GTmetrix

GTmetrix is a website speed testing service. It measures how quickly a page loads, explains why it may be slow and points to changes that could improve it. Each test produces a summarised report for the page.

What GTmetrix offers

• Performance reports — Lighthouse metrics and audits, Web Vitals (LCP, TBT, CLS), a waterfall chart, video capture and report history.
• Scheduled monitoring — pages are tested on a schedule so changes in speed can be tracked over time.
• Alerts — a notification with a link to the full report is sent when a page underperforms.
• Device testing — a real Android device or over 30 simulated devices, including iPhones, iPads and Samsung Galaxy phones.
• Report management — a dashboard table lets users sort, filter and tag their reports.

Who it works with

Site owners and companies that want pages to load quickly for visitors in different countries, browsers and connection speeds. A paid PRO tier is aimed at professional use.

Key facts

• Test locations: 22 global locations, with the premium ones on the PRO tier
• Mobile testing: available on the PRO tier only