# AX vs DSI

The clearest difference is rating: DSI at 3.7 against AX's 2.2. DSI also leads on iOS requirement (9.0 vs 12.1). On price, ratings volume, update cadence and ads there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

DSI holds the better App Store score, 3.7 against 2.2. Both are backed by a comparable volume of ratings — 5 and 3 respectively.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 3, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | AX | DSI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.2 (5 ratings)](https://appshunter.io/ios/app/ax-dsp-xl/id1495854432/reviews) | **[3.7 (3 ratings)](https://appshunter.io/ios/app/dsi-3/id1544985377/reviews)** |
| Number of ratings | **5** | 3 |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Free | Free |
| Size | 10 MB | 12 MB |
| Requires iOS | 12.1 | **9.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Metra Electronics Corp.](https://appshunter.io/developer/1133973919) | [DD Audio](https://appshunter.io/developer/599474306) |

## What reviewers say

### AX

[App page](https://appshunter.io/ios/app/ax-dsp-xl/id1495854432)

Enhance your car's audio system with this digital signal processor. It offers an all-in-one solution for various audio setups, allowing for improved sound quality and subwoofer integration while preserving factory features. Control settings easily via a smartphone app.

**Highlights:** Digital Signal Processor, Subwoofer integration, Preserves OE features, Bluetooth smartphone control, Vehicle-specific T-Harnesses (sold separately), All-in-one solution

**Features:** macOS Compatibility

**In-app purchases:** none


### DSI

[App page](https://appshunter.io/ios/app/dsi-3/id1544985377)

This application allows users to fine-tune their car audio systems using a digital signal processor. It offers comprehensive controls for equalization, crossovers, time alignment, and more, suitable for both professionals and enthusiasts.

**Highlights:** Bluetooth 5.0 connectivity, 6 customizable presets, 31-band parametric EQ per channel, Phase correction, Crossover adjustments, Input/output level controls, Time alignment

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is AX free?

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

### Is DSI free?

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

### Which has better reviews, AX or DSI?

DSI is rated higher. AX averages 2.2 out of 5 from 5 ratings, while DSI averages 3.7 from 3 ratings.

### Do AX or DSI have ads?

Neither AX nor DSI shows ads.

### Which is updated more often, AX or DSI?

AX ships an update every 2 months, and DSI every 2 months. Most recently, AX was updated on October 3, 2026 and DSI 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.*