DiagonalOBDII vs BoostSpeed Pro
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
BoostSpeed Pro
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the new product from Ecu=shop, is the ultimate electronic throttle controller, developed as an evolution of Boost Speed Next to give you a superior driving experience and meet all your needs. With modern technology, Boost Speed Pro gives you precise and independent control over your car's throttle response, along with a wide range of useful functions. Key Features: THROTTLE RESPONSE: A throttle response enhancement mode with 14 adjustable levels for a more agile and exciting drive. ECO MODE: A fuel-saving mode that you can customize to fit your driving style. CUSTOM MODE: A special feature for Boost Speed Pro that provides 3 modes (C1, C2, C3) to save different throttle settings, allowing for flexible use in various driving situations. ANTI-SLIP MODE: Reduces engine power to help prevent wheel spin, enhancing safety when driving on slippery or muddy roads. ANTI-THEFT MODE: An anti-theft mode that allows you to set a one-time password for maximum security when parking your vehicle. RAMBLE MODE: An engine sound mode that simulates a race car engine for a more thrilling experience. WINCH MODE: Increases engine RPM to ensure smooth and efficient operation of an electric winch. SMOKE LIMIT: A mode designed to reduce the amount of exhaust smoke. Boost Speed Pro is more than just a throttle controller; it's your personal assistant to elevate your driving performance and safety. It caters to all driving needs, whether for city driving, long journeys, or even off-road adventures. With cutting-edge technology and ease of use, Boost Speed Pro is an essential device for your vehicle. Boost Speed Pro is designed as a Plug & Play device, making it easy to install yourself without any wire cutting or complex modifications, keeping your car safe and your warranty intact. Take complete control of your vehicle's performance with Boost Speed Pro from Ecu=shop.
Screenshots
Verdict
The clearest difference is in-app purchases: BoostSpeed Pro at none against DiagonalOBDII's 4. BoostSpeed Pro also leads on iOS requirement (12.0 vs 18.1). DiagonalOBDII's advantage is update cadence (every 2 weeks vs every 2 months). On price, ads 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. BoostSpeed Pro asks for nothing beyond the download.
DiagonalOBDII ships an update every 2 weeks, BoostSpeed Pro every 2 months. The most recent releases landed on October 22, 2026 and October 25, 2026 respectively.
| Parameter | DiagonalOBDII | BoostSpeed Pro |
|---|---|---|
| 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 — better | Every 2 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone | iPhone, iPod — better |
| Requires iOS | 18.1 | 12.0 — better |
| Further details — not scored | ||
| Size | 21 MB | 36 MB |
| Age rating | 4+ | 17+ |
| Developer | Kyle Louderback | ECU=SHOP |
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
BoostSpeed Pro
No in-app purchases









