# HARMONY DSP vs Marts Digital

HARMONY DSP and Marts Digital are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

HARMONY DSP ships an update every 19 months, Marts Digital every 17 months. The most recent releases landed on October 27, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | HARMONY DSP | Marts Digital |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[2.2 (12 ratings)](https://appshunter.io/ios/app/marts-digital/id6738837858/reviews)** |
| Number of ratings | — | **12** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 19 months | **Every 17 months** |
| Monetization | — | Free |
| Size | 3 MB | 59 MB |
| Requires iOS | **11.0** | 12.2 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [APEX Italy](https://appshunter.io/developer/1446565085) | [Guang Dong Sound Power](https://appshunter.io/developer/1760446092) |

## What reviewers say

### HARMONY DSP

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Marts Digital

[App page](https://appshunter.io/ios/app/marts-digital/id6738837858)

This application allows users to debug car audio devices by adjusting various parameters via a Bluetooth connection. It provides a digital interface for fine-tuning audio settings directly from a smartphone.

**Highlights:** Car audio device debugging, Bluetooth parameter adjustment, Digital interface for audio settings, Smartphone control

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is HARMONY DSP free?

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

### Is Marts Digital free?

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

### Do HARMONY DSP or Marts Digital have ads?

Neither HARMONY DSP nor Marts Digital shows ads.

### Which is updated more often, HARMONY DSP or Marts Digital?

HARMONY DSP ships an update every 19 months, and Marts Digital every 17 months. Most recently, HARMONY DSP was updated on October 27, 2026 and Marts Digital on October 28, 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.*