Sustainability

· 8 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

2.70g CO2 per view

FIX

2.70g CO2 per view

2.70g CO2 per page view

This page transfers 9.6 MB, producing an estimated 2.70g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.50g, network 0.47g, end-user device 1.74g.

Got: 2.70g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 324.6 kg CO2/year

With 10,000 page views per month, this page would generate approximately 324.6 kg of CO2 annually — equivalent to charging 40569 smartphones.

2.70g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 9.6 MB

Your site

2.70g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.50g

Network

0.47g

End-user device

1.74g

At 10,000 monthly views: Monthly: 27.0 kg · Annual: 324.6 kg · ≈ 40569 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

95th percentile

FIX

95th percentile

2.70g CO2 — above the median website (0.60g)

Heavier than an estimated 5% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.

Estimated 95th percentile

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

Top 10%

Target

Median website

2.70g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 351% more

vs Target 441% more

Transfer Efficiency

80% efficient

REVIEW

80% efficient

Transfer efficiency: 80%

An estimated 1910 KB (20%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1910 KB of unused JavaScript. This wasted data produces 0.53g of unnecessary CO2 per page view.

Total waste: 1910 KB (20% of page weight)

Unused JS 1910 KB

0.53g unnecessary CO2 per visit

Actual transfer 9779 KB

Theoretical minimum 7868 KB

Potential savings 1910 KB (0.53g 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 246 KB (vs 9779 KB first visit). 656 of 665 resources are served from browser cache, saving 2.64g CO2 per repeat visit.

Repeat visit: 0.07g CO2 (first visit: 2.70g)

First visit

9779 KB

Repeat visit

246 KB

97% reduction on repeat visits

Saving 2.64g CO2 per returning visitor

656 resources served from cache · 9 resources re-downloaded

A+

Web Font Weight Variants

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

PASS

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

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

Image Optimization

200 images, 967 KB total, 280 KB wasted

INFO

Image Optimization Audit

Total Images

200

Total Size

967 KB

Oversized

Wasted

280 KB

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