# SpectralScan Audio Analyzer dB vs Unit Converter HVAC

The clearest difference is price: SpectralScan Audio Analyzer dB at Free against Unit Converter HVAC's $0.99. SpectralScan Audio Analyzer dB also leads on update cadence (every 9 days vs every 3 weeks). Unit Converter HVAC's advantage is iOS requirement (13.0 vs 15.0). On ads, in-app purchases and device support there is nothing between them.

SpectralScan Audio Analyzer dB is free to download; Unit Converter HVAC costs $0.99 up front. SpectralScan Audio Analyzer dB sells 1 one-off in-app purchase and Unit Converter HVAC sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

SpectralScan Audio Analyzer dB ships an update every 9 days, Unit Converter HVAC every 3 weeks. The most recent releases landed on November 9, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | SpectralScan Audio Analyzer dB | Unit Converter HVAC |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[4.9 (20 ratings)](https://appshunter.io/ios/app/spectralscan-audio-analyzer-db/id6762024331/reviews)** | — |
| Number of ratings | **20** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 3 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 16 MB | 34 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Otsukare AB](https://appshunter.io/developer/1892516192) | [Rizvan Adzhoian](https://appshunter.io/developer/1891746079) |

## What reviewers say

### SpectralScan Audio Analyzer dB

[App page](https://appshunter.io/ios/app/spectralscan-audio-analyzer-db/id6762024331)

Transform your device into a professional audio analysis tool. Visualize sound in real-time with a high-resolution spectrum, perform precise sine sweep measurements, and analyze frequency content over time. Save, compare, and export your audio data.

**Highlights:** Real-time frequency spectrum visualization, Sine sweep measurements for system response, Spectrogram for time-frequency analysis, Comparison and overlay of multiple measurements, Export data as CSV or PNG, Pro features for advanced analysis

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SpectralScan Pro | $11.99 | one-time |


### Unit Converter HVAC

[App page](https://appshunter.io/ios/app/unit-converter-hvac/id6764647825)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Unlock | $2.99 | one-time |


## Frequently asked questions

### Is SpectralScan Audio Analyzer dB free?

SpectralScan Audio Analyzer dB is free to download, with in-app purchases available.

### Is Unit Converter HVAC free?

Unit Converter HVAC costs $0.99, and also offers in-app purchases.

### Do SpectralScan Audio Analyzer dB or Unit Converter HVAC have ads?

Neither SpectralScan Audio Analyzer dB nor Unit Converter HVAC shows ads.

### Which is updated more often, SpectralScan Audio Analyzer dB or Unit Converter HVAC?

SpectralScan Audio Analyzer dB ships an update every 9 days, and Unit Converter HVAC every 3 weeks. Most recently, SpectralScan Audio Analyzer dB was updated on November 9, 2026 and Unit Converter HVAC on October 28, 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.*