Verdict
Choose GTmetrix when
- Technical SEO matters to you. Strong technical performance and Core Web Vitals diagnostics, but not a full technical SEO crawler.
- Measurement & tracking matters to you. Excellent synthetic measurement, monitoring, history, alerts, and real-user metrics.
- Agent readiness level matters to you. A current MCP server and REST API make testing agent-callable, but the product does not execute site fixes or retain business context.
- Estimated customer scale matters to you. First-party figures indicate substantial adoption and enterprise reach.
Verdict
Choose SEO Stuff when
- Keyword research quality for SEO content matters to you. Strong documented keyword metrics, filtering, intent and scale for a lightweight product.
- AI-search / GEO matters to you. AI-search visibility and citation optimization are explicit product/service goals across several current pages.
- GEO readiness matters to you. Good documented readiness for major AI-search surfaces, though no independent measurement method is provided.
- Content execution matters to you. Content execution exists primarily as paid human-edited services, with limited proof of an in-app writing workflow.
These tools solve different jobs. Scores are shown against each tool's own category, so the overall grades are not directly comparable. How grades work.
Read the full reviews: GTmetrix and SEO Stuff.