Sustainability

· 6 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

1 PASS 4 REVIEW 1 FIX

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.

Azure: Microsoft is carbon-negative; Azure renewable varies by region

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 Azure✗CDN Not identified✗

Azure: Microsoft is carbon-negative; Azure renewable varies by region

Based on known provider commitments. Verify at thegreenwebfoundation.org

CO2 Per Page Load

0.52g CO2 per view

REVIEW

0.52g CO2 per view

0.52g CO2 per page view

This page transfers 1.8 MB, producing an estimated 0.52g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.10g, network 0.09g, end-user device 0.33g.

Got: 0.52g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 62.6 kg CO2/year

With 10,000 page views per month, this page would generate approximately 62.6 kg of CO2 annually — equivalent to charging 7822 smartphones.

0.52g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 58% of websites

Sustainable Web Design model v4 · Page size: 1.8 MB

Your site

0.52g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.10g

Network

0.09g

End-user device

0.33g

At 10,000 monthly views: Monthly: 5.2 kg · Annual: 62.6 kg · ≈ 7822 smartphone charges

Carbon Budget

42th percentile

REVIEW

42th percentile

0.52g CO2 — below the median website (0.60g)

Better than an estimated 58% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.

Estimated 42th percentile

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

Top 10%

Target

Median website

0.52g

42nd percentile

Cleaner than 58% of websites

✗ Above the median website

vs Median 13% cleaner ✓

vs Target 4% more

Transfer Efficiency

77% efficient

REVIEW

77% efficient

Transfer efficiency: 77%

An estimated 432 KB (23%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 432 KB of unused JavaScript. This wasted data produces 0.12g of unnecessary CO2 per page view.

Total waste: 432 KB (23% of page weight)

Unused JS 432 KB

0.12g unnecessary CO2 per visit

Actual transfer 1885 KB

Theoretical minimum 1453 KB

Potential savings 432 KB (0.12g 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 59 KB (vs 1885 KB first visit). 63 of 68 resources are served from browser cache, saving 0.50g CO2 per repeat visit.

Repeat visit: 0.02g CO2 (first visit: 0.52g)

First visit

1885 KB

Repeat visit

59 KB

97% reduction on repeat visits

Saving 0.50g CO2 per returning visitor

63 resources served from cache · 5 resources re-downloaded

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