WCSPermits vs OTR Diagnostics
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Oversize load permit attachments
- US and Canadian province coverage
- Email and print document options
- Direct connection to pilot car services
- Online equipment store access
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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.
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 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
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.
WCSPermits ships an update every 3 months, OTR Diagnostics fortnightly. The most recent releases landed on June 5, 2026 and September 23, 2026 respectively.
| Parameter | WCSPermits | OTR Diagnostics |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (6 ratings) — better | 4.0 (99 ratings) |
| Positive reviews | 100.0% of reviews — better | 55.2% of reviews |
| Number of ratings | 6 | 99 — better |
| Update frequency | Every 3 months | Fortnightly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 11.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 43 MB | 266 MB |
| Age rating | 4+ | 4+ |
| Developer | WCS Permits | OTR Performance |
Customer experience
WCSPermits
OTR Diagnostics
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
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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
In-app purchases
WCSPermits
No in-app purchases
OTR Diagnostics
No in-app purchases
Questions
Is WCSPermits free?
Is OTR Diagnostics free?
Which has better reviews, WCSPermits or OTR Diagnostics?
Do WCSPermits or OTR Diagnostics have ads?
Which is updated more often, WCSPermits or OTR Diagnostics?
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