wave Equation Calc costs $2.99 up front. DigiDecoder sells 3 in-app purchases, starting at $2.99 per month. Harmonic Wave Equation Calc asks for nothing beyond the download.

Harmonic Wave Equation Calc holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: DigiDecoder has 8 ratings behind it against 1, so its average is the more settled of the two.

Harmonic Wave Equation Calc ships an update every 31 months, DigiDecoder every 4 days. The most recent releases landed on October 10, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Harmonic Wave Equation Calc | DigiDecoder |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/harmonic-wave-equation-calc/id1412323951/reviews)** | [4.5 (8 ratings)](https://appshunter.io/ios/app/digidecoder-ham-radio/id6759073503/reviews) |
| Number of ratings | 1 | **8** |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 31 months | **Every 4 days** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 1 MB | 12 MB |
| Requires iOS | **13** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Nitrio](https://appshunter.io/developer/321121189) | [Lukasz Skierkowski](https://appshunter.io/developer/1280847319) |

## 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


### DigiDecoder

[App page](https://appshunter.io/ios/app/digidecoder-ham-radio/id6759073503)

This application decodes and encodes various ham radio digital modes in real-time. It automatically recognizes signals, displays them with an animated waterfall, and supports sending SSTV images, CW, FT8, and Packet messages.

**Highlights:** Real-time digital mode decoding, Automatic signal recognition, Animated waterfall display, SSTV image encoding, CW, FT8, and Packet message encoding, Bluetooth and network TNC support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| DigiDecoder Monthly | $2.99 | per month |
| DigiDecoder Trial | Free | one-time |
| DigiDecoder Lifetime | $8.99 | one-time |


## Frequently asked questions

### Is Harmonic Wave Equation Calc free?

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

### Is DigiDecoder free?

DigiDecoder is free to download, with in-app purchases available.

### Which has better reviews, Harmonic Wave Equation Calc or DigiDecoder?

Harmonic Wave Equation Calc is rated higher. Harmonic Wave Equation Calc averages 5.0 out of 5 from 1 ratings, while DigiDecoder averages 4.5 from 8 ratings.

### Do Harmonic Wave Equation Calc or DigiDecoder have ads?

Neither Harmonic Wave Equation Calc nor DigiDecoder shows ads.

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

Harmonic Wave Equation Calc ships an update every 31 months, and DigiDecoder every 4 days. Most recently, Harmonic Wave Equation Calc was updated on October 10, 2026 and DigiDecoder on October 15, 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.*