OBD2 Log Viewer& Diagnostic
User guide

Using OBD2 Log Viewer

Open a vehicle log from your device, inspect charts in the browser, and print a PDF when you need one. The measurement file stays on your computer.

Diagnostic text is a recommendation only. Confirm with a qualified technician before any repair.

Get started

  1. Open the app from Try in browser (or Open app after you log in).
  2. Choose Use Log A and select the file on your device.
  3. Tick channels you want to see. Charts and summaries update on their own.

A registered Free account includes a 14-day trial. After that, upgrade to a paid plan. Plans are listed on Pricing.

What you will see

  • Header — load files, PDF report, language, units, account.
  • Channels — pick which signals appear on the charts.
  • Trip and engine summaries — a short overview of the session when the log has the data.

Log A, Log B, Eject

Use Log A is the main measurement. Use Log B adds a second file for comparison on PRO and above. Eject clears loaded files from the view. Saved views (presets) need an open log.

Your files stay local

You pick the file on your device. Analysis runs in your browser. The raw log is not uploaded with your account. See Local-first privacy for more.

Hybrid / PHEV view

If the opened log contains usable high-voltage battery signals, the header can show a Hybrid badge. Open Hybrid for SOC and HV charts plus an EV/regen overview. Foundations are ready today; deeper Hybrid analysis is under continuous development. Pure ICE logs without HV signals do not show Hybrid.

Plans in short

  • Free — basic viewing, limited charts and a watermark on PDF. Registered: 14-day trial.
  • Hobby — more charts, no Free watermark. One-time purchase.
  • PRO — compare two logs, deeper analysis, saved views. Yearly.
  • PRO Plus+ — everything in PRO plus Track & Drive (laps, driving, map). Yearly.
  • Expert — everything in Plus plus workshop fields (customer, vehicle, project) and branded PDF. Yearly.

Buttons you do not have on your plan are locked or hidden on purpose.

Track & Drive

On PRO Plus+ and Expert, Track & Drive opens a dedicated view for laps, driving behaviour and map when the log includes location data. Back to log returns to the normal layout. You can still create a PDF from that view.

PDF report

PDF report in the header opens your browser print dialog. The report can include summaries, charts and extra sections for your plan. Free reports include a watermark and fewer charts.

If something looks wrong

  • Eject, then load the file again, or try another datalog.
  • Refresh the page. Check that your plan includes that feature.
  • Suggestions never replace a workshop inspection.