Speed you can trust
GPS speed through a Kalman filter, blended with the car's own road speed. Steady at a cruise, quick under braking, and a clean 0 when you're parked.
GPS + OBD-II fusion
## features
Everything your dashboard doesn't tell you
Your nav app handles the map. BTYSHU fills the other half of the screen with what the car knows, and a few things it never did.
## on the road
On the road
The things you glance at while driving, readable in a moment and sized to whatever half of the screen they get.
Real UK speed limit signs
The actual road-sign artwork, national speed limit roundel included. Offline across England and looked up live everywhere else, and it tells you when a road has no limit data instead of guessing.
OpenStreetMap
Speed cameras ahead
Fixed cameras, and only the ones in front of you: never the one you've just passed or the one on the other carriageway. Distance in yards, with the road it's on.
Offline · England
The road you're on
Shown next to the clock, number first, because A47 is what the sign you just passed says. It makes the speed limit easy to sanity-check too.
Offline · England
Music controls
Play, pause and skip for Spotify or whatever else is playing, without leaving the dashboard.
Any media app
Day and night from the real sunset
Switches theme at sunrise and sunset for wherever the car is, and turns the backlight down after dark.
No network needed
## under the bonnet
Under the bonnet
Plug any ELM327 Bluetooth adapter into the diagnostic port and the car starts telling you what it knows.
Live engine data
Revs, coolant, fuel level, live and trip MPG, range, and the gear you're in, worked out from the gearbox's real ratios.
ELM327 · Bluetooth LE
Warning lights
The check engine light straight from the ECU, plus warnings for overheating, a battery that isn't charging and low fuel, worked out from live readings.
OBD-II mode 01
Fault codes and MOT readiness
Stored and pending codes, with a freeze frame of what the engine was doing when each one was set. It shows which emissions checks are ready for an MOT, and warns you before clearing codes resets them.
OBD-II modes 02 · 03 · 07
Battery warnings before a flat
Live voltage, plus how far it dips while the starter turns. That dip is the best early sign of a battery on its way out.
Cranking voltage
Early warning from fuel trims
A plain-English note when fuel trim drifts. That drift is often the first sign of a vacuum leak, well before a fault code appears.
Long-term fuel trim
Ice warning
Outside temperature from the car's own sensor, with a warning from 3°C, because road surfaces freeze before the air does.
Outside temperature
## after the drive
After the drive
Every journey is logged on its own. There is nothing to remember to press.
Journeys log themselves
A journey starts above 5 mph and ends after three minutes stopped. Export the lot as CSV, ready for a mileage claim.
Automatic · CSV
Every second, on a map
Tap a journey for its route, a speed trace and a second-by-second log that all move together. Every GPS fix is kept.
Full resolution
Harsh braking and acceleration
Measured in g against standard telematics thresholds, with checks that stop a dropped GPS fix or a parked car logging false alarms.
0.30 g threshold
Cost and pence per mile
What each journey cost at your fuel price, plus pence per mile, so a motorway run and a school run compare fairly.
Your fuel price
MPG you can check
Log each fill-up and get MPG measured from real litres and real miles, alongside the live figure.
Brim to brim
Totals, reminders and where you parked
Tracked miles, litres and MPG across every journey, a countdown to your next service, and where you left the car.
Lifetime
## how it behaves
Built to stay out of your way
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Works with no signal
Speed limits, cameras, road names and journey maps come from data already on the device. Tunnels and multi-storeys don't blank the screen.
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Doesn't nag
No overspeed chime and no sound on harsh braking. It shows you the limit and your speed. What you do about it is up to you.
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Only shows what it knows
A missing reading never lights a warning, and a fault code is never given a made-up explanation. When the dashboard tells you something, it's real.
Put it on your dash.
Install it from Google Play, pair whatever adapter you've got, and drive.