# EDSP4 vs DSP

The clearest difference is iOS requirement: EDSP4 at 9.0 against DSP's 15.6. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

EDSP4 ships an update every 19 months, DSP every 15 months. The most recent releases landed on October 11, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | EDSP4 | DSP |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 19 months | **Every 15 months** |
| Monetization | Free | — |
| Size | 51 MB | 2 MB |
| Requires iOS | **9.0** | 15.6 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Cheng Pu Chiang](https://appshunter.io/developer/1427247397) | [东山 谢](https://appshunter.io/developer/1634156531) |

## What reviewers say

### EDSP4

[App page](https://appshunter.io/ios/app/edsp4-31bt/id1462558049)

A convenient and professional tuning app with Bluetooth 4.0 support. It offers 6 sound effect modes and 31-band EQ adjustment for a unique audio experience. The interface includes a player that supports USB playback.

**Highlights:** Bluetooth 4.0 connectivity, 6 built-in sound effect modes, 31-band equalizer adjustment, Player interface, USB playback support

**Features:** macOS Compatibility

**In-app purchases:** none


### DSP

[App page](https://appshunter.io/ios/app/dsp-4680-pro/id6479560759)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is EDSP4 free?

EDSP4 is free to download, with no in-app purchases.

### Is DSP free?

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

### Do EDSP4 or DSP have ads?

Neither EDSP4 nor DSP shows ads.

### Which is updated more often, EDSP4 or DSP?

EDSP4 ships an update every 19 months, and DSP every 15 months. Most recently, EDSP4 was updated on October 11, 2026 and DSP on October 25, 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.*