TeraScreen connects straight to your car and shows speed, battery and range in real time. No servers in between, no sign-in.
iOS 17+ · Android 8.0+ | Requires a car that supports phone key
Features
Restraint is the point. Everything on screen earned its place.
Ring and large numerals update together. Switch between km/h and mph anytime.
Battery percentage and estimated range left, kilometre by kilometre.
P · R · N · D highlights instantly — readable at a glance.
See what's playing, with previous, play/pause and next.
Every trip is detected automatically, with km per %, projected full-charge range and efficiency trends.
Live traffic for the Hsuehshan, Pengshan and Baguashan tunnels in Taiwan, matched to your direction of travel.
Taiwan onlyLeave the app and your speed keeps floating in a small window.
Subscription or ad unlockOne big dial in portrait, a three-column layout in landscape — it rearranges as you turn the phone.
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Pairing
Once paired, it reconnects on its own every time you get in.
The app finds your car and connects on its own — nothing else to configure.
Tap your Tesla key card on the centre console to authorise this phone as a key.
Come within range and it's connected — open the app and the gauge is already there.
Privacy
All communication with the car runs over Bluetooth and never touches our servers. Here's the full picture.
No Tesla account, and no third-party account either.
Speed, battery and gear are read directly over Bluetooth — no server relay.
Encryption keys live in the iOS Keychain or Android Keystore and never leave the device.
Location is used for Bluetooth scanning and to work out your tunnel direction. It is never uploaded or stored.
Ads and crash reporting are handled by Google AdMob and Firebase under their own privacy policies, which may collect an advertising identifier and diagnostic data. Read the full privacy policy →
Pricing
No trial period, no gauge features held back.