GTmetrix tests website performance and helps explain why pages are slow and what to optimize. Its reports combine Lighthouse-powered performance and structure scores with Web Vitals and audits ranked by impact. Tests run in a real Chrome browser, while waterfall charts break loads into individual requests with timing, status codes, response sizes, and headers. For sites with sufficient Chrome traffic, Chrome UX Report data supplies field measurements including INP. Testing is available from 28 global locations and can simulate more than 55 mobile and tablet devices. Monitored pages can be tested hourly, daily, weekly, or monthly, with historical graphs and performance alerts. GTmetrix offers a REST API and MCP server, and names Claude, Cursor, GitHub Copilot CLI, ChatGPT, and Lovable as compatible AI coding tools. API use requires a key and consumes credits. A free option is available; paid plans start at 4.99 USD per month billed yearly. Unlimited on-demand tests on some plans are subject to a fair-use policy.
Who it is for
It suits developers, marketers, hobbyists, agencies, small businesses, and enterprises seeking page-performance reports or ongoing monitoring. Teams can also use its API and MCP server in workflows involving the named AI coding tools.
What is good
- Reports combine Lighthouse scores, Web Vitals, and audits.
- Waterfalls detail requests, timing, status, sizes, and headers.
- Tests span 28 locations and 55+ device simulations.
- Monitoring includes historical graphs and performance alerts.
- Free option is available.
What to know first
- Paid plans start at 4.99 USD per month billed yearly.
- API requests require a key and use credits.
- Field measurements depend on sufficient Chrome traffic.
- Unlimited tests are subject to fair-use policy.
Verdict
GTmetrix pairs browser-based testing and request-level diagnostics with location, device, and scheduled-monitoring options. The free option offers an entry point, while API credits and fair-use limits are worth noting for heavier workflows.
GTmetrix plans and pricing
All plansCompared on website monitoring software
- Free plan
- No
- Check types
- http
- Latency monitoring
- Yes
- Page health checks
- Yes
- API access
- Yes
