Comparison

WCSPermits vs OTR Diagnostics

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

Head to head
About

WCSPermits

Access essential oversize load permit attachments and related documents for the US and Canada. This app also connects you to pilot car services, permit information, and an online store for safety equipment.

Highlights
  • Oversize load permit attachments
  • US and Canadian province coverage
  • Email and print document options
  • Direct connection to pilot car services
  • Online equipment store access
Features
Read full description

WCS Permits & Pilot Cars Permit Attachments app provides oversize load permit attachments and other necessary documents for the United States & Canadian Provinces. All documents are available to send by email or print when necessary. The App also directly connects you to other services you may need such as pilot cars, permits and our online equipment store where you can buy oversize load banners, high poles, safety apparel and more. Download for the road and have all the information you need in one place.

About

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.

Highlights
  • 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
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.

Screenshots

WCSPermits4 screens
OTR Diagnostics4 screens

Verdict

The call

The clearest difference is review sentiment: WCSPermits at 100% against OTR Diagnostics's 55%. WCSPermits also leads on rating (5.0 vs 4.0) and monetization model (free vs free with in-app purchases). OTR Diagnostics's advantage is update cadence (fortnightly vs every 3 months) and ratings volume (99 vs 6). 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

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

WCSPermits holds the better App Store score, 5.0 against 4.0. That said, the two scores are not equally well evidenced: OTR Diagnostics has 99 ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 100% of WCSPermits's written reviews are positive against 55% of OTR Diagnostics's.

UpkeepUpdate frequency

WCSPermits ships an update every 3 months, OTR Diagnostics fortnightly. The most recent releases landed on June 5, 2026 and September 23, 2026 respectively.

Scorecard6 real differences · 4 level
WCSPermits versus OTR Diagnostics: the parameters behind the verdict, then further details
ParameterWCSPermitsOTR Diagnostics
PriceFreeFree
Rating5.0 (6 ratings) — better4.0 (99 ratings)
Positive reviews100.0% of reviews — better55.2% of reviews
Number of ratings699 — better
Update frequencyEvery 3 monthsFortnightly — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS11.0 — better17.6
Further details — not scored
Size43 MB266 MB
Age rating4+4+
DeveloperWCS PermitsOTR Performance

Customer experience

WCSPermits

All ratings6 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews14 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

OTR Diagnostics

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

Bugs and requests

WCSPermits

Not enough reviews yet to summarise bugs or 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

In-app purchases

None

WCSPermits

No in-app purchases

None

OTR Diagnostics

No in-app purchases

Questions

Is WCSPermits free?
WCSPermits is free to download, with no in-app purchases.
Is OTR Diagnostics free?
OTR Diagnostics is free to download, with no in-app purchases.
Which has better reviews, WCSPermits or OTR Diagnostics?
WCSPermits is rated higher. WCSPermits averages 5.0 out of 5 from 6 ratings, while OTR Diagnostics averages 4.0 from 99 ratings.
Do WCSPermits or OTR Diagnostics have ads?
Neither WCSPermits nor OTR Diagnostics shows ads.
Which is updated more often, WCSPermits or OTR Diagnostics?
WCSPermits ships an update every 3 months, and OTR Diagnostics fortnightly. Most recently, WCSPermits was updated on June 5, 2026 and OTR Diagnostics on September 23, 2026.

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