bmTuned vs DiagonalOBDII
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
bmTuned
This platform allows BMW owners to customize their vehicles' engine control units (ECUs) and automatic transmissions (TCUs). It also enables seamless conversion between AWD and RWD modes for supported xDrive models.
- ECU tuning for N54, N55, N13 engines
- Flash off-the-shelf maps
- Adjust automatic transmission settings
- Customize AWD xDrive vehicles
- Convert between AWD and RWD modes
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bmTuned is a multi-platform flash tuning solution for your BMW. Utilizing the bmTuned Tuning Platform, you are able to customize your supported vehicle in a number of ways. (ECU) N54, N55 (E & F-Series), N13 support. Flash off the shelf (OTS) maps. More options/settings coming soon. (TCU) You may adjust the automatic transmission (ZF 6HP/8HP) through the use of quick customizable settings - modifying both offline and on the website. As well as the ability to find and use pre-customized maps that may be supported for your specific software version. (AWD) bmTuned allows you to customize your AWD xDrive BMW & seamlessly convert between AWD and RWD operation with the press of a button on your phone or tablet in about 25 seconds or faster depending on the age (series) of vehicle, where supported.
DiagonalOBDII
This app helps mechanics perform vehicle drive cycles more efficiently. It provides real-time monitoring of emissions monitors and diagnostic trouble codes (DTCs), offering clear guidance and instant explanations to ensure vehicles pass inspection quickly and accurately.
- Live drive cycle monitoring
- Immediate diagnostic trouble code (DTC) identification
- Real-time emissions monitor status
- Precise drive cycle parameter guidance
- Professional, easy-to-navigate dashboard
- Instant code explanations
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Diagonal is designed specifically for mechanics who want to simplify and speed up vehicle drive cycles. Instantly track emissions monitors and diagnostic trouble codes (DTCs) live, ensuring accurate diagnostics and rapid vehicle readiness for inspection. Key Features: -Live Drive Cycle Monitoring: Clearly see the real-time status of emissions monitors as they run, complete, or require further action during your drive. -Immediate Diagnostics: Quickly identify and address active trouble codes (DTCs) as they appear, eliminating uncertainty during drive cycles. -Efficiency and Accuracy: Avoid unnecessary repeat drive cycles by verifying real-time monitor completion, ensuring vehicles pass inspection on the first try. -Precise Drive Cycle Guidance: Monitor essential drive cycle parameters such as speed, RPM, engine temperature, and throttle position to meet exact diagnostic requirements. -Professional Dashboard: Access all critical information quickly through a clear, easy-to-navigate interface tailored for automotive professionals. -Instant Code Explanations: Quickly interpret trouble codes with straightforward, mechanic-friendly explanations. Why Mechanics Trust Diagonal: -Saves Valuable Time: Complete diagnostic drive cycles accurately the first time. -Faster Inspections: Immediately identify vehicle readiness to streamline your workflow. -Reduces Diagnostic Uncertainty: Clear, actionable data presented in real-time. -Diagonal empowers professional technicians with the tools to perform diagnostics faster and more efficiently than ever before. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://diagonal-d070c.web.app/privacy.html
Screenshots
Verdict
The clearest difference is rating: DiagonalOBDII at 5.0 against bmTuned's 3.0. DiagonalOBDII also leads on update cadence (every 2 weeks vs every 7 months). bmTuned's advantage is in-app purchases (none vs 4) and device support (4 vs 1). On price, ratings volume and ads 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. DiagonalOBDII sells 4 in-app purchases, starting at $12.99 per month. bmTuned asks for nothing beyond the download.
DiagonalOBDII holds the better App Store score, 5.0 against 3.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively.
bmTuned ships an update every 7 months, DiagonalOBDII every 2 weeks. The most recent releases landed on September 14, 2026 and October 5, 2026 respectively.
| Parameter | bmTuned | DiagonalOBDII |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (2 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | — | 0.0% of reviews |
| Number of ratings | 2 — better | 1 |
| Update frequency | Every 7 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone |
| Requires iOS | 15.6 — better | 18.1 |
| Further details — not scored | ||
| Size | 13 MB | 21 MB |
| Age rating | 4+ | 4+ |
| Developer | OddsMedia, LLC | Kyle Louderback |
Customer experience
bmTuned
DiagonalOBDII
In-app purchases
bmTuned
No in-app purchases
DiagonalOBDII
- Diagonal Premium Monthly$12.991 Month
- Diagonal Premium Trial1 Month trial$12.991 Month
- Shop Owner - Monthly$17.991 Month
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- Diagonal Premium Yearly$99.991 Year









