GTmetrix vs Seolyzer in 2026: Self-serve page speed testing vs enterprise log analysis
One is a $5.50-a-month tool you can sign up for right now to diagnose a slow page. The other is a demo-gated platform built around fusing crawl data, server logs, and Google Search Console for large sites.
GTmetrix
Seolyzer- GTmetrix has transparent self-serve pricing starting free. Seolyzer has no public pricing page; all plans require a demo request.
- Seolyzer combines site crawling, real-time server log analysis, and Google Search Console data into a single cross-analysis view, something GTmetrix does not attempt.
- GTmetrix measures Core Web Vitals and page speed. Seolyzer does not test page speed at all; it focuses on crawl behavior and indexing.
- Both tools offer API access, GTmetrix from its $18/month Starter plan and Seolyzer from its Professional tier.
- Neither tool tracks how a site is cited or mentioned in AI-generated search answers; Seolyzer confirms this directly in its own FAQ.
- Seolyzer is GDPR compliant with European data hosting, a detail GTmetrix does not document on its own site.
GTmetrix and Seolyzer barely compete for the same buyer. GTmetrix answers a narrow question, why is this page slow, with a waterfall chart and Core Web Vitals breakdown you can access for free. Seolyzer answers a much broader and more technical question, what is Googlebot actually doing on my site, by combining a crawler, real-time server log streaming, and Google Search Console data into one cross-analysis view, sold through a sales conversation with no public pricing. If you need to fix page speed today, GTmetrix gets you there in minutes. If you are running crawl budget diagnostics on a site with millions of URLs, Seolyzer is built for a problem GTmetrix does not touch.
The tools at a glance
GTmetrix
Page speed analysis with Lighthouse, Web Vitals, waterfall charts, and performance monitoring.
GTmetrix tests a single page at a time through a real Chromium browser and returns a waterfall chart, Core Web Vitals scores, and a Lighthouse-based grade. The free tier is fully usable on its own: no credit card, real waterfall data, real Web Vitals. Paid plans starting at $5.50 a month add monitoring slots, more test locations, and mobile device emulation, with API access unlocking at the $18 Starter tier.
What GTmetrix does not do is crawl a site or read server logs. It has no visibility into which pages Googlebot actually visits, how often, or with what response codes, the exact gap Seolyzer is built to fill. For a single-page performance check, GTmetrix is faster to start using and requires no sales conversation.
GTmetrix is the right tool when the question is narrow, is this specific page fast enough. It is the wrong tool when the question is broader, is Googlebot wasting crawl budget on the wrong URLs across a million-page site, because that data simply is not something GTmetrix collects.
| Feature | Free Free | Solo $5.50/mo | Starter $18/mo | Growth $40/mo |
|---|---|---|---|---|
| On-demand tests | Limited | 50/mo | 200/mo | Unlimited |
| Monitored pages | 0 | 1 | 5 | 20 |
| Test locations | 1 | 7 | 14 | 22+ |
| Mobile testing | No | Yes | Yes | Yes |
| API access | No | No | Yes | Yes |
Seolyzer
Technical SEO data platform combining site crawling, real-time log analysis, and Google Search Console in one interface
Seolyzer is built around a capability few tools in this category offer: fusing a site crawler, real-time server log streaming, and Google Search Console data into one cross-analysis view. That combination lets you see not just how your site is structured, but what Googlebot actually did when it visited, which pages get crawled frequently, which get ignored, and where crawl budget is being wasted on URLs that add no SEO value.
This depth comes with real friction for anyone comparing it to a self-serve tool like GTmetrix. There is no public pricing page, every plan requires a demo request, and the log analysis module has a learning curve that assumes you already understand server log formats and Googlebot behavior. Seolyzer confirms in its own FAQ that it does not track AI search visibility or AI Overviews at all, it is scoped entirely to traditional crawl and indexing health.
