# Implen NanoPhotometer vs Audio Spectrum Viewer

The clearest difference is price: Implen NanoPhotometer at Free against Audio Spectrum Viewer's $0.99. Implen NanoPhotometer also leads on update cadence (every 3 months vs every 72 months) and iOS requirement (10.0 vs 16.6). On ads, in-app purchases and device support there is nothing between them.

Implen NanoPhotometer is free to download; Audio Spectrum Viewer costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Implen NanoPhotometer ships an update every 3 months, Audio Spectrum Viewer every 72 months. The most recent releases landed on October 9, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Implen NanoPhotometer | Audio Spectrum Viewer |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | — | **[4.3 (4 ratings)](https://appshunter.io/ios/app/audio-spectrum-viewer/id1525023447/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 72 months |
| Monetization | — | Paid |
| Size | 54 MB | 2 MB |
| Requires iOS | **10.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Implen Inc.](https://appshunter.io/developer/988716674) | [Steve Glenner](https://appshunter.io/developer/1518671062) |

## What reviewers say

### Implen NanoPhotometer

[App page](https://appshunter.io/ios/app/implen-nanophotometer/id988716675)

**Features:** macOS Compatibility

**In-app purchases:** none


### Audio Spectrum Viewer

[App page](https://appshunter.io/ios/app/audio-spectrum-viewer/id1525023447)

Visualize the frequency content of your live audio environment with a dynamic waterfall spectrogram. Analyze sound systems, create audio fingerprints of environmental sounds, and save spectrograms with custom captions. Capture audio in the background for simultaneous recording and photography.

**Highlights:** Live audio frequency visualization, Waterfall/spectrogram display, Speaker and sound system analysis, Environmental sound fingerprinting, User-selectable gain and sample rate, Save spectrograms with captions, Save audio clips for playback

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

**In-app purchases:** none


## Frequently asked questions

### Is Implen NanoPhotometer free?

Implen NanoPhotometer is free to download, with no in-app purchases.

### Is Audio Spectrum Viewer free?

Audio Spectrum Viewer costs $0.99, with no in-app purchases.

### Do Implen NanoPhotometer or Audio Spectrum Viewer have ads?

Neither Implen NanoPhotometer nor Audio Spectrum Viewer shows ads.

### Which is updated more often, Implen NanoPhotometer or Audio Spectrum Viewer?

Implen NanoPhotometer ships an update every 3 months, and Audio Spectrum Viewer every 72 months. Most recently, Implen NanoPhotometer was updated on October 9, 2026 and Audio Spectrum Viewer on October 24, 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.*