# NDS8120 vs Audio RTA

The clearest difference is in-app purchases: NDS8120 at none against Audio RTA's 1. NDS8120 also leads on iOS requirement (9.0 vs 15.0). Audio RTA's advantage is update cadence (weekly vs every 3 months). On price, ads and device support there is nothing between them.

Both are free to download. Audio RTA sells 1 one-off in-app purchase. NDS8120 asks for nothing beyond the download.

NDS8120 ships an update every 3 months, Audio RTA weekly. The most recent releases landed on October 14, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | NDS8120 | Audio RTA |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/audio-rta-spectrum-analyzer/id6784479397/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Weekly** |
| Monetization | — | Free |
| Size | 39 MB | 36 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Guangzhou Aidan Blessindo Electronic Co.,Ltd.](https://appshunter.io/developer/1413008258) | [Mateus Polonini Cardoso](https://appshunter.io/developer/1530866903) |

## What reviewers say

### NDS8120

[App page](https://appshunter.io/ios/app/nds8120/id1447860792)

**Features:** macOS Compatibility

**In-app purchases:** none


### Audio RTA

[App page](https://appshunter.io/ios/app/audio-rta-spectrum-analyzer/id6784479397)

This application transforms your mobile device into a real-time audio analysis tool. It allows you to monitor sound frequencies, decibel levels, and identify peaks using your device's microphone, aiding in the tuning and testing of various audio systems.

**Highlights:** Real-time RTA/FFT analyzer, dB meter, Frequency generator, Test tones, noise, and sweeps, Subwoofer test tools, Stereo channel tests

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Audio Analyzer RTA Pro | $1.99 | one-time |


## Frequently asked questions

### Is NDS8120 free?

NDS8120 is free to download, with no in-app purchases.

### Is Audio RTA free?

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

### Do NDS8120 or Audio RTA have ads?

Neither NDS8120 nor Audio RTA shows ads.

### Which is updated more often, NDS8120 or Audio RTA?

NDS8120 ships an update every 3 months, and Audio RTA weekly. Most recently, NDS8120 was updated on October 14, 2026 and Audio RTA on October 20, 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.*