# RTA Audio vs DSI

The clearest difference is in-app purchases: DSI at none against RTA Audio's 1. DSI also leads on update cadence (every 7 months vs every 28 months) and iOS requirement (8.0 vs 15.6). RTA Audio's advantage is ratings volume (31 vs 8). On price, rating, review sentiment and ads there is nothing between them.

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

DSI holds the better App Store score, 3.8 against 3.6. Both are backed by a comparable volume of ratings — 31 and 8 respectively. Written reviews complicate that: 59% of RTA Audio's written reviews are positive against 57% of DSI's, so the app with the better star average is not the one people write more warmly about.

RTA Audio ships an update every 28 months, DSI every 7 months. The most recent releases landed on October 15, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | RTA Audio | DSI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.6 (31 ratings)](https://appshunter.io/ios/app/rta-audio/id525324684/reviews) | **[3.8 (8 ratings)](https://appshunter.io/ios/app/dsi-2/id1379793450/reviews)** |
| Number of ratings | **31** | 8 |
| Positive reviews | **58.5% of reviews** | 57.1% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 28 months | **Every 7 months** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 2 MB | 38 MB |
| Requires iOS | 15.6 | **8.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [New Ball s.r.o.](https://appshunter.io/developer/1178970340) | [DD Audio](https://appshunter.io/developer/599474306) |

## What reviewers say

### RTA Audio

[App page](https://appshunter.io/ios/app/rta-audio/id525324684)

Analyze audio in real-time with detailed frequency spectrum and waveform visualizations. Record and export your audio analysis results, including spectrograms and frequency tables, for sharing or archiving.

**Highlights:** Real-time audio analysis (FFT), Recording and offline processing, Spectrogram and waveform visualization, Exportable analysis reports (PDF), Adjustable resolution and frequency scale, Peak and RMS metering

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Upgrade to full version | $14.99 | one-time |


### DSI

[App page](https://appshunter.io/ios/app/dsi-2/id1379793450)

This app provides comprehensive tools to fine-tune your car audio system with a digital signal processor. It offers a straightforward interface for adjusting equalization, phase, crossover, and time alignment for optimal sound.

**Highlights:** Bluetooth 4.0 compatible, 6 customizable presets, 10-band parametric EQ per channel, Phase correction, Crossover adjustments, Time alignment, Input summing and linking

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is RTA Audio free?

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

### Is DSI free?

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

### Which has better reviews, RTA Audio or DSI?

DSI is rated higher. RTA Audio averages 3.6 out of 5 from 31 ratings, while DSI averages 3.8 from 8 ratings.

### Do RTA Audio or DSI have ads?

Neither RTA Audio nor DSI shows ads.

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

RTA Audio ships an update every 28 months, and DSI every 7 months. Most recently, RTA Audio was updated on October 15, 2026 and DSI on September 15, 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.*