GT Max vs HB II DSP
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
GT Max
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Security at your fingertips with GT MAX, the latest generation bluetooth electronic anti-theft device for your car! The App is designed to be used by Macnil GT ALARM users through their mobile device and/or tablet, having a data network (mobile or WiFi). Once installed on your mobile device or tablet, in a few steps you will have to: - Scan the QR Code you find on the GT MAX box; - Activate the Bluetooth of your smartphone to start communicating with the GT MAX; - Register on the form that will appear on the app to receive the access password on your e-mail address - Enter username and password to log in Once you enter the App, you will get a connection with the GT MAX electronic anti-theft system installed on board the car and you will be able to: - Manage your anti-theft device directly from your smartphone - Activate and deactivate the anti-theft device from App - Perform emergency deactivation from App - Check vehicle status and send commands - Check the alarms received directly in the Reports section of the app - See all accessories associated with the GT MAX and check their battery status - Double protection: alarm activation and engine block disarming directly from App GT MAX, the evolution of the GT ALARM anti-theft system!
HB II 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 6 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 EQโs. 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. From the App it is possible to access the folders and the contained audio files.
Screenshots
Verdict
The clearest difference is update cadence: HB II DSP at fortnightly against GT Max's every 10 months. GT Max's advantage is iOS requirement (13.0 vs 15.6). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
GT Max ships an update every 10 months, HB II DSP fortnightly. The most recent releases landed on November 4, 2026 and October 28, 2026 respectively.
| Parameter | GT Max | HB II DSP |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 10 months | Fortnightly โ better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod โ better | iPhone, iPod |
| Requires iOS | 13.0 โ better | 15.6 |
| Further details โ not scored | ||
| Size | 38 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | MACNIL Gruppo ZUCCHETTI | APEX Italy |
In-app purchases
GT Max
No in-app purchases
HB II DSP
No in-app purchases









