# RTA Pro vs K

The clearest difference is price: K at Free against RTA Pro's $5.99. K also leads on update cadence (every 3 weeks vs every 3 months) and iOS requirement (8.0 vs 17.6). On ads, in-app purchases and device support there is nothing between them.

K is free to download; RTA Pro costs $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

RTA Pro ships an update every 3 months, K every 3 weeks. The most recent releases landed on November 1, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | RTA Pro | K |
| --- | --- | --- |
| Price | $5.99 | **Free** |
| Rating | **[4.5 (2 ratings)](https://appshunter.io/ios/app/rta-pro/id703753970/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Monetization | Paid | — |
| Size | 12 MB | 10 MB |
| Requires iOS | 17.6 | **8.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Matthias Schorer](https://appshunter.io/developer/290579382) | [HMAUDIO Technology Co.,Ltd](https://appshunter.io/developer/1257360532) |

## What reviewers say

### RTA Pro

[App page](https://appshunter.io/ios/app/rta-pro/id703753970)

Transform your iOS device into a professional audio analysis tool. Analyze ambient noise frequencies, pinpoint room resonance, and set up sound systems for events. Features include custom calibration, multiple display modes, and adjustable speed settings.

**Highlights:** Real-time audio spectrum analysis, Frequency range 32Hz to 16kHz, Linear, dB(A), and dB(C) weightings, 1/3 Octave Bands, Octave Bands, and FFT display, Adjustable speed settings, Custom calibration options

**In-app purchases:** none


### K

[App page](https://appshunter.io/ios/app/k-audio-72/id1257360533)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is RTA Pro free?

RTA Pro costs $5.99, with no in-app purchases.

### Is K free?

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

### Do RTA Pro or K have ads?

Neither RTA Pro nor K shows ads.

### Which is updated more often, RTA Pro or K?

RTA Pro ships an update every 3 months, and K every 3 weeks. Most recently, RTA Pro was updated on November 1, 2026 and K on October 26, 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.*