# EDSP4 vs DSP

The clearest difference is iOS requirement: EDSP4 at 9.0 against DSP's 13.1. 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.

## 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 | — |
| Monetization | Free | — |
| Size | 51 MB | 3 MB |
| Requires iOS | **9.0** | 13.1 |
| 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/id6479982677)

**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.

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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.*