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GTmetrix
Lyon, France
What it is
GTmetrix analyzes website performance and explains causes of slow pages. Reports combine Lighthouse-powered performance and structure scores with Web Vitals and audits ordered by impact. Tests run in a real Chrome browser, while waterfall charts show each request’s timing, status code, response size, 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 run hourly, daily, weekly, or monthly, with historical graphs and performance alerts. GTmetrix provides a REST API and MCP server and names Claude, Cursor, GitHub Copilot CLI, ChatGPT, and Lovable as compatible AI coding tools. API access requires a key and consumes credits. A free option costs nothing; paid plans include Lite at $4.99 a month billed yearly, Core at $9.99, Advanced at $24.99, and Expert at $49.99. Enterprise pricing is custom.
For and against
For
- Real Chrome performance measurements
- Waterfall request diagnostics
- 28 global test locations
- Monitoring schedules and alerts
- REST API and MCP server
Against
- API requests consume credits
- Paid plans billed yearly
- Unlimited tests subject to fair-use policy
The verdict
GTmetrix offers detailed browser-based diagnostics, field data, device simulations, and scheduled monitoring. Its free option provides an entry point, while advanced monitoring and team features require paid plans.
Who it suits
GTmetrix suits developers, marketers, agencies, hobbyists, small businesses, and enterprises monitoring site speed. It is useful for teams needing browser tests, historical monitoring, or API workflows.
Plans and prices
Free
Free option; no credit card required
Read 11 Oct 2026 · gtmetrix.com
Lite
50 On-Demand Tests/month · 1 Monitored Slot · 5 Test Locations · Trial – 10 API/MCP Credits
Read 11 Oct 2026 · gtmetrix.com
Core
150 On-Demand Tests/month · 3 Monitored Slots · 10 Test Locations · 10 Daily API/MCP Credits
Read 11 Oct 2026 · gtmetrix.com
Advanced
Unlimited On-Demand Tests* · 10 Monitored Slots · 28 Test Locations · 50 Daily API/MCP Credits
Read 11 Oct 2026 · gtmetrix.com
Expert
Unlimited On-Demand Tests* · 50 Monitored Slots · 28 Test Locations · 100 Daily API/MCP Credits
Read 11 Oct 2026 · gtmetrix.com
Enterprise Plans
Custom plan; more monitored slots, API credits, and team seats; priority support; white-label PDF reports
Read 11 Oct 2026 · gtmetrix.com
On the record
- API access
- The REST API requires an API key, uses HTTPS, and meters analysis requests with credits.gtmetrix.com · read 11 Oct 2026
- Audience
- GTmetrix describes its users as developers, marketers, hobbyists, agencies, small businesses, and enterprises.gtmetrix.com · read 11 Oct 2026
- Devices and locations
- The product offers testing from 28 global locations and simulates more than 55 mobile and tablet devices.gtmetrix.com · read 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.gtmetrix.com · read 11 Oct 2026
- Monitoring
- Monitored pages can be tested hourly, daily, weekly, or monthly, with historical graphs and performance alerts.gtmetrix.com · read 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.gtmetrix.com · read 11 Oct 2026
- Purpose
- GTmetrix tests website performance and explains why a page is slow and how to optimize it.gtmetrix.com · read 11 Oct 2026
- Real browser
- GTmetrix loads tests in a real Chrome browser and measures observed page performance.gtmetrix.com · read 11 Oct 2026
- Real user data
- GTmetrix uses Chrome UX Report data for field measurements including INP, when a site has sufficient Chrome traffic.gtmetrix.com · read 11 Oct 2026
- Reports
- Reports combine Lighthouse-powered performance and structure scores with Web Vitals and audits ranked by impact.gtmetrix.com · read 11 Oct 2026
- Support
- Enterprise plans include priority support, and the site provides a contact option for questions.gtmetrix.com · read 11 Oct 2026
- Team access
- Expert plans include five team seats with Owner, Administrator, Tester, and Viewer roles.gtmetrix.com · read 11 Oct 2026
- Waterfall
- Waterfall charts break page loads down request by request, including timing, status codes, response sizes, and headers.gtmetrix.com · read 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.gtmetrix.com · read 11 Oct 2026
