HARMONY DSP vs Marts Digital
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
HARMONY DSP
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The Harmony DSP App allows you to setup and tune your system with your smart phone or tablet. In the main screen you will find the Input Source menu where you can choose BT, HI-LEV, USB and AUX. Here you also find 8 Presets (saved into your device) to choose from, you access the Music Player, you have the Main and Subwoofer Volume, and the Advanced menu with Channels, EQ, System and Mixing. From the Channel Page, you can assign the function of each speaker, check the Phase for polarity, adjust the individual Channel Gains and set Delay in milliseconds or centimeters, for a rock solid and accurate front stage. The EQ page holds the heart and the brains of the App. You can use either the Graphic or the Paragraphic EQ’s. You can customize the crossovers to fit the needs of your individual system. You have adjustments for Gain, frequency, and Q factor. You can work on channels individually or you can link them. With the MIX function you can manually determine which inputs (USB-L/R, Digital-L/R, BT-L/R) will be used for each output (processing channel) and how much of each input the output will receive. The new Music Player function lets you have full control of all your favorite songs, inside the App. Be sure to connect a proper USB device containing audio files in the supported format (MP2/4, WMA, APE, FLAC, AAC, M4A,WAV, AIF, AIFC). From the App it is possible to access the folders and the contained audio files.
Marts Digital
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.
- Car audio device debugging
- Bluetooth parameter adjustment
- Digital interface for audio settings
- Smartphone control
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Marts Digital is an app debugging software for car audio devices, which adjusts various parameters of the device through Bluetooth connection.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | HARMONY DSP | Marts Digital |
|---|---|---|
| Price | Free | Free |
| Rating | — | 2.2 (12 ratings) — better |
| Positive reviews | — | 0.0% of reviews |
| Number of ratings | — | 12 — better |
| Update frequency | Every 19 months | Every 17 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 11.0 — better | 12.2 |
| Further details — not scored | ||
| Size | 3 MB | 59 MB |
| Age rating | 4+ | 4+ |
| Developer | APEX Italy | Guang Dong Sound Power |
In-app purchases
HARMONY DSP
No in-app purchases
Marts Digital
No in-app purchases
