# A544DSP vs PZ

The clearest difference is update cadence: A544DSP at every 5 weeks against PZ's every 12 months. 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.

A544DSP ships an update every 5 weeks, PZ every 12 months. The most recent releases landed on October 6, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | A544DSP | PZ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/pz-c7/id6630366976/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 12 months |
| Monetization | — | Free |
| Size | 21 MB | 2 MB |
| Requires iOS | 9.0 | 9.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [杏生 卢](https://appshunter.io/developer/1094592555) | [huizhou shangshui technology co.,ltd](https://appshunter.io/developer/1762340195) |

## What reviewers say

### A544DSP

[App page](https://appshunter.io/ios/app/a544dsp/id1670363148)

**Features:** macOS Compatibility

**In-app purchases:** none


### PZ

[App page](https://appshunter.io/ios/app/pz-c7/id6630366976)

This application provides advanced audio tuning for car amplifiers, featuring plug-and-play installation and powerful DSP processing. It allows for precise adjustments to sound fields, equalization, and dynamic music processing via a smartphone interface.

**Highlights:** Plug & play installation, Quad-core 32-bit DSP processing, Lossless audio playback, 15-band EQ tuning, Adjustable sound field delay, Built-in Bluetooth for music streaming, Smartphone control

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is A544DSP free?

A544DSP is free to download, with no in-app purchases.

### Is PZ free?

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

### Do A544DSP or PZ have ads?

Neither A544DSP nor PZ shows ads.

### Which is updated more often, A544DSP or PZ?

A544DSP ships an update every 5 weeks, and PZ every 12 months. Most recently, A544DSP was updated on October 6, 2026 and PZ on October 24, 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.*