# Marts Digital vs TR

The clearest difference is update cadence: TR at every 6 weeks against Marts Digital's every 17 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.

Marts Digital ships an update every 17 months, TR every 6 weeks. The most recent releases landed on October 28, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Marts Digital | TR |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.2 (12 ratings)](https://appshunter.io/ios/app/marts-digital/id6738837858/reviews)** | — |
| Number of ratings | **12** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 17 months | **Every 6 weeks** |
| Monetization | Free | — |
| Size | 59 MB | 57 MB |
| Requires iOS | 12.2 | 12.2 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Guang Dong Sound Power](https://appshunter.io/developer/1760446092) | [伟 陈](https://appshunter.io/developer/1837176650) |

## What reviewers say

### Marts Digital

[App page](https://appshunter.io/ios/app/marts-digital/id6738837858)

This application allows users to debug car audio devices by adjusting various parameters via a Bluetooth connection. It provides a digital interface for fine-tuning audio settings directly from a smartphone.

**Highlights:** Car audio device debugging, Bluetooth parameter adjustment, Digital interface for audio settings, Smartphone control

**Features:** macOS Compatibility

**In-app purchases:** none


### TR

[App page](https://appshunter.io/ios/app/tr-48dsp/id6754761836)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Marts Digital free?

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

### Is TR free?

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

### Do Marts Digital or TR have ads?

Neither Marts Digital nor TR shows ads.

### Which is updated more often, Marts Digital or TR?

Marts Digital ships an update every 17 months, and TR every 6 weeks. Most recently, Marts Digital was updated on October 28, 2026 and TR 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.*