aRacerOBD vs UMA M9
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
aRacerOBD
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The functions include: 1. Engine data monitoring from ECU in real time. 2. Shows and resets engine DTC codes in the ECU. 3. Component test function for inspecting the component activation. (Injector, Fuel pump, ignition coil, etc.) 4. Shows the ECU information. (Hardware version, software version, etc.)
UMA M9
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.
- Engine data monitoring
- Malf-code reading
- Fuel adjustment
- Engine tuning
- Tuning map sharing
- Cloud ECU firmware access
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M9 APP supports UMA M9 ECU. The main functions are as below: 1. Engine data monitor 2. Malf-code read 3. Engine tuning: 3.1 Fuel Adj., Fuel Acc. 3.2 Fuel Temperature Compensation 3.3 IG, 3.4 Idle RPM, RPM Limit, VVA Control, Speed Gain, Coolant Fan 3.5 Auto Tune, 3.6 Idle Lope, Backfire 4. Tuning map sharing 5. QuickBurn: Cloud data of ECU firmware and calibration file 6. Function upgrade: Choosing and purchasing the upgrated function by user.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | aRacerOBD | UMA M9 |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Update frequency | Every 8 months | Every 6 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 10.0 — better | 11.0 |
| Further details — not scored | ||
| Size | 17 MB | 117 MB |
| Age rating | 4+ | 4+ |
| Developer | ARACER SPEEDTEK INC. | UMA RACING SDN. BHD. |
In-app purchases
aRacerOBD
No in-app purchases
UMA M9
No in-app purchases
