OTR Diagnostics vs RoadRec
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
OTR Diagnostics
This app helps heavy-duty truck owners diagnose and resolve common issues like fault codes, regen problems, and derates. It provides plain-language explanations of error codes, allows for bi-directional commands to fix issues, and monitors live truck data to prevent downtime.
- AI-powered fault code explanation
- Bi-directional commands for repairs
- Reset active/inactive fault codes
- Run forced DPF/SCR regens
- Live data monitoring
- Fault code history tracking
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OTR Diagnostics — Trusted by 10,000+ Truck Owners Dealing with regen problems, nonstop alerts, fault codes, and unexpected derates on your heavy duty truck? You are not alone. More than 10,000 truck owners and fleets trust OTR Diagnostics to take control, cut downtime, and avoid expensive dealer visits. Powered by OTR Assist + OTR LINK 2 This is more than a scan tool. OTR Assist is your AI partner, breaking down fault codes in plain language and helping you troubleshoot and decide if you can keep driving or need service now. Paired with OTR LINK 2, our proprietary Bluetooth adapter, you get faster connection speeds, more accurate fault code data, and more live data parameters than ever before. It is 5X better than previous hardware. Ask us how to get a FREE upgrade today. Commands That Keep You Moving With bi-directional commands built right into OTR Diagnostics, you are no longer stuck waiting on a shop to do what you can handle yourself. Reset active and inactive fault codes Reset the entire aftertreatment system Reset derates that slow you down Reset soot levels after a DPF service Run forced DPF or SCR regens right from the cab These commands put you back in control, saving you time, money, and downtime. Fault Code Insights Go beyond a flashing dash light. OTR Diagnostics helps you understand fault codes with the same level of detail as dealer software, but in plain language you can actually use. Decode your dash lights Uncover the root causes of issues Track how often a problem occurs Know which repairs or parts are needed Live Data Monitoring Want to know if your regen is working? Want to monitor exhaust temps, soot levels, or DEF? OTR Diagnostics lets you see your truck’s vitals in real time so you can spot issues before they stop you. Common live data parameters include: DPF fluid level DPF soot level EGR valve position Aftertreatment exhaust temps Boost pressure Accelerator pedal position Engine fuel delivery pressure Available live data may vary depending on the engine model your device is connected to. Explore Your History Recurring problems? OTR Diagnostics logs every fault code and command so you can see when issues happened, when they were cleared, and how long regens lasted. Proven. Tested. Backed by Support We run OTR Diagnostics, OTR Assist, and OTR LINK 2 on our own fleet of test trucks including late model Paccar MX engines to make sure everything works before it reaches you. That is why more than 10,000 drivers already trust OTR Diagnostics. Made in Michigan. Built for You We engineer, assemble, and ship right from our shop in Macomb, MI. If you are nearby, stop in and see us. Coverage We support a wide range of heavy duty engines: Cummins: CM871, CM2150, CM2250, CM2350 (2008–2024) Detroit Diesel: DD60, MBE, DD13, DD15, DD16 (2008–2024) Paccar: MX11, MX13 (2011–2024), PX7, PX9 (2008–2024) Volvo: D11, D13, D13TC, D16 (2014–2024) Mack: MP7, MP8, MP8HE, MP10 (2014–2024) For the full list of compatible models, call or text us at 586-799-4375. Need Help or Have Questions? Call or text us anytime at 586-799-4375 or email support@otrperformance.com.
RoadRec
This utility app acts as a safety guard for your travels by connecting to a dash cam recorder via WiFi. It allows you to view, download, and save videos and pictures, including emergency recordings, directly to your phone. You can also adjust the recorder's settings through the application.
- Connects to dash cam via WiFi
- View general and emergency videos
- Save and download recordings
- Manage pictures
- Configure dash cam settings
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RoadRec is a dash cam application. This product serves as a safety guard for your personal travel. The app application connects to the recorder through WiFi, allowing you to directly play general videos, emergency videos, and pictures on your phone. You can also download and save them to a file list for browsing, and make relevant settings for the recorder. 【 Warm Reminder 】 1.The function of obtaining the user's work trajectory during a specific time period will continue to use GPS positioning services, and switching to the background will still maintain GPS connection, which will consume more electricity compared to other operations. Continuous operation of GPS in the background can affect battery life. 2. This application has the function of requiring persistent location, as it is used to obtain the user's work trajectory during a specific time period. You need to agree to use the persistent location function, which has been declared in the UIContextModes key of the project info.plist file. 3. Disclaimer: The attached file is a Chinese version of the authorization letter for the Sarmert and OMBAR brands. This application contains content or functionality from Sarmert and OMNAR brands and can control the driving recorder from Sarmert and OMNAR brands. We are the manufacturer of Sarmert and OMNAR brands, and Apple Inc. is not responsible for any infringement of the other party's rights by the application.
Screenshots
Verdict
The clearest difference is rating: OTR Diagnostics at 4.0 against RoadRec's 1.7. OTR Diagnostics also leads on review sentiment (55% vs 16%) and update cadence (fortnightly vs monthly). RoadRec's advantage is monetization model (free vs free with in-app purchases) and iOS requirement (12.0 vs 17.6). On price, ratings volume, ads and in-app purchases 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.
OTR Diagnostics holds the better App Store score, 4.0 against 1.7. Both are backed by a comparable volume of ratings — 99 and 34 respectively. Written reviews point the same way: 55% of OTR Diagnostics's written reviews are positive against 16% of RoadRec's.
OTR Diagnostics ships an update fortnightly, RoadRec monthly. The most recent releases landed on September 23, 2026 and September 17, 2026 respectively.
| Parameter | OTR Diagnostics | RoadRec |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (99 ratings) — better | 1.7 (34 ratings) |
| Positive reviews | 55.2% of reviews — better | 15.8% of reviews |
| Number of ratings | 99 — better | 34 |
| Update frequency | Fortnightly — better | Monthly |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 17.6 | 12.0 — better |
| Further details — not scored | ||
| Size | 266 MB | 185 MB |
| Age rating | 4+ | 4+ |
| Developer | OTR Performance | EFORYOU INC |
Customer experience
OTR Diagnostics
RoadRec
Bugs and requests
OTR Diagnostics
Reported bugs
10 issues- App constantly disconnects from device
- Generic code option disappeared
- Forced regen is no longer consistent
- AI assistant not working
- App asks to do things not available in app
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- Bluetooth connection rejects
- App doesn't work without data connection
- Forced regen not activating after updates
- Login authentication errors
- Cannot start regen process on newer models
Requested features
5 requests- Remember email address for login
- Allow offline functionality without data connection
- Add option to change speed
- More detailed diagnostic information
- Allow basic subscription to work on multiple VINs
RoadRec
Not enough reviews yet to summarise bugs or requests.
In-app purchases
OTR Diagnostics
No in-app purchases
RoadRec
No in-app purchases









