DiagonalOBDII vs CNC · G
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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
CNC · G
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The complete CNC reference, always in your pocket. Works 100% offline: no network needed on the shop floor. WHAT'S INSIDE • 149 G-codes and 115 M-codes explained, with syntax, parameters, examples and toolpath diagrams • 105 canned cycles (drilling, threading, pockets and more) • 90 workshop calculators and formulas: cutting speed, RPM, feeds and much more • G-code analyzer with graphic toolpath preview • Materials database with cutting parameters • Fanuc and Siemens alarms explained • Technical glossary and tables (threads, tolerances…) • Available in 18 languages FREE AND PRO The free version includes a complete sample of the reference, the glossary and all languages. One single one-time purchase unlocks EVERYTHING, forever: no subscription, no recurring costs. Made by machinists, for machinists.
Screenshots
Verdict
The clearest difference is update cadence: CNC · G at every 2 days against DiagonalOBDII's every 2 weeks. CNC · G also leads on iOS requirement (16.4 vs 18.1). 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. DiagonalOBDII sells 4 in-app purchases, starting at $12.99 per month and CNC · G sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
DiagonalOBDII ships an update every 2 weeks, CNC · G every 2 days. The most recent releases landed on October 22, 2026 and October 24, 2026 respectively.
| Parameter | DiagonalOBDII | CNC · G |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 2 weeks | Every 2 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone | iPhone |
| Requires iOS | 18.1 | 16.4 — better |
| Further details — not scored | ||
| Size | 21 MB | 94 MB |
| Age rating | 4+ | 4+ |
| Developer | Kyle Louderback | silverio valerio brandao |
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
CNC · G
- Pro — Tuo per sempre$17.99









