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Webperf Core

Webperf Core is the test engine. It runs sixteen tests against a web address and scores performance, accessibility, security, privacy and standards compliance. The same engine drives the public comparisons on Webperf.se and the paid monitoring in Webperf Cloud. You can also run it yourself, for free.

  • 11 Contributors
  • 51 Forks
  • 27 Stars

Latest release 2026.7.3 on 28 July 2026. Open source under the MIT licence since December 2019, last changed 5 August 2026. The project on GitHub

The figures were fetched on 9 August 2026.

Why Webperf Core?

  • Open source. MIT licence. Every test is code you can read, question and change.
  • Sixteen tests covering performance, accessibility, security, privacy, email, DNS and code quality.
  • Run it anywhere. Locally, in Docker, or in a CI pipeline.
  • The same score everywhere. A result from your laptop is calculated exactly like a result on Webperf.se.
  • A community project since 2019. Built by volunteers, starting from Swedish conditions.

Who owns it?

Nobody. Webperf Core is a community project that started in 2019 and is built by volunteers under the MIT licence.

Webperf AB, which runs Webperf.se and Webperf Cloud, uses Core as its test engine and contributes back to the project. But the company doesn't own it and doesn't decide over it alone. If you want to change how a test works, the route is the same for you as for anyone else: contribute code, or raise it in Slack.

Who uses it?

  • Developers who want to catch problems before they ship
  • Agencies doing quality assurance on client projects
  • Organisations monitoring their own websites
  • Public sector bodies meeting accessibility obligations

How it fits together 

graph LR
    A[URL to test] --> B[Webperf Core]
    B --> C[Sitespeed.io]
    B --> D[Lighthouse]
    B --> E[Pa11y / Axe]
    B --> F[Webbkoll]
    B --> G[Zonemaster]
    B --> H[Built-in checks]
    C --> I[Score and review]
    D --> I
    E --> I
    F --> I
    G --> I
    H --> I

Webperf Core starts the specialised tools, interprets their output and converts it into a common score. Several tests share a single run of Sitespeed.io, which is why running them together is faster than running them one at a time.

Getting started

  • Quickstart

    Your first test in under five minutes.

  • Local install

    A full install on your own machine, with troubleshooting.

  • Docker

    A ready-made image with every dependency in place.

  • GitHub Actions

    Test automatically on every push.

Documentation in two levels

If you use the tool

If you develop it