The enterprise credibility is real: Club Med and ManoMano are named clients, and ManoMano specifically uses the API to pull millions of internal links for data science work. That signals Seolyzer is designed to plug into larger technical SEO workflows, not to be a quick diagnostic tool you open for five minutes and close.
| Feature | Starter Contact for pricing | Professional Contact for pricing | Enterprise Contact for pricing |
|---|---|---|---|
| SEO Crawler | ✓ | ✓ | ✓ |
| Log analysis | ✓ | ✓ | ✓ |
| Cross-analysis (data fusion) | ✗ | ✓ | ✓ |
| API access | ✗ | ✓ | ✓ |
| Scheduled / recurring crawls | ✗ | ✓ | ✓ |
| Google Search Console integration | ✓ | ✓ | ✓ |
| GDPR-compliant hosting | ✓ | ✓ | ✓ |
Head-to-head feature comparison
| Feature | GTmetrix | Seolyzer |
|---|---|---|
| Public self-serve pricing | Yes | No (contact for pricing) |
| Free tier | Yes | No |
| Page speed / Core Web Vitals testing | Yes | No |
| Site crawler & technical audit | No | Yes |
| Server log file analysis | No | Yes (real-time) |
| Google Search Console integration | No | Yes |
| Cross-analysis (crawl + logs + GSC fused) | No | Yes |
| Scheduled / recurring monitoring | Yes (paid plans) | Yes (Professional+) |
| API access | Yes (Starter+) | Yes (Professional+) |
| Multi-location speed testing | Yes (paid plans) | No |
| AI search visibility tracking | No | No |
Which should you choose?
GTmetrixSeolyzerSeolyzerGTmetrixGTmetrixSeolyzerThese tools rarely compete for the same budget line. GTmetrix is a self-serve diagnostic you can start using in the next five minutes for free. Seolyzer is a sales-led platform aimed at teams that already know they have a crawl budget or indexing problem and need log-level evidence to prove it. Comparing their pricing is close to meaningless since one is public and the other is not; comparing their actual capabilities makes clear they solve different problems.
Bottom line
Pick GTmetrix if the job is diagnosing and fixing page speed issues without waiting on a sales team. Pick Seolyzer if you manage a large site, already suspect a crawl budget or indexing problem, and need real-time log data cross-referenced against Google Search Console to prove it. Most technical SEO programs at scale will eventually need something like Seolyzer for crawl diagnostics and something like GTmetrix for performance, since neither replaces the other.
Frequently asked questions
Is GTmetrix a substitute for Seolyzer for large-site crawl budget analysis?
No, GTmetrix does not crawl a site or read server logs at all, so it cannot answer crawl budget questions the way Seolyzer does. GTmetrix tells you whether a specific page is fast; Seolyzer tells you what Googlebot is actually doing across your entire site by streaming log data in real time and cross-referencing it with crawl and Google Search Console data.
Why does Seolyzer not show pricing on its website?
Seolyzer routes every plan through a demo request instead of publishing prices, which typically signals enterprise-level cost and a sales-led buying process. GTmetrix takes the opposite approach with a free tier and published prices starting at $5.50 a month, so if a self-serve signup matters to you, that difference alone may decide the comparison.
Does either GTmetrix or Seolyzer track AI Overviews or AI search visibility?
Neither does. Seolyzer states directly in its own FAQ that it focuses entirely on traditional crawl health, server log analysis, and Google Search Console integration, with no AI search monitoring. GTmetrix is scoped to page speed and Core Web Vitals only. If AI visibility tracking is part of your reporting, you need a separate dedicated tool for that.
Which tool is better for a technical SEO consultant working on a site migration?
Seolyzer is the stronger fit for migration work specifically, since its cross-analysis view shows discrepancies between what your crawler finds, what Googlebot actually visits, and what Google Search Console reports, which is exactly the kind of comparison migrations require. GTmetrix is still useful alongside it for confirming the migrated pages load fast, but it will not tell you whether Googlebot is indexing the new URLs correctly.
Does Seolyzer require technical expertise to use effectively?
Yes, more than GTmetrix does. Seolyzer's log analysis module assumes familiarity with server log formats and Googlebot crawl behavior, and the platform is built for teams that already have strong technical SEO foundations rather than beginners. GTmetrix, by contrast, is designed so a non-specialist can look at a waterfall chart and understand what is slowing a page down without prior training.