Auto Agent vs OTR Diagnostics
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Auto Agent
Monitor, diagnose, and update your vehicle's software remotely. This powerful tool allows you to view live data, read and clear diagnostic codes, and record data for your technician. Connect directly with your mechanic for remote assistance and software updates, saving you trips to the repair shop.
- Display live vehicle data
- Read and clear diagnostic trouble codes
- Create and playback data recordings
- Send data recordings to technician
- Remote technician assistance
- Install vehicle software updates
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The EZ LYNK Auto Agent combines function and convenience, revolutionizing the way you monitor, diagnose, and update your vehicle's software. Carry the automobile industry's most powerful tool in your pocket. - Display your vehicle's live data - Read and clear Diagnostic trouble codes - Create data recordings that can be played back at your convenience - Send data recordings to your chosen technician - Connect your technician to your automobile for remote assistance - Save yourself trips to your repair facility by allowing your technician to access your vehicle's data port - Install vehicle software updates sent directly to you from your chosen technician
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.
Screenshots
Verdict
The clearest difference is rating: Auto Agent at 4.9 against OTR Diagnostics's 4.0. Auto Agent also leads on ratings volume (34K vs 99) and review sentiment (75% vs 55%). OTR Diagnostics's advantage is in-app purchases (none vs 6) and update cadence (fortnightly vs every 3 months). On price, ads, monetization model 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. Auto Agent sells 6 one-off in-app purchases. OTR Diagnostics asks for nothing beyond the download.
Auto Agent holds the better App Store score, 4.9 against 4.0. That said, the two scores are not equally well evidenced: Auto Agent has 34K ratings behind it against 99, so its average is the more settled of the two. Written reviews point the same way: 75% of Auto Agent's written reviews are positive against 55% of OTR Diagnostics's.
Auto Agent ships an update every 3 months, OTR Diagnostics fortnightly. The most recent releases landed on September 24, 2026 and September 23, 2026 respectively.
| Parameter | Auto Agent | OTR Diagnostics |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (34K ratings) — better | 4.0 (99 ratings) |
| Positive reviews | 74.6% of reviews — better | 55.2% of reviews |
| Number of ratings | 34K — better | 99 |
| Update frequency | Every 3 months | Fortnightly — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 52 MB | 266 MB |
| Age rating | 4+ | 4+ |
| Developer | EZ LYNK | OTR Performance |
Customer experience
Auto Agent
OTR Diagnostics
User reviews
Auto Agent
From 34K App Store ratingsWhat we love
- 🚀 Great monitoring tool
- 🔧 Useful for tuning and diagnostics
- 👍 Easy to use and navigate
- 💯 Excellent customer service
- 🔋 Improved fuel economy
Room to improve
- 🐛 Connection issues
- 🤔 Lacking some customization options
- 🔌 Compatibility problems with updates
- 📵 No native CarPlay support
- 🤷♂️ Unreliable tune updates
OTR Diagnostics
From 99 App Store ratingsWhat we love
- 💰 Saves money on repairs
- 🛠️ Clears fault codes
- 🔄 Performs forced regens
- ✅ Works with various engines
- 👍 Easy to use
Room to improve
- 💸 Overpriced
- 🐛 Buggy and unstable app
- 🔌 Frequent Bluetooth disconnects
- 📉 Updates cause problems
- ❌ Some features disappeared after updates
Bugs and requests
Auto Agent
Reported bugs
5 issues- App crashes and freezes
- Disconnection issues with the device
- Tune files disappearing or becoming inaccessible
- Compatibility problems with iOS 14 updates
- Unreliable Wi-Fi connectivity
Requested features
5 requests- Native support for Apple CarPlay
- More customization options for gauges and titles
- Ability to monitor more parameters
- Improved GPS speed accuracy
- Sound alerts for warning indicators
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
Show 5 moreShow fewer
- 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
In-app purchases
Auto Agent
- 1 credit$1.99
- 5 credits$9.99
- 10 credits$19.99
Show 3 moreShow fewer
- 20 credits$39.99
- 50 credits$99.99
- 100 credits$199.99
OTR Diagnostics
No in-app purchases
Questions
Is Auto Agent free?
Is OTR Diagnostics free?
Which has better reviews, Auto Agent or OTR Diagnostics?
Do Auto Agent or OTR Diagnostics have ads?
Which is updated more often, Auto Agent or OTR Diagnostics?
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