# HARMONY DSP vs A894DSP

The clearest difference is update cadence: A894DSP at every 2 months against HARMONY DSP's every 19 months. A894DSP also leads on iOS requirement (9.0 vs 11.0). 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.

HARMONY DSP ships an update every 19 months, A894DSP every 2 months. The most recent releases landed on May 16, 2026 and July 31, 2026 respectively.

## The numbers

| Metric | HARMONY DSP | A894DSP |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 19 months | **Every 2 months** |
| Size | 3 MB | 18 MB |
| Requires iOS | 11.0 | **9.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [APEX Italy](https://appshunter.io/developer/1446565085) | [杏生 卢](https://appshunter.io/developer/1094592555) |

## What reviewers say

### HARMONY DSP

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

**Features:** macOS Compatibility

**In-app purchases:** none


### A894DSP

[App page](https://appshunter.io/ios/app/a894dsp/id6479791591)

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

**In-app purchases:** none


## Frequently asked questions

### Is HARMONY DSP free?

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

### Is A894DSP free?

A894DSP is free to download, with no in-app purchases.

### Do HARMONY DSP or A894DSP have ads?

Neither HARMONY DSP nor A894DSP shows ads.

### Which is updated more often, HARMONY DSP or A894DSP?

HARMONY DSP ships an update every 19 months, and A894DSP every 2 months. Most recently, HARMONY DSP was updated on May 16, 2026 and A894DSP on July 31, 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.*