Driver
Know in seconds whether you can keep rolling or need to stop.
DERATE
Snap the fault code. Know what it is, how urgent it is and what it'll cost.
The app for truck drivers, operators and owner-operators
Available on the
App Store
Get it on
Google Play
Coming soon
How it works
- 1
Snap the dashboard or scanner
- 2
DERATE reads the SPN/FMI code
- 3
Know what it is, how urgent it is and what it costs, with a report for your mechanic
See it on a real truck
Recorded in the cab, diagnosis unedited.
See the app
Start with a photo
Frame the dash
Clear verdict and urgency
The part and its price
Tech view: causes, tests and repair
Shop mode with work order
SPN/FMI codes explained
Who it's for
Operator
Arrive at the shop with the diagnosis and estimated cost in hand.
Owner-operator
Avoid unnecessary repairs and downtime that cost you money.
Pricing
Free download. One-time $19.99 Rescue diagnosis or monthly plan with a 7-day free trial.
Available on the
App Store
Get it on
Google Play
Coming soon
FAQ
Do I need a scanner?
No. A photo of the dashboard is enough; if you have a scanner, you can also snap its screen.
Does it work in Spanish?
Yes. DERATE works fully in English and Spanish.
Which trucks does it support?
Heavy-duty trucks: Freightliner, Kenworth, Peterbilt, International, Volvo and Mack, with Cummins, Detroit and PACCAR engines.
Does it replace my mechanic?
No. It prepares you before the shop so you know what to ask for and what to expect to pay.
Ask DERATE
Fault code library
What each diesel truck SPN/FMI code means, its most likely cause and the test that confirms it. Free.
Download now
Available on the
App Store
Get it on
Google Play
Coming soon