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.
Verdict
Choose WebPageTest when
- Technical SEO matters to you. Very strong Core Web Vitals and page-performance diagnostics.
- Measurement & tracking matters to you. Strong measurement, history, comparisons, and monitoring options.
- Agent readiness level matters to you. APIs, scripting, custom metrics, and CI automation make tests programmable, but no dedicated autonomous SEO agent is documented.
- Free tools matters to you. Free tier includes substantial analysis rather than only a teaser.
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: SEO Stuff and WebPageTest.