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

5 PASS 2 REVIEW

Transfer Efficiency

80% efficient

REVIEW

80% efficient

Transfer efficiency: 80%

An estimated 67 KB (20%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 67 KB of unused JavaScript. This wasted data produces 0.02g of unnecessary CO2 per page view.

Total waste: 67 KB (20% of page weight)

Unused JS 67 KB

0.02g unnecessary CO2 per visit

Actual transfer 338 KB

Theoretical minimum 271 KB

Potential savings 67 KB (0.02g 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+

CO2 Per Page Load

0.08g CO2 per view

PASS

0.08g CO2 per view

0.08g CO2 per page view

This page transfers 0.3 MB, producing an estimated 0.08g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.00g, network 0.02g, end-user device 0.06g.

Got: 0.08g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 9.4 kg CO2/year

With 10,000 page views per month, this page would generate approximately 9.4 kg of CO2 annually — equivalent to charging 1175 smartphones.

Green hosting reduces data center emissions

0.08g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 90% of websites

Sustainable Web Design model v4 · Page size: 0.3 MB

Your site

0.08g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.00g

Network

0.02g

End-user device

0.06g

At 10,000 monthly views: Monthly: 0.8 kg · Annual: 9.4 kg · ≈ 1175 smartphone charges

A+

Green Hosting

Green (both)

PASS

Green (both)

Both hosting and CDN use renewable energy

Got: Hosting: Vercel, CDN: Vercel

Vercel: Hosted on AWS/Google Cloud with renewable energy commitments

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 Hosting✓ Green Hosted

Hosting Vercel✓CDN Vercel✓

Vercel: Hosted on AWS/Google Cloud with renewable energy commitments

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+

Repeat Visit Weight

99% cached

PASS

99% cached

99% reduction on repeat visits

Returning visitors download only 2 KB (vs 338 KB first visit). 19 of 20 resources are served from browser cache, saving 0.08g CO2 per repeat visit.

Repeat visit: 0.00g CO2 (first visit: 0.08g)

First visit

338 KB

Repeat visit

2 KB

99% reduction on repeat visits

Saving 0.08g CO2 per returning visitor

19 resources served from cache · 1 resources re-downloaded

A+

Carbon Budget

10th percentile

PASS

10th percentile

0.08g CO2 — below the sustainability target of 0.50g

Cleaner than an estimated 90% of websites analyzed. This page meets the Web Sustainability Guidelines target.

Estimated 10th percentile

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

Top 10%

Target

Median website

0.08g

10th percentile

Cleaner than 90% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 87% cleaner ✓

vs Target 84% cleaner ✓

A+

Web Font Weight Variants

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

PASS

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

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

Image Optimization

1 images, 75 KB total, 74 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

75 KB

Oversized

Wasted

74 KB

1 missing dimensions 1 missing lazy loading

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