# DSI vs DS18 iDSP

The clearest difference is rating: DSI at 3.7 against DS18 iDSP's 1.0. DSI also leads on update cadence (every 2 months vs every 6 months) and ratings volume (3 vs 1). On price, ads, in-app purchases and monetization model there is nothing between them.

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

DSI holds the better App Store score, 3.7 against 1.0. Both are backed by a comparable volume of ratings — 3 and 1 respectively.

DSI ships an update every 2 months, DS18 iDSP every 6 months. The most recent releases landed on October 24, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | DSI | DS18 iDSP |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.7 (3 ratings)](https://appshunter.io/ios/app/dsi-3/id1544985377/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/ds18-idsp/id6755451912/reviews) |
| Number of ratings | **3** | 1 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 6 months |
| Monetization | Free | Free |
| Size | 12 MB | 59 MB |
| Requires iOS | **9.0** | 12.2 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [DD Audio](https://appshunter.io/developer/599474306) | [SPIRIT LLC](https://appshunter.io/developer/1327651109) |

## What reviewers say

### DSI

[App page](https://appshunter.io/ios/app/dsi-3/id1544985377)

This application allows users to fine-tune their car audio systems using a digital signal processor. It offers comprehensive controls for equalization, crossovers, time alignment, and more, suitable for both professionals and enthusiasts.

**Highlights:** Bluetooth 5.0 connectivity, 6 customizable presets, 31-band parametric EQ per channel, Phase correction, Crossover adjustments, Input/output level controls, Time alignment

**Features:** macOS Compatibility

**In-app purchases:** none


### DS18 iDSP

[App page](https://appshunter.io/ios/app/ds18-idsp/id6755451912)

Control specific digital sound processor models with a user-friendly interface. Adjust audio settings like routing, gain, crossover, and equalization in real-time. Includes a demo mode for learning and battery/limiter monitoring.

**Highlights:** Channel Routing, Gain Control (General & Channel), Crossover Settings, Limiter & Equalizer Adjustments, Time Alignment, Configurable Memories, Battery & Limiter Monitoring

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is DSI free?

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

### Is DS18 iDSP free?

DS18 iDSP is free to download, with no in-app purchases.

### Which has better reviews, DSI or DS18 iDSP?

DSI is rated higher. DSI averages 3.7 out of 5 from 3 ratings, while DS18 iDSP averages 1.0 from 1 ratings.

### Do DSI or DS18 iDSP have ads?

Neither DSI nor DS18 iDSP shows ads.

### Which is updated more often, DSI or DS18 iDSP?

DSI ships an update every 2 months, and DS18 iDSP every 6 months. Most recently, DSI was updated on October 24, 2026 and DS18 iDSP on October 20, 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.*