KaiLauncher
Kai Home
Car display
A home launcher in place of the stock screen, with navigation, music, climate and cameras on one screen.
Public beta · No sign-up needed
Your car's screen,
Your car's screen,
lit up.
Kai is three apps for the SEALION 7: Kai Home on the car display, Kai Link on your phone and Kai Watch on your wrist.
A personal project, not an official BYD app · Android 11 or later
Themes
A home screen for every season.
Twelve themes change the background and the card colours together. Snow, petals and leaves really move, and the train, subway and bus themes run with your car's speed and pull into a station or stop when you stop.
Screens
A look around
Instrument cluster designs
Pick a speedometer design for the cluster, or fill the cluster with your navigation map.
All screens are drawn by the real app code. They were drawn without a car, so some values such as the battery are empty or show ‘not received’.
Three apps, one car
Car, phone and watch, as one.
Install only on the devices you need. Used together, they connect to each other.
Kai Link
Android phone
Check your car, lock and run the climate remotely, unlock as you walk up, and watch dashcam recordings.
W
Kai Watch
Galaxy Watch (Wear OS)
See the battery, lock state and climate on your wrist, and control them right there.
Features
What can it do?
The features you use most, easy to reach. What works depends on your car's firmware and permissions.
Everyday features on the home screen
- Navigation and appsOpen your navigation app and car menus straight from home, and show the map on the cluster.
- Bluetooth musicShows what's playing from the car and from your connected phone.
- A screen that suits youChange the orientation and layout and set Kai as the default home (if your car allows it).
Climate and seats in one place
- Temperature and airflowDriver and passenger temperature, fan speed and airflow direction.
- Heating and ventilationSeat heating and ventilation and the heated steering wheel, right on the climate screen.
- Climate settingsAUTO, A/C, recirculation, defrost and the other functions your car supports.
Cameras and recording
- Camera viewsConnect the supported cameras, match screens and channels, and drag to adjust the angle.
- Recording and saved videosSet up dashcam and parking recording and review saved videos.
- Check from your phoneNeeds car power, a network and camera permission. Recording with the car switched off is not guaranteed yet.
Your car on your phone and wrist
- Unlocks as you arrive, locks as you leaveUses your car's Bluetooth signal and step detection to tell when you approach or walk away. Needs activity and Bluetooth permissions.
- Remote control and refreshLock, open the boot and run the climate remotely; pull down on the home screen to refresh the car status.
- Settings keptUpdate without uninstalling and your account and auto-lock settings stay.
Get ready
Set up in three steps.
Choose a device and follow the steps.
Get the file
Download the Kai Home APK and copy it to a USB stick or somewhere the car can open.
Allow and install
Open the APK in the car's file manager and allow installation when asked.
Check the connection
The first launch opens a setup guide. Check permissions and the connection, then choose Kai as the home app.
Get the file
Download the Kai Link APK on your Android phone. There is no iPhone app.
Allow the install
Open the file and allow ‘install unknown apps’ for your browser or file manager.
Add your car
Link your BYD account to add the car, and allow activity, Bluetooth, nearby devices and background use.
Set up Kai Link on the phone
The watch talks to the car through Kai Link on your phone, so finish the phone setup first.
Send the APK to the watch
Turn on wireless debugging in the watch's developer options and install the Kai Watch APK with an installer app on your phone.
Pair the watch
Open ‘Galaxy Watch’ in Kai Link on the phone and follow the steps.
After that, the app tells you about updates.
The car and phone apps check for new versions when they start, verify the file's signature and open Android's installer. Update instead of uninstalling to keep your settings.
Before you start
Frequently asked questions
Which cars and phones does it work with?
It is built for the SEALION 7's Android car display and needs Android 11 or later. What works depends on the car's firmware and permissions. Kai Link is for Android phones only.
Can it replace the stock launcher as the default home?
Your car has to allow changing the default home app. Kai can try to set and keep itself as the default, but the car's firmware may not allow it.
Do the cameras and parking recording work with the car off?
The cameras, the head unit and the network must stay powered and the car must grant the permissions. Recording and remote video with the car off are not guaranteed yet.
What about parking-sensor distances and the lead-car departure alert?
The car has to send the distances and the departure signal. Without them, Kai never makes up distances or alerts.
Are my settings kept after an update?
Yes, if you update without uninstalling. Uninstalling or clearing the app's data means setting up again.
Do I need an account, and do you collect my data?
No sign-up is needed to download. This site has no ads or visitor tracking. The Q&A board stores only the name you give (optional) and your question. Features that need your car account are connected inside the app. See the privacy notice (Korean) for details.
Can't find your answer? Ask the developer News on Telegram
Download
Where will you install it?
Pick the app for your device. All free.
FOR YOUR CAR
Kai Home
Home launcher for the car
- Version
- —
- Size
- —
- Requires
- Android 11+
FOR YOUR PHONE
Kai Link
Android phone app
- Version
- —
- Size
- —
- Requires
- Android 11+
Kai Watch
Galaxy Watch (Wear OS) app
- Version
- —
- Size
- —
- Requires
- Wear OS Galaxy Watch
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Support Kai
Kai is made for free by one person in their spare time. The price of a coffee goes a long way toward the next update.