About
openpilot is comma.ai's flagship open-source advanced driver assistance system (ADAS) that transforms your existing vehicle into a semi-autonomous driving experience. Powered by AI and computer vision, it handles the cognitive load of highway driving by providing continuous lane centering, adaptive cruise control, automated lane changes, and 360° camera-based vision — all from a single plug-in device called the comma four. Designed for drivers who want a meaningful upgrade without buying a new car, openpilot is compatible with over 325 vehicle models across 27 brands, including Toyota, Hyundai, Kia, Lexus, Ford, and more. The system is entirely open-source with over 50,000 GitHub stars, making it highly transparent and community-driven. Over-the-air (OTA) updates ensure the system continuously improves without user intervention. With more than 300 million miles driven by 20,000+ active users, openpilot has a proven track record of real-world performance. The companion app, comma connect, provides cloud-connected dashcam footage, trip logs, and remote vehicle monitoring. openpilot is ideal for daily commuters looking to reduce driving fatigue, tech enthusiasts interested in open-source automotive AI, and developers who want to contribute to or build on a production-grade self-driving software stack. The comma four hardware device is required to run openpilot and is available through comma.ai's online shop.
Key Features
- Lane Centering & Adaptive Cruise: Automatically keeps the vehicle centered in the lane and maintains a safe following distance from the car ahead, reducing driver fatigue on highways.
- Automated Lane Changing: Enables hands-free lane changes by detecting surrounding traffic and safely merging into adjacent lanes when prompted.
- 360° Vision & Dashcam Recording: The comma four device uses wide-angle cameras to provide surround-view awareness and automatically records trips as dashcam footage accessible via comma connect.
- Over-the-Air (OTA) Updates: openpilot receives continuous software improvements pushed wirelessly to the device, ensuring users always have the latest safety and feature enhancements.
- Broad Vehicle Compatibility: Supports 325+ car models from 27 brands including Toyota, Hyundai, Kia, Lexus, Ford, and more — working with the car you already own.
Use Cases
- Reducing driver fatigue during long highway commutes by enabling hands-free lane centering and adaptive cruise control.
- Upgrading an existing vehicle with semi-autonomous driving capabilities without purchasing a new car.
- Recording continuous dashcam footage for safety, insurance purposes, or trip documentation via comma connect.
- Contributing to or building on an open-source autonomous driving stack as an automotive developer or AI researcher.
- Monitoring and reviewing driving behavior and trip data remotely through the cloud-connected comma connect platform.
Pros
- Massive Vehicle Compatibility: Works with 325+ cars across 27 brands, making it accessible to a wide range of car owners without requiring a new vehicle purchase.
- Fully Open-Source: With 50,000+ GitHub stars and a thriving community, openpilot is transparent, auditable, and continuously improved by contributors worldwide.
- Proven Real-World Track Record: Over 300 million miles driven by 20,000+ users validates openpilot as a reliable and battle-tested driver assistance platform.
- Simple Plug-and-Play Setup: The comma four device connects easily to your car's OBD-II port or existing camera harness, requiring no complex installation or mechanical modification.
Cons
- Requires Hardware Purchase: To run openpilot, users must purchase the comma four device, adding an upfront hardware cost on top of the free software.
- Limited to Supported Vehicles: Despite supporting 325+ models, many car makes and older model years are not yet compatible, excluding a large portion of drivers.
- Active Supervision Still Required: openpilot is an ADAS system, not full self-driving — drivers must remain attentive and keep hands ready to take over at all times.
Frequently Asked Questions
What is openpilot?
openpilot is an open-source advanced driver assistance system (ADAS) developed by comma.ai. It provides features like lane centering, adaptive cruise control, automated lane changing, and dashcam recording for compatible vehicles using the comma four hardware device.
Which cars are compatible with openpilot?
openpilot currently supports 325+ car models from 27 brands including Toyota, Hyundai, Kia, Lexus, Ford, Honda, and more. You can check your specific car's compatibility on the comma.ai website.
Is openpilot safe to use?
openpilot has accumulated over 300 million miles of real-world driving data across 20,000+ users, demonstrating strong real-world reliability. However, it is an ADAS system — not full autonomy — and drivers are always required to stay alert and supervise the system.
How does the comma four device work?
The comma four plugs into your car's existing port (OBD-II or camera harness), connects to the vehicle's CAN bus to read and send driving commands, and uses onboard cameras and AI to manage lane centering, speed control, and vision — all without modifying your car permanently.
Is openpilot free?
The openpilot software is completely free and open-source, available on GitHub. However, the comma four hardware device required to run it on a vehicle is a paid product sold through the comma.ai shop.
