See what changed between two HAR files

Understand regressions by comparing your HAR files: metrics with statistics across all runs, video, filmstrip and waterfalls on one timeline.

Drop your HAR files here

One or two .har or .har.gz files, or a saved comparison.

Choose files

The files stay in your browser. Nothing is uploaded.

Tip HAR files from sitespeed.io and Browsertime also give you visual metrics, CPU timings and more runs to compare. When the HAR links to the result (sitespeed.io with --resultBaseURL), you also get the video and filmstrip.

or

Add the URL to your HAR files and press compare:

You can also use a configuration file or a Github gist. Read the full documentation

HAR comparison

Timeline

0.000 s

Visual progress

Lines: the selected runs. Light color: from the slowest to the fastest run.

Shaded red: the two runs differ by 20 percentage points or more in visual progress.

Waterfall

All metrics

Request changes

Compare

Understand regressions by comparing your HAR files.

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