# DSI vs HARMONY DSP

The clearest difference is update cadence: DSI at every 2 months against HARMONY DSP's every 19 months. DSI also leads on iOS requirement (9.0 vs 11.0). On price, ads, in-app purchases and device support there is nothing between them.

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

DSI ships an update every 2 months, HARMONY DSP every 19 months. The most recent releases landed on September 9, 2026 and May 16, 2026 respectively.

## The numbers

| Metric | DSI | HARMONY DSP |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/dsi-3/id1544985377/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 19 months |
| Monetization | Free | — |
| Size | 12 MB | 3 MB |
| Requires iOS | **9.0** | 11.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [DD Audio](https://appshunter.io/developer/599474306) | [APEX Italy](https://appshunter.io/developer/1446565085) |

## What reviewers say

### 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


### HARMONY DSP

[App page](https://appshunter.io/ios/app/harmony-dsp/id1638244924)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is DSI free?

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

### Is HARMONY DSP free?

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

### Do DSI or HARMONY DSP have ads?

Neither DSI nor HARMONY DSP shows ads.

### Which is updated more often, DSI or HARMONY DSP?

DSI ships an update every 2 months, and HARMONY DSP every 19 months. Most recently, DSI was updated on September 9, 2026 and HARMONY DSP on May 16, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*