Comparison

OTR Diagnostics vs Fuelman Maintenance

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

OTR Diagnostics

This diagnostic tool helps heavy-duty truck owners understand and resolve fault codes, perform crucial maintenance tasks like regens, and monitor live engine data. It aims to reduce downtime and avoid costly dealer visits by empowering users with detailed insights and control over their vehicle's systems.

Highlights
  • Reset active and inactive fault codes
  • Perform forced DPF/SCR regens
  • Understand fault codes in plain language
  • Monitor live engine data
  • Track fault code history
  • Bi-directional commands for repairs
Features
Read full description

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.

About

Fuelman Maintenance

Manage your fleet's maintenance and service history in one place. Schedule repairs at over 27,000 shops nationwide and access fleet card information. Fleet managers can add vehicles and drivers, while drivers can access essential tools for vehicle upkeep.

Highlights
  • Schedule repairs at 27,000+ shops
  • View fleet card
  • Add/enroll drivers
  • Assign vehicles to drivers
  • View fleet health reports
  • Access service history
Features
Read full description

Fuelman Maintenance is the ultimate app for fleet managers and drivers. With this app, you can track all your fleet's maintenance in one place, schedule service, and view service history. Fleet managers can easily add vehicles and enroll drivers, while drivers can access their fleet card and other valuable tools to maintain their vehicle. Fuelman Maintenance gives you access to more than 40 National Brands and over 27,000 shops to service your vehicle. Whether you need an oil change, tire rotation, or something more complex, this app has you covered. Fuelman Maintenance offers new features to manage your fleet entirely from the app. Fleet admins can select from which fleet to manage, add a driver to a fleet, assign a vehicle to a driver, and view fleet health reports on the dashboard. Experience the convenience of managing your fleet's maintenance all in one place with Fuelman Maintenance. Download the app today and keep your fleet running smoothly! Key Features: • Book repair/maintenance at any of 27,000+ shops • View fleet card (used in shop to save) • Select from which fleet to manage (fleet admins only) • Add/enroll a driver to a fleet • Assign a vehicle to a driver • View fleet health at a glance • View previous service records (service history) *Login via your Fuelman Driven app (auto login) or with your existing Fuelman Maintenance Account (this is different from your Fuelman Fuel card login)

Screenshots

OTR Diagnostics4 screens
Fuelman Maintenance4 screens

Verdict

The call

The clearest difference is review sentiment: Fuelman Maintenance at 100% against OTR Diagnostics's 55%. Fuelman Maintenance also leads on iOS requirement (15.1 vs 17.6). OTR Diagnostics's advantage is rating (4.0 vs 3.0) and ratings volume (99 vs 2). On price, ads, in-app purchases and monetization model 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

OTR Diagnostics holds the better App Store score, 4.0 against 3.0. That said, the two scores are not equally well evidenced: OTR Diagnostics has 99 ratings behind it against 2, so its average is the more settled of the two. Written reviews complicate that: 55% of OTR Diagnostics's written reviews are positive against 100% of Fuelman Maintenance's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

OTR Diagnostics ships an update fortnightly, Fuelman Maintenance every 2 months. The most recent releases landed on October 29, 2026 and October 21, 2026 respectively.

Scorecard5 real differences · 5 level
OTR Diagnostics versus Fuelman Maintenance: the parameters behind the verdict, then further details
ParameterOTR DiagnosticsFuelman Maintenance
PriceFreeFree
Rating4.0 (99 ratings) — better3.0 (2 ratings)
Positive reviews55.2% of reviews100.0% of reviews — better
Number of ratings99 — better2
Update frequencyFortnightly — betterEvery 2 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPadiPhone, iPod
Requires iOS17.615.1 — better
Further details — not scored
Size268 MB67 MB
Age rating4+4+
DeveloperOTR PerformanceCarAdvise LLC

Customer experience

OTR Diagnostics

All ratings99 ratings
Positive70.7%
Neutral7.1%
Negative22.2%
Written reviews58 reviews
Positive55.2%
Neutral10.3%
Negative34.5%

Fuelman Maintenance

All ratings2 ratings
Positive50.0%
Neutral0.0%
Negative50.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

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
Show 5 more
  • 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

Fuelman Maintenance

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

OTR Diagnostics

No in-app purchases

None

Fuelman Maintenance

No in-app purchases

Questions

Is OTR Diagnostics free?
OTR Diagnostics is free to download, with no in-app purchases.
Is Fuelman Maintenance free?
Fuelman Maintenance is free to download, with no in-app purchases.
Which has better reviews, OTR Diagnostics or Fuelman Maintenance?
OTR Diagnostics is rated higher. OTR Diagnostics averages 4.0 out of 5 from 99 ratings, while Fuelman Maintenance averages 3.0 from 2 ratings.
Do OTR Diagnostics or Fuelman Maintenance have ads?
Neither OTR Diagnostics nor Fuelman Maintenance shows ads.
Which is updated more often, OTR Diagnostics or Fuelman Maintenance?
OTR Diagnostics ships an update fortnightly, and Fuelman Maintenance every 2 months. Most recently, OTR Diagnostics was updated on October 29, 2026 and Fuelman Maintenance on October 21, 2026.

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