Tyre Pressure by TempTyre Pressure by Temp
Cold snap on the way? See what your tyres will read before you hit the servo.
Download on the App Store
Screenshots
Features
Today's estimate from your placard figure
Enter the pressure printed on your door placard once, along with the temperature it was set at. The app then estimates what your tyres would read at the current temperature, and roughly how much air it would take to get back to your target.
The temperature, fetched for you
The current temperature comes from your local forecast automatically, so there is nothing to type in each morning. Your coordinates are rounded before they are sent, and are never stored or shared.
A heads-up the night before
When a cold morning is coming, an optional evening notification shows you the estimate — so a frosty start doesn't catch you out in the driveway.
Every vehicle you own
Car, ute, motorbike, bicycle, campervan, trailer — add as many as you like. Front and rear axles can carry different targets, and each vehicle keeps its own unit: kPa, psi or bar.
Home Screen widget
Small and Medium widgets show the morning estimate without opening the app. A glance on the way out the door is usually enough.
The "what if" slider
Drag the temperature slider to see the estimate at 0 °C, or at 35 °C. Handy before heading somewhere much colder than home — a high-country run, say.
No sensors, no hardware
Nothing to buy, fit or pair. No valve sensors, no Bluetooth. Just the figure from your placard and the temperature outside.
The maths is shown, not hidden
The estimate uses the ideal gas law at constant volume, converting gauge pressure to absolute pressure before applying the ratio. The settings screen shows the formula so you can check the working yourself.
One purchase, everything on your device
A single purchase — no subscription, no in-app purchases, no ads. No account to create, no tracking, and your vehicles never leave your iPhone.
Tyre pressure falls as the air gets colder. Enter the pressure printed on your door placard once, along with the temperature it was set at, and this app estimates what your tyres would read at today's temperature — and roughly how much air it would take to get back to the placard figure.
No sensors. No Bluetooth. Nothing to buy or fit.
Every other tyre pressure app expects you to install hardware on your valves. This one is simply arithmetic done carefully, using the temperature outside your window.
WHAT IT DOES
• Estimates today's pressure from your placard setting and the current temperature
• Shows the top-up estimate — how much to add to reach your target
• Picks up the current temperature automatically from your local forecast
• Warns you the night before a cold morning, so a frosty start isn't a surprise
• Temperature slider to explore "what if it drops to 0°C?"
• Home Screen widget shows the morning estimate without opening the app
BUILT FOR EVERY VEHICLE YOU OWN
Add as many as you like: car, motorbike, bicycle, campervan or trailer. Front and rear axles can carry different targets, and each vehicle keeps its own unit — because placards are printed in kPa here and psi or bar elsewhere.
• bar, psi and kPa, switchable per vehicle
• Separate front and rear targets
• Your vehicles stay on your device
THE MATHS, IN THE OPEN
The estimate is the ideal gas law at constant volume. The step most rules of thumb skip is converting gauge pressure to absolute pressure before applying the ratio, then converting back. Skipping it overstates the change by roughly 40 per cent. This app does the conversion, and the settings screen shows you the formula so you can check the working yourself.
PLEASE READ
Every figure here is an estimate meant to help you decide when to visit the servo. It is not a measurement and not a replacement for one.
• Your vehicle's door placard is the authority on target pressure
• Check with a gauge before adjusting anything
• Pressure readings only compare properly on cold tyres — parked three hours or more, before driving. Driving heats tyres and raises the reading
• Your phone measures nothing; the app cannot see your actual tyres
PRIVACY
Your location is used only to look up the temperature nearby, rounded before it is sent, and never stored or shared. Your vehicles stay on your device.
ONE PURCHASE
Buy it once and everything is included. No subscription, no in-app purchases, no ads.