GTmetrix is a fine speed tester, but people go looking for alternatives for consistent reasons: the free tier caps you at a handful of tests a month, credits run out fast once you monitor more than a page or two, and it does nothing for SEO. Here are seven options — one of them is ours, and we say so — each judged on what it actually does best.
1. RankVitals(that’s us — here’s exactly how we differ)
RankVitals is our own tool, so read this entry knowing that — we’ve kept the cons honest. It covers the same core as GTmetrix (Lighthouse tests with grades, request waterfalls, filmstrips, scheduled monitoring with alerts) and adds what GTmetrix doesn’t have: a 57-check SEO and AI-readiness crawler, AI-generated fix plans that can open GitHub pull requests, bulk testing, white-label PDF reports, free uptime checks that also alert on TLS-certificate and domain-registration expiry, alerts on Slack, Discord, Microsoft Teams and PagerDuty as well as email, alert conditions that fire on a percent change or a rolling baseline rather than only a fixed number, real-user monitoring on paid plans, a CLI that fails a CI build on a performance-budget breach, and an MCP server so AI assistants like Claude can run and read your tests. The free plan runs single speed tests without spending credits — rate-limited rather than metered — and the REST API is available from the free tier up.
Best for: Teams who want performance and SEO handled in one tool, with AI drafting the fixes.
Pricing: Free (unmetered basic tests, rate-limited); paid from $19/mo
- + Speed + SEO + AI fix plans in one product
- + Multi-channel alerts, certificate + domain expiry, RUM on paid plans
- + MCP server for AI assistants — first in the category
- − Single test region today (more planned)
- − Newer product with a shorter track record
Full comparison: RankVitals vs RankVitals →
2. Google PageSpeed Insights
The obvious first stop: free, unlimited, no account required, and the only place you’ll see official CrUX field data — the real-user Core Web Vitals Google actually uses in Search. It runs the same Lighthouse engine GTmetrix and RankVitals use, so lab scores are directly comparable. The trade-off is that it is strictly a one-off test: no history, no monitoring, no alerts, no request waterfall, and only basic single-page SEO checks. Perfect as a spot-check and a source of truth for field data; not a replacement for monitoring or site-wide auditing.
Best for: Quick spot-checks and official CrUX field data.
Pricing: Free
- + Free and unlimited
- + Official CrUX field data
- + Free API
- − No history, monitoring, or alerts
- − One URL at a time, basic SEO checks only
Full comparison: RankVitals vs PageSpeed Insights →
3. DebugBear
The most direct paid alternative for serious Core Web Vitals work. DebugBear monitors pages on a schedule from many locations worldwide, and its debugging views go deeper than raw Lighthouse output — LCP sub-part breakdowns, request-level detail, per-element diagnostics — plus a real-user monitoring product with years on ours. It is a performance tool first: on their own site SEO appears as a free single-page checker rather than a site-wide crawl, and you start on a free trial rather than a free plan. If page-speed debugging depth is the one thing you’re optimizing for, it’s arguably best in class, and we say that as a competitor.
Best for: The deepest Core Web Vitals debugging, plus RUM.
Pricing: Free trial, then paid plans — see debugbear.com
- + Deepest CWV debugging views
- + Many monitoring locations + RUM
- − SEO is a free single-page checker, not a site crawl
- − Free trial rather than a free plan
Full comparison: RankVitals vs DebugBear →
4. WebPageTest
The performance engineer’s scalpel. WebPageTest (now part of Catchpoint) produces the most detailed request waterfalls in the industry, filmstrip and video capture, scripted multi-step user journeys, and tests from dozens of locations in many real browsers. The free tier allows a limited number of manual runs; scheduled testing and API access sit on paid plans. Expect a learning curve — reading a WebPageTest waterfall properly is a skill — and no SEO coverage at all. Unbeatable for one-off deep dives; heavier than most teams need for routine monitoring.
Best for: One-off, deep-dive performance analysis.
Pricing: Free tier; paid WebPageTest Pro
- + Industry-best waterfall detail
- + Filmstrip + video, scripted journeys
- + Many locations and real browsers
- − Steeper learning curve
- − Monitoring/API on paid plans; no SEO
Full comparison: RankVitals vs WebPageTest →
5. Pingdom
A different center of gravity: Pingdom (SolarWinds) is first and foremost an uptime and availability product, with a global probe network, synthetic transaction checks, real user monitoring, and alerting that ops teams have relied on for well over a decade. Its page-speed testing reports its own load-time metrics rather than Lighthouse scores, so you won’t get Core Web Vitals grades or Lighthouse audits, and there is no SEO tooling. Choose it when “are we up, everywhere?” matters more to you than “why is LCP slow?” — it is excellent at the former.
Best for: Uptime-first monitoring at scale.
Pricing: Paid plans — uptime-focused; see pingdom.com
- + Battle-tested uptime monitoring + alerting
- + RUM and transaction checks
- − Not Lighthouse-based — no Core Web Vitals grades
- − No SEO auditing
Full comparison: RankVitals vs Pingdom →
6. SpeedCurve
The choice for performance-mature teams that treat speed as a product metric. SpeedCurve combines synthetic testing (built on WebPageTest technology) with real-user monitoring, ties both to performance budgets that can fail builds, and presents everything in some of the best visualizations in the industry — including side-by-side filmstrips against competitors. It is priced for teams rather than individuals, and it does not touch SEO. If you have a performance culture — or want to build one — it is a serious, proven upgrade.
Best for: Performance budgets and competitive benchmarking.
Pricing: Team-level pricing — see speedcurve.com
- + Synthetic + RUM tied to performance budgets
- + Best-in-class visualizations
- − Team-level pricing
- − No SEO auditing
7. Sitespeed.io
The open-source route. Sitespeed.io is a complete performance-monitoring toolbox you run yourself — Docker containers that test pages in real browsers via Browsertime, grade them with its “coach”, and ship metrics to Grafana dashboards. It is genuinely free, endlessly configurable, and respected in the web-performance community. The cost is operational rather than financial: you provision the servers, schedule the runs, and maintain the dashboards, and there is no support team and no SEO audit. Ideal for engineers who prefer infrastructure they control over a SaaS subscription.
Best for: Engineers who want a free, self-hosted pipeline.
Pricing: Free (open source, self-hosted)
- + Free and open source
- + Extremely configurable, Grafana-native
- − You run and maintain the infrastructure
- − No SEO auditing, no support
Try the alternative that does SEO too
Free speed test with waterfall + filmstrip, and an SEO audit in the same tool.
Free plan, no credit card.