Checks & Scores
SEO Spider runs 300+ checks across 25 categories and produces three distinct scores — Page, Device, and Site.
Every crawl runs 300+ checks across 25 categories on each page, then rolls the results into three separate scores. The checks are the raw findings. The scores are how those findings roll up, so you can judge a page, a device render, or the whole site at a glance.
The 25 categories
Checks are grouped into categories covering the full surface of technical and on-page SEO, including:
- Content, Metadata, and Headings
- Links and URL structure
- Images and Video SEO
- Schema markup and industry schema
- Canonical URLs, meta robots, and robots.txt
- XML sitemap and crawlability
- Performance and mobile responsiveness
- Security and HTML validation
- Internationalization (hreflang) and local SEO
- Social media, accessibility, and brand mentions
- LLMs.txt / LLM optimization and answer engine optimization (AEO)
Severity
Each finding maps to one fixed severity, so the same problem always carries the same weight and you can work top-down without re-judging each one:
| Severity | What it means |
|---|---|
| Critical | Blocks indexing or ranking — fix before anything else |
| High | A real ranking or crawl problem, not fatal on its own |
| Medium | Worth fixing, meaningful but not urgent |
| Low | Minor polish with limited impact |
The Issues board uses these same severities to order the fix-first queue, and the quick wins panel pulls the high-impact, low-effort findings to the front.
Three scores
Spider reports three distinct scores. Keeping them separate tells you whether a problem is on one page, one device, or the whole site.
| Score | What it measures |
|---|---|
| Page score | A single page's health, 0–100 with an A–F grade. Indexability-aware — a page that can't be indexed is scored down hard. |
| Device score | The average of a device's page scores, so you can compare mobile vs desktop vs tablet. |
| Site score | A site-level composite built from site-wide checks such as SSL/HTTPS, robots.txt, the XML sitemap, and llms.txt. |
Indexability problems outrank everything else. A page that can't be indexed can't rank, no matter how good the rest of its SEO is. That's why the page score weights them heavily.