You stay responsible.
Watch the road. Be ready to steer and brake. Driver assistance can make mistakes.
New to comma?
Comma AI for Dummies · Beginner guide
Your first comma. Start here.
No technical background needed. Just a clear path from “what is this?” to knowing your next step.
A quick answer before you dive in.
comma adds driver assistance to specific supported cars. It does not turn your car into a self-driving car.
Your car sets the limits.
Steering, speed control, required parts, and supported years vary by configuration.
Start with the basics.
Understand standard openpilot before choosing optional hardware or community software.
From curious to prepared
Six steps. In the right order.
Understand what you are buying.
comma four is the hardware. openpilot is the driver-assistance software. It can help with steering and speed on supported cars, with limits.
Check your exact car.
Match the model, year, and required equipment. Similar names or neighboring model years do not establish support.
Build the right shopping list.
Start with a compatible device and the car-specific harness. Read the car listing for any additional parts, then confirm the current checkout contents.
Decide whether you need the extras.
Chestnut is optional for comma four. It adds hardware to run a larger model; it is not required for standard openpilot.
Set up while parked.
Follow the official mounting and car connection instructions. Then use the checked software guide for your device and chosen release.
Learn the controls before your first drive.
Read the warnings, complete calibration, and understand how to disengage. Keep watching the road and stay ready to take over immediately.
Before you pay
Budget for your whole setup.
Check the current device price, harness selection, and any extra parts listed for your car. Add shipping and taxes where applicable.
Do not assume an optional Chestnut kit or subscription is included. Review those separately if you want them.
See the official product contentsGood questions. Clear answers.
Do I need to know how to code?
The standard setup uses guided device installation. You still need to follow the instructions for your exact car, hardware, and software.
What is a harness?
A harness is the car-specific cable assembly used to connect the device. Choose the one listed for your exact car configuration.
What is a fork?
A fork is a community version of openpilot with its own features, support, and installation instructions. It is a separate software choice.
Can I copy someone else’s setup?
Only after checking that the exact car, year, equipment, device, and software match. A video is not a compatibility check.
Car checked? Ready to choose?
A good start comes with the right fit.
Check the exact car requirements first. Then see the current comma four offer and the correct harness at comma.ai.
Referral disclosure: eligible new customers get $50 off. CommaGuide gets $50 after a qualifying purchase. Terms apply.
Your next step
Keep it simple.
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