Tool: Guardian

Daily snapshots of your money pages. Detect drift in titles, meta descriptions, canonicals, schema, and internal links.

What it does

Guardian monitors your most important pages (homepage, product pages, landing pages) by taking daily snapshots of key SEO elements. When anything changes, it generates a diff with severity levels and can alert you via email or webhook.

Elements monitored

Element	What it captures
Title tag	Full text of `<title>`
Meta description	Full text of `<meta name="description">`
H1 headings	All H1 elements on the page
Canonical URL	The href in `<link rel="canonical">`
Schema types	All JSON-LD `@type` values found
Internal links	Link count and target URLs

Diff severity levels

Severity	Examples
Critical	Title removed, canonical changed to different URL, schema type removed
Warning	Title text changed, meta description changed, H1 modified
Info	Internal link count changed slightly, new schema type added

How it works

Snapshot: Guardian fetches each monitored page once per day and extracts the elements above.
Compare: The new snapshot is compared field-by-field against the previous one.
Alert: If any changes are detected, a diff report is generated with severity classification.
History: All snapshots are stored, so you can see the full timeline of changes.

Use cases

Catch accidental regressions: A deploy that accidentally drops titles or schema.
CMS plugin updates: Detect when a plugin update changes your title template.
Canonical drift: HTTP→HTTPS migration leaving old canonicals.
Competitor monitoring: Track changes to competitor landing pages.