# aRacerOBD vs UMA M9

The clearest difference is update cadence: UMA M9 at every 6 weeks against aRacerOBD's every 8 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.

aRacerOBD ships an update every 8 months, UMA M9 every 6 weeks. The most recent releases landed on October 10, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | aRacerOBD | UMA M9 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/uma-m9/id6450772085/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 6 weeks** |
| Monetization | — | Free |
| Size | 17 MB | 117 MB |
| Requires iOS | **10.0** | 11.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ARACER SPEEDTEK INC.](https://appshunter.io/developer/1218691866) | [UMA RACING SDN. BHD.](https://appshunter.io/developer/1403287201) |

## What reviewers say

### aRacerOBD

[App page](https://appshunter.io/ios/app/aracerobd/id1448664407)

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

**In-app purchases:** none


### UMA M9

[App page](https://appshunter.io/ios/app/uma-m9/id6450772085)

This application connects to a specific engine control unit (ECU) to monitor engine data, read diagnostic trouble codes, and perform various engine tuning adjustments. It also allows for tuning map sharing and accessing cloud-based ECU firmware and calibration files.

**Highlights:** Engine data monitoring, Malf-code reading, Fuel adjustment, Engine tuning, Tuning map sharing, Cloud ECU firmware access

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is aRacerOBD free?

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

### Is UMA M9 free?

UMA M9 is free to download, with no in-app purchases.

### Do aRacerOBD or UMA M9 have ads?

Neither aRacerOBD nor UMA M9 shows ads.

### Which is updated more often, aRacerOBD or UMA M9?

aRacerOBD ships an update every 8 months, and UMA M9 every 6 weeks. Most recently, aRacerOBD was updated on October 10, 2026 and UMA M9 on October 16, 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.*