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PageSpeed Insights alternatives, and when to use each one

November 1, 2026, 4 min read

A row of different handmade brass measuring instruments on a pale blue workbench

We make PageBench, one of the tools on this list, so read this with that in mind. We've tried to be fair: each tool below is the best choice for some job, and that includes jobs ours can't do at all.

PageSpeed Insights is free, needs no account, and shows how real Chrome users experienced your page over the past 28 days, straight from Google. So you probably shouldn't replace it. Most people get more from keeping it and adding one other tool for what it doesn't do.

Pick by what you need to do

  • See how real visitors experience your page

    PageSpeed InsightsFree, no account

  • Test once and fix it with an AI agent, with no setup

    PageBenchFree, no account

  • Let an agent start tests and read reports by itself

    GTmetrix or DebugBearTheir MCP servers need an account

  • Have an agent debug a local build on your computer

    Chrome DevTools MCPFree, open source, needs installing

  • Test a login area or a local site

    LighthouseFree, open source

  • Pull apart one page load in depth

    WebPageTestFree and paid plans

  • Watch a site over time, with alerts

    GTmetrix, DebugBear or SpeedVitalsMostly paid

  • Compare speed around the world

    SpeedVitals or WebPageTestFree and paid plans

We checked these details in November 2026. Plans and limits change often, so we've left out prices and test allowances, and we didn't name a tool's limits where sources disagreed. Check each tool's own site before you decide.

PageSpeed Insights: what real visitors experience

Enter a URL and you get field data from the Chrome User Experience Report next to a Lighthouse lab test, for mobile and desktop.

  • Best for: finding out whether you have a problem at all, using the same real-user data source Google publishes.
  • Falls short on: seeing why. There's no chart of every request over time, and pages without enough traffic have no field data of their own.

Lighthouse: pages behind a login, and local builds

Lighthouse is the open-source engine behind PageSpeed Insights' lab test. It runs in Chrome DevTools, from the command line or as a Node module.

  • Best for: pages that public tools can't reach, like a login area or a site on localhost, and running checks in your build pipeline.
  • Falls short on: consistency. Results depend on your own computer and connection, so scores aren't easily comparable between machines.

WebPageTest: the deepest single test

WebPageTest is the long-standing tool for specialists. It has detailed waterfalls, filmstrips and many test locations and connection types. It's now owned by LogicMonitor through Catchpoint, with a free plan and paid plans.

  • Best for: understanding exactly what happened during one page load, from a location near your visitors.
  • Falls short on: simplicity. The results assume you know how to read them, and you'll need to sign up.

GTmetrix: scheduled tests and an agent connection

GTmetrix combines a Lighthouse-based report with a waterfall and video of the page loading. It has a free plan, and paid plans add more locations, devices and monitoring. It also has an official MCP server, so an AI agent can start tests and read reports.

  • Best for: tracking a site over time from a chosen location.
  • Falls short on: cost at volume. Its MCP tools use the same API credits as its regular API.

We go through this one in more detail in PageBench vs GTmetrix.

DebugBear: monitoring for teams

DebugBear is a paid monitoring product that combines scheduled lab tests with real-user monitoring. It also has an MCP server that works with Claude Code and Cursor.

  • Best for: teams responsible for a site's speed over time, who want alerts and data from their own visitors.
  • Falls short on: one-off checks. It's more than you need to test a side project once.

SpeedVitals: many locations, with real-user monitoring

SpeedVitals tests from many locations and devices, and adds monitoring and real-user data. Its free plan includes 15 speed test credits a week, 10 locations and a limited AI chat about your reports. Paid plans raise those limits, up to 35 locations.

  • Best for: seeing how a site performs around the world, especially if real-user monitoring is on your list too.
  • Falls short on: frequent free testing, because the free credits run out quickly during a round of fixes.

Chrome DevTools MCP: an agent debugging on your machine

This isn't a website. Chrome DevTools MCP is a free, open-source server that lets a coding agent control Chrome on your computer and record performance traces.

  • Best for: working with an agent on a local build, including pages that aren't deployed yet.
  • Falls short on: repeatable conditions, since it runs on your hardware and network. You also have to install and configure it.

PageBench: test once, then hand the fixes to your agent

PageBench is free and has no account or sign-up. It tests a public page in real Chrome on a throttled phone or desktop, and shows a filmstrip, a waterfall and recommendations with measured savings. Copy for AI turns the report into a prompt for your coding agent, and a free image optimizer handles one of the most common fixes.

  • Best for: a quick answer with no setup, followed by a prompt you can paste straight into Claude Code, Cursor or Lovable.

It also falls short in more ways than the other tools here, so here's the full list:

  • You can't choose a test location, and each test runs from one.
  • There's no monitoring or alerts.
  • It doesn't collect real-user data, so it's no replacement for PageSpeed Insights.
  • It only tests public pages, and every report is public to anyone with the link.
  • Agents can read a report, but they can't start a test on their own yet, because the form has a bot check. Tools with an MCP server let them do that.

So which should you use?

Start with PageSpeed Insights to see whether real visitors have a problem. Then add the tool that matches your next step:

  1. To fix it now with an agent, with no setup, use PageBench.
  2. To let an agent run tests by itself, connect GTmetrix or DebugBear, or Chrome DevTools MCP for local work.
  3. To dig into a single load, use WebPageTest.
  4. To keep watching a site over time, use GTmetrix, DebugBear or SpeedVitals.

If you've built with an AI tool and aren't sure where to begin, how to fix your website's speed with Claude Code walks through a real example.