GTmetrix
GTmetrix tests website performance and helps explain why pages are slow and what to optimize.
What GTmetrix is
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 ordered by impact. Tests run in a real Chrome browser, and waterfall charts break page 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 such as INP. GTmetrix offers testing from 28 global locations and simulations for more than 55 mobile and tablet devices. Monitored pages can be checked hourly, daily, weekly, or monthly, with historical graphs and performance alerts. The service also provides 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. Unlimited on-demand tests on some plans are subject to a fair-use policy.
Good
- Tests run in a real Chrome browser
- Reports include Web Vitals and impact-ranked audits
- Offers 28 test locations and over 55 device simulations
- Monitoring supports hourly through monthly schedules
- A free plan is available
Watch out
- API requests require a key and use credits
- Unlimited on-demand tests have a fair-use policy
- Some paid plans have no hourly monitoring
Who it suits
GTmetrix describes its audience as developers, marketers, hobbyists, agencies, small businesses, and enterprises. It may suit people who need page performance reports or scheduled monitoring.
Verdict
GTmetrix pairs page performance reporting with request-level waterfalls, monitoring, and API access. A free option is available, while paid plans start at $4.99 a month billed yearly; unlimited testing is subject to fair use on applicable plans.
Plans and prices
From GTmetrix's own pricing page, checked 11 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Free | Free | Free option; no credit card required |
| Lite | $4.99 a month | 50 On-Demand Tests/month · 1 Monitored Slot · 5 Test Locations · Trial – 10 API/MCP Credits · 1 Month Data Retention · No Hourly Monitoring · No Team Seats · billed yearly |
| Core | $9.99 a month | 150 On-Demand Tests/month · 3 Monitored Slots · 10 Test Locations · 10 Daily API/MCP Credits · 6 Months Data Retention · No Hourly Monitoring · No Team Seats · billed yearly |
| Advanced | $24.99 a month | Unlimited On-Demand Tests* · 10 Monitored Slots · 28 Test Locations · 50 Daily API/MCP Credits · 6 Months Data Retention · Hourly Monitoring · No Team Seats · billed yearly |
| Expert | $49.99 a month | Unlimited On-Demand Tests* · 50 Monitored Slots · 28 Test Locations · 100 Daily API/MCP Credits · 12 Months Data Retention · Hourly Monitoring · 5 Team Seats · billed yearly |
| Enterprise Plans | Priced on request | Custom plan; more monitored slots, API credits, and team seats; priority support; white-label PDF reports |
The facts
Each one read from GTmetrix's own pages, with the date it was checked.
What it does
- API access
- The REST API requires an API key, uses HTTPS, and meters analysis requests with credits.checked 11 Oct 2026
- Audience
- GTmetrix describes its users as developers, marketers, hobbyists, agencies, small businesses, and enterprises.checked 11 Oct 2026
- Fair use limit
- Unlimited On-Demand Tests are subject to a fair use policy, and GTmetrix may restrict or suspend excessive or abusive use.checked 11 Oct 2026
- Monitoring
- Monitored pages can be tested hourly, daily, weekly, or monthly, with historical graphs and performance alerts.checked 11 Oct 2026
- Privacy and security
- The privacy policy says GTmetrix does not receive or store Google, Microsoft, or GitHub account passwords used for third-party sign-in.checked 11 Oct 2026
- Purpose
- GTmetrix tests website performance and explains why a page is slow and how to optimize it.checked 11 Oct 2026
- Real user data
- GTmetrix uses Chrome UX Report data for field measurements including INP, when a site has sufficient Chrome traffic.checked 11 Oct 2026
- Reports
- Reports combine Lighthouse-powered performance and structure scores with Web Vitals and audits ranked by impact.checked 11 Oct 2026
- Support
- Enterprise plans include priority support, and the site provides a contact option for questions.checked 11 Oct 2026
- Waterfall
- Waterfall charts break page loads down request by request, including timing, status codes, response sizes, and headers.checked 11 Oct 2026
- Workflow and integrations
- GTmetrix offers a REST API and MCP server, and its homepage names Claude, Cursor, GitHub Copilot CLI, ChatGPT, and Lovable as compatible AI coding tools.checked 11 Oct 2026
Where it runs
- Devices and locations
- The product offers testing from 28 global locations and simulates more than 55 mobile and tablet devices.checked 11 Oct 2026
- Real browser
- GTmetrix loads tests in a real Chrome browser and measures observed page performance.checked 11 Oct 2026
The company
- Founded
- 2009checked 28 Sep 2026
- Headquarters
- Lyon, Francechecked 28 Sep 2026
- Team access
- Expert plans include five team seats with Owner, Administrator, Tester, and Viewer roles.checked 11 Oct 2026
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