Razorline: OBD GPS Lap Timer

Federico Gusmeroli

In-app purchases

About this app

Turn every track session into clear, actionable data. Razorline combines a GPS lap timer, optional OBD2 car telemetry and a customizable racing HUD so you can measure laps, compare sectors and understand where you gain or lose time.

TIME EVERY LAP WITH GPS
Create or record a circuit, set the start/finish line and add sectors. Follow live lap time, sector splits, delta to your best lap and theoretical best performance. Use the ghost lap on the map as a visual reference for your next run.

DRIVE WITH OR WITHOUT OBD2
Razorline works with your phone's GPS and motion sensors, so an OBD adapter is not required. Connect a compatible Bluetooth ELM327 OBD-II adapter to add supported vehicle data such as RPM, throttle position, coolant temperature and vehicle speed. Available channels depend on your car and adapter.

BUILD A HUD THAT FITS YOU
Customize a clear motorsport-style dashboard with speed, RPM, G-force, current lap, best lap, sector data, route guidance and other live information.

RECORD, REVIEW AND IMPROVE
• GPS lap timer with start/finish and sector timing
• Live delta, best lap and theoretical best
• Ghost lap comparison on the map
• Circuit and route creator with saved timing lines
• Route recording and GPX import
• Detailed session history with lap and sector times
• Speed traces, G-force and OBD telemetry charts
• OBD diagnostics for compatible trouble codes
• Vehicle profiles, tyre mileage and maintenance tracking
• CSV and GPX export for your own analysis
• Shareable routes and lap challenges
• Tour mode for reviewing permitted road trips

BUILT FOR FOCUSED DRIVING
Set up the session before moving and use the large, configurable HUD at a glance. Razorline keeps timing, routes and telemetry together without unnecessary clutter.

Razorline is intended for closed circuits, track days, private roads and controlled environments. Route tools may also be used on public roads where permitted. Always obey local laws, drive safely and never interact with your phone while driving. GPS and OBD accuracy depend on the device, vehicle, adapter and conditions.