# Valiance Backbone for CW vs Sound Level & Spectrogram

The clearest difference is price: Sound Level & Spectrogram at Free against Valiance Backbone for CW's $3.99. Sound Level & Spectrogram also leads on in-app purchases (none vs 4) and review sentiment (100% vs 73%). Valiance Backbone for CW's advantage is ads (none vs shown) and device support (3 vs 1).

Sound Level & Spectrogram is free to download; Valiance Backbone for CW costs $3.99 up front. Valiance Backbone for CW sells 4 one-off in-app purchases. Sound Level & Spectrogram asks for nothing beyond the download.

Valiance Backbone for CW ships an update every 11 months, Sound Level & Spectrogram every 5 months. The most recent releases landed on October 29, 2026 and October 23, 2026 respectively.

## The numbers

| Metric | Valiance Backbone for CW | Sound Level & Spectrogram |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | **[2.0 (1 ratings)](https://appshunter.io/ios/app/valiance-backbone-for-cw-vbc/id521096092/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 72.7% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 11 months | **Every 5 months** |
| Monetization | Paid | **Ad-supported** |
| Size | 28 MB | 4 MB |
| Requires iOS | **11.0** | 18.7 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Nob](https://appshunter.io/developer/508077821) | [TOON,LLC](https://appshunter.io/developer/633948723) |

## What reviewers say

### Valiance Backbone for CW

[App page](https://appshunter.io/ios/app/valiance-backbone-for-cw-vbc/id521096092)

Decode Morse code signals in real-time using your device's microphone. This app employs advanced FFT technology to accurately distinguish transceiver signals from noise, offering a high success rate for radio communications. It features a range of tools for signal analysis and log management.

**Highlights:** Real-time Morse code decoding via microphone, Advanced FFT technology for signal detection, Minimizes false decodes from noise, Morse Sound Recorder & Player, Export text logs and audio data, Predictive decoding for difficult codes, Tone and sound pressure measurement

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Tip for the Developer | $0.99 | one-time |
| Standard Support | $4.99 | one-time |
| Premium | $9.99 | one-time |
| Ultimate Supporter | $29.99 | one-time |


### Sound Level & Spectrogram

[App page](https://appshunter.io/ios/app/sound-level-and-spectrogram/id6503722682)

Measure sound levels in decibels and visualize sound frequencies with a real-time spectrogram. Understand your environment's noise and protect your health. Offers advanced settings for accurate acoustic analysis.

**Highlights:** Sound level measurement (dB), Real-time spectrogram analysis, Frequency weighting correction (A, C, Z), Time weighting characteristics (Fast, Slow), Time course graph, Environmental noise measurement

**In-app purchases:** none


## Frequently asked questions

### Is Valiance Backbone for CW free?

Valiance Backbone for CW costs $3.99, and also offers in-app purchases.

### Is Sound Level & Spectrogram free?

Sound Level & Spectrogram is free to download, with no in-app purchases.

### Do Valiance Backbone for CW or Sound Level & Spectrogram have ads?

Sound Level & Spectrogram shows ads; Valiance Backbone for CW does not.

### Which is updated more often, Valiance Backbone for CW or Sound Level & Spectrogram?

Valiance Backbone for CW ships an update every 11 months, and Sound Level & Spectrogram every 5 months. Most recently, Valiance Backbone for CW was updated on October 29, 2026 and Sound Level & Spectrogram on October 23, 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.*