GZDSP 4 vs ESX Toolkit
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
GZDSP 4
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This app enables you to control and to adjust the setup of the GROUND ZERO GZDSP 4-8X and GZDSP 4-8XII signal processor when connected to the GROUND ZERO GZDSP BT-STICK or GZDSP BTS 4-8XII streaming device. A detailed user manual can be downloaded from the GROUND ZERO web page: https://ground-zero-audio.com/ The factory set password for "Advanced Settings" is 666666 You may change the password any time Requirements for using the app: Installed and powered signal processor unit GROUND ZERO GZDSP 4-8X or XII with connected GROUND ZERO GZDSP BT-STICK or GZDSP BTS 4-8XII streaming interface. Established wireless connection between your iOS mobile device and the GZDSP BT-STICK or GZDSP BTS 4-8XII (check the devicesΒ΄s ownerΒ΄s manual for further information about creating a wireless connection). After adding the app to your iOS device and having connected the GZDSP BT-STICK or GZDSP 4-8XII in wireless mode, youΒ΄ll be able to control the main features of the GZDSP 4-8X or XII - Adjust the main volume - Mute/unmute the main volume - Select a preset (out of the 6 presets from the deviceΒ΄s memory) Furthermore, you will have access to the advanced settings of the GZDSP 4-8X signal processor: (factory set password 666666) - Input and output selection and mixer - High pass and low pass crossover setting - Channel link configuration - Channel phase control - 10-band parametric equalizer adjustment - Time alignment setup in ms/cm/inches - Reset function - Save and load presets to/from the deviceΒ΄s memory
ESX Toolkit
Control DSP tuning devices remotely via Bluetooth. Adjust EQ settings and access powerful remote control functions for audio customization.
- Bluetooth device connection
- DSP tuning control
- EQ adjustment
- Remote control functions
- Device search
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This App is a special application for controlling DSP tuning devices. You can search and connect devices through Bluetooth to achieve EQ adjustment and other powerful remote control functions.
Screenshots
Verdict
The clearest difference is update cadence: GZDSP 4 at every 3 weeks against ESX Toolkit's every 5 months. GZDSP 4 also leads on iOS requirement (8.0 vs 12.0). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
GZDSP 4 ships an update every 3 weeks, ESX Toolkit every 5 months. The most recent releases landed on October 26, 2026 and October 24, 2026 respectively.
| Parameter | GZDSP 4 | ESX Toolkit |
|---|---|---|
| Price | Free | Free |
| Positive reviews | β | 50.0% of reviews |
| Update frequency | Every 3 weeks β better | Every 5 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | β | Free |
| Devices | iPhone, iPod | iPhone, iPad, iPod β better |
| Requires iOS | 8.0 β better | 12.0 |
| Further details β not scored | ||
| Size | 48 MB | 17 MB |
| Age rating | 4+ | 9+ |
| Developer | Ground Zero GmbH | Audio Design |
In-app purchases
GZDSP 4
No in-app purchases
ESX Toolkit
No in-app purchases








