sitespeed.io review
A self-hosted option for scripted browser tests, CI budgets, and detailed diagnostics.
Reviewed by iTechGuides Editors · Editorial team · Updated Nov 2026
sitespeed.io is an open-source website performance testing tool for developers and teams that want synthetic browser checks in their development workflow. It runs on Linux, macOS, and Windows, and tests with real browsers including Chrome, Firefox, Edge, and Safari. Its reports cover Core Web Vitals such as LCP, INP, and CLS, alongside visual metrics, video recordings, HAR waterfalls, CPU activity, and long tasks. That combination makes it a fit for teams investigating page performance and preventing regressions before release.
CI integration and diagnostics are central to the product. Teams can run tests from a terminal, script user journeys, test multiple URLs, and set performance budgets that fail builds when limits are exceeded. Integrations include Jenkins, CircleCI, GitLab CI, and GitHub Actions. For analysis beyond the test run, metrics can be exported to Graphite or InfluxDB and visualized in Grafana; PagerDuty and Slack are also listed among its integrations. The tool can retrieve Chrome User Experience Report data, but its monitoring approach is synthetic rather than an installed agent collecting visitor data. Choose it when repeatable real-browser checks and build gates matter more than direct real-user monitoring.
The software itself is free, with no paid plan tier described. The tradeoff is operational: deployment is self-hosted, so teams provide the compute and storage for test results and maintain the environment that runs scheduled checks. Documentation and community support are the listed support channels. This model suits developers who can own that infrastructure and want control over their testing workflow; teams seeking hosted monitoring or RUM should consider a different kind of tool. Its range of diagnostics and CI budget checks is useful, but it is not a replacement for visitor-level monitoring.
sitespeed.io pros and cons
- Where it wins
- Tests real browsers and reports LCP, INP, CLS, video, and HAR waterfalls
- Performance budgets can fail CI builds when limits are exceeded
- Exports metrics to Graphite or InfluxDB for Grafana dashboards
- Where it doesn't
- No real-user monitoring through an installed visitor-data agent
- Teams provide their own compute and results storage
- Self-hosting and CI automation require teams to manage their environment
sitespeed.io fact sheet, pricing and score →
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