Comparing Reports
The Report Comparison page lets you compare two site-level reports side-by-side. You can compare reports for the same site over time, or compare reports across different sites in your account.
How to reach it
Section titled “How to reach it”From the Site Report, click Compare Report in the top-right actions. This opens a two-step modal:
- Select the site you want to compare against.
- Select a completed report from that site.
The current report is always the first comparison column. You can only compare two reports at once.
What you’ll see
Section titled “What you’ll see”The comparison view shows both reports side-by-side with colour-coded grades and numeric values:
- Performance Score — overall score, letter grade, and category grades for both reports
- Core Web Vitals — LCP, FCP, CLS, INP, TTFB, TBT, and Speed Index
- Asset Sizes — JavaScript, CSS, images, HTML, and total payload
- Sustainability & Accessibility — CO₂ per page view, total accessibility issues, and average issues per page
- GEO Analysis — semantic structure, AI crawlability, content extractability, and overall GEO score
- AI Agent Accessibility — LLMs.txt/robots.txt status, agent access risk, blockers, warnings, and recommended actions
Each section also includes charts so you can spot changes at a glance.
Exporting the comparison
Section titled “Exporting the comparison”Click Export in the top-right of the comparison page and choose Download PDF. The export is queued and processed by the standard export pipeline, so you can track its progress from the page or find it later in Exports Management.
The exported PDF uses the standard PerfLeaf template with the shared header and shows all compared metrics in a table format.
Interpreting results
Section titled “Interpreting results”- Higher performance score — the second report scored better overall
- Lower CO₂ — the second report is more carbon-efficient
- Fewer accessibility issues — the second report has fewer accessibility violations
- Grade changes — watch for letter-grade shifts (A→B, C→A, etc.) between reports
Limitations
Section titled “Limitations”- Only two reports can be compared at once.
- You can compare reports across any sites in your account, but metrics may differ in scale between sites.
- Only reports with a status of Complete can be selected for comparison.