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DiagonalOBDII

DiagonalOBDII

OBDII Drive Cycle App

0 ratings
1 review
🔧 Utilities
📊 Productivity
Free
In-App Purchases

Details

  • Released
  • Updated
  • August 7, 2025
  • February 15, 2026

Developer

Kyle Louderback
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🧾$12.99 - $99.99
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About

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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What's New in DiagonalOBDII

2.3

February 15, 2026

Bug fixes

Subscription plans

Diagonal Premium Monthly

Premium Drive Cycle - Monthly

$12.991 Month
How to cancel DiagonalOBDII subscription ⁉️

User reviews

Most RecentHighest RatedLowest Rated

Free Version - Meh

Couldn’t get it to connect to my OBDii MX+ adapter. No help or troubleshooting features to help fix the connection problem. Have to give it 1 star only based on connectivity failure.
King Wins-a-lotKing Wins-a-lot

Response from developer

Thanks for your feedback, and we're sorry you had trouble connecting to your OBD-II MX+ adapter. We’re always working to improve compatibility and would love to help resolve this for you. If you're open to it, we'd be thrilled to have you test using our own hardware—for free. It’s specially tuned to work smoothly with the app. Please email us at support@drivecycle.app and we’ll get it sent out to you and help troubleshoot the connection issue. Thanks again for giving us a try!

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FAQ

What is DiagonalOBDII used for?

DiagonalOBDII is used by mechanics to simplify and speed up vehicle drive cycles. It provides real-time tracking of emissions monitors and diagnostic trouble codes (DTCs) to ensure accurate diagnostics and vehicle readiness for inspection.

Does DiagonalOBDII have ads?

No, DiagonalOBDII does not contain advertisements. The app is free to download and use, with optional in-app purchases for premium features.

What subscription plans are available for DiagonalOBDII?

DiagonalOBDII offers several subscription plans, including a 'Diagonal Premium Trial' for $12.99/month with a free trial, 'Diagonal Premium Monthly' for $12.99/month, 'Shop Owner - Monthly' for $17.99/month, and 'Diagonal Premium Yearly' for $99.99/year.

How does DiagonalOBDII help mechanics save time?

DiagonalOBDII saves mechanics valuable time by allowing them to complete diagnostic drive cycles accurately the first time. It streamlines workflows by immediately identifying vehicle readiness for faster inspections and reducing diagnostic uncertainty with clear, real-time data.

What kind of drive cycle parameters does DiagonalOBDII monitor?

DiagonalOBDII monitors essential drive cycle parameters such as speed, RPM, engine temperature, and throttle position. This precise guidance helps users meet exact diagnostic requirements for vehicles.

Is DiagonalOBDII available on multiple devices?

Based on the provided data, DiagonalOBDII is currently supported on iPhones. Information regarding Android or other platform compatibility is not available.

How often is DiagonalOBDII updated?

The latest version of DiagonalOBDII is 2.3, which was last updated on February 15, 2026. This indicates a recent update, suggesting the app is actively maintained.

What is the age rating for DiagonalOBDII?

DiagonalOBDII has an age rating of 4+. This suggests it is suitable for a wide range of users, including younger individuals, though its primary audience is professional mechanics.