Backlink Database [patched] < Trusted Manual >

| Feature | Ahrefs | Semrush | Majestic | | :--- | :--- | :--- | :--- | | | ~40B pages | ~43B pages | ~14T links (unique) | | Update Frequency | Every 15–30 min | Daily | Every 24 hours | | Unique Metric | DR (Domain Rating) | AS (Authority Score) | Trust Flow | | Historical Data | Yes (3+ years) | Limited | Yes (since 2009) | | Best For | Link intersect & gap analysis | Toxic link audits | Historical backlink patterns |

Traditional metrics (DR/DA) are easily manipulated (PBNs). New databases are integrating NLP to analyze contextual relevance —evaluating if the linking page’s topic semantically matches the target page. backlink database

When a crawler parses an HTML document, it extracts: | Feature | Ahrefs | Semrush | Majestic

Databases with historical snapshots (e.g., Ahrefs, Majestic) allow users to: Majestic) allow users to: