SeerWatch Quick Start

The fastest way to get started and try out SeerWatch is the browser based CAN Analyzer. With it you can:

  • Load CAN log files instantly
  • Decode signals using standard DBC files
  • Plot and compare multiple signals
  • Filter CAN frames by data fields

All directly from your browser on any OS.

If you need live CAN bus monitoring download the native application. It adds

  • Live message monitoring
  • Log recording with optional filters
  • Real time signal plotting

Watch the Overview

A 2-minute walkthrough of SeerWatch’s core features.

Try it Yourself

Getting started takes less than a minute – Try the demo with pre-loaded data or bring your own!

Try SeerWatch

How to Analyze CAN Bus Logs with SeerWatch

1. Viewing CAN Logs

message trace example

Open SeerWatch and load your CAN log file. Click Load Logs and select a .log or .asc file using the file navigator.

Supported CAN log formats:

  • candump .log files
  • Vector .asc files

Once loaded, you’ll see every CAN frame from your log in a scrollable message table with timestamps, arbitration IDs, and raw data bytes. Your data loads fast and SeerWatch handles large log files with thousands of CAN frames smoothly.

2. Decoding Signals with a DBC File

DBC decoding applies signal scaling, offset, byte order, and unit labels automatically. Load a DBC database file and SeerWatch transforms raw CAN bytes into real signal values.

So instead of staring at `0x3A 0x7F 0x00 0x12`, you’ll see:

  • Vehicle_Speed: 58.5 km/h
  • Engine_RPM: 3200 RPM
  • Coolant_Temp: 87 degC

raw can frames
decoded can frames

3. Plotting Signals Over Time

SeerWatch adds any decoded signal to the Available Signals section in Plots.

Click any decoded signal to plot it on a time-series chart.

  • Overlay multiple signals — compare vehicle speed and engine RPM on the same chart
  • Zoom and pan — drill into specific time ranges to inspect events
  • Responsive rendering — plots stay smooth even with large datasets thanks to intelligent downsampling

With plots you can spot anomalies, correlate events, and understand your CAN bus data at a glance.

plotting multiple CAN signal

Frequently Asked Questions

What CAN log formats does SeerWatch support?

SeerWatch currently loads candump .log files and Vector .asc files. Need a different format? Reach out and let us know what you use.

Do I need to install anything?

No. The log analyzer runs entirely in your browser.

Want a native application? Stay updated to get informed when a native desktop app for macOS or Windows is available for download.

Is my data uploaded to a server?

No. Your log files and DBC files never leave your machine. When you use the web analyzer your browser runs the application in a web assembly sandbox and all files stay contained within your browser. We don’t see the files you load.

What is a DBC file?

A DBC (Database CAN) file defines how raw CAN message bytes map to named signals with units and scaling. It’s the standard format used across the automotive industry for CAN signal decoding. If your hardware vendor or OEM provided a DBC, you can load it directly into SeerWatch.

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