CANviz

Open-source, browser-based CAN bus analyzer — pip install, works with any USB CAN adapter

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An open-source, browser-based CAN bus analyzer that installs with pip and runs with any USB CAN adapter, including low-cost devices, without extra GUI installs, drivers, or accounts. It shows live frames, decoded DBC signals, plots, transmit and record/replay capabilities, and provides J1939/CANopen support plus a CLI/headless mode, aimed at embedded, automotive, robotics, and heavy-vehicle engineers; not suitable for reliable error-frame capture on slcan firmware.

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