Sustainability

· 7 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Device:

Mobile Desktop

Checks

2 PASS 2 REVIEW 3 FIX

CO2 Per Page Load

Action

1.99g CO2 per view

FIX

1.99g CO2 per view

1.99g CO2 per page view

This page transfers 7.0 MB, producing an estimated 1.99g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.37g, network 0.34g, end-user device 1.28g.

Got: 1.99g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 239.1 kg CO2/year

With 10,000 page views per month, this page would generate approximately 239.1 kg of CO2 annually — equivalent to charging 29886 smartphones.

1.99g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 11% of websites

Sustainable Web Design model v4 · Page size: 7.0 MB

Your site

1.99g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.37g

Network

0.34g

End-user device

1.28g

At 10,000 monthly views: Monthly: 19.9 kg · Annual: 239.1 kg · ≈ 29886 smartphone charges

Green Hosting

Action

Not green

FIX

Not green

No confirmed renewable energy commitment detected

Consider providers like Cloudflare, Google Cloud, or Vercel that match 100% of their energy use with renewables.

Green hosting status based on known provider commitments

Green hosting detection uses a curated database of provider renewable energy commitments. This is not a real-time verification. For authoritative checks, visit thegreenwebfoundation.org.

Green HostingNot Green Hosted

Hosting Amazon Web Services✗CDN Shopify✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

Carbon Budget

Action

89th percentile

FIX

89th percentile

1.99g CO2 — above the median website (0.60g)

Heavier than an estimated 11% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.

Estimated 89th percentile

Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.

Top 10%

Target

Median website

1.99g

89th percentile

Cleaner than 11% of websites

✗ Above the median website

vs Median 232% more

vs Target 298% more

Transfer Efficiency

88% efficient

REVIEW

88% efficient

Transfer efficiency: 88%

An estimated 892 KB (12%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 892 KB of unused JavaScript. This wasted data produces 0.25g of unnecessary CO2 per page view.

Total waste: 892 KB (12% of page weight)

Unused JS 892 KB

0.25g unnecessary CO2 per visit

Actual transfer 7204 KB

Theoretical minimum 6311 KB

Potential savings 892 KB (0.25g CO2)

See Deep Analysis sections above for specific optimizations.

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

A+

Repeat Visit Weight

97% cached

PASS

97% cached

97% reduction on repeat visits

Returning visitors download only 239 KB (vs 7204 KB first visit). 623 of 636 resources are served from browser cache, saving 1.93g CO2 per repeat visit.

Repeat visit: 0.07g CO2 (first visit: 1.99g)

First visit

7204 KB

Repeat visit

239 KB

97% reduction on repeat visits

Saving 1.93g CO2 per returning visitor

623 resources served from cache · 13 resources re-downloaded

A+

Web Font Weight Variants

2 font weights loaded across 1 famil(y/ies) -- reasonable

PASS

2 font weights loaded across 1 famil(y/ies) -- reasonable

2 font weight(s) loaded across 1 famil(y/ies)

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.