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

79% efficient

REVIEW

79% efficient

Transfer efficiency: 79%

An estimated 340 KB (21%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 340 KB of unused JavaScript. This wasted data produces 0.08g of unnecessary CO2 per page view.

Total waste: 340 KB (21% of page weight)

Unused JS 340 KB

0.08g unnecessary CO2 per visit

Actual transfer 1616 KB

Theoretical minimum 1276 KB

Potential savings 340 KB (0.08g 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

CO2 Per Page Load

0.37g CO2 per view

PASS

0.37g CO2 per view

0.37g CO2 per page view

This page transfers 1.6 MB, producing an estimated 0.37g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.08g, end-user device 0.29g.

Got: 0.37g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 44.8 kg CO2/year

With 10,000 page views per month, this page would generate approximately 44.8 kg of CO2 annually — equivalent to charging 5606 smartphones.

Green hosting reduces data center emissions

0.37g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 73% of websites

Sustainable Web Design model v4 · Page size: 1.6 MB

Your site

0.37g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.01g

Network

0.08g

End-user device

0.29g

At 10,000 monthly views: Monthly: 3.7 kg · Annual: 44.8 kg · ≈ 5606 smartphone charges

Green Hosting

Green (cdn)

PASS

Green (cdn)

Netlify CDN uses renewable energy

Since most traffic is served through the CDN, the majority of data transfer energy is renewable.

Netlify: Hosted on AWS/Google Cloud with renewable energy matching

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 Snowplow Analytics✗CDN Netlify✓

Netlify: Hosted on AWS/Google Cloud with renewable energy matching

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+

Repeat Visit Weight

95% cached

PASS

95% cached

95% reduction on repeat visits

Returning visitors download only 81 KB (vs 1616 KB first visit). 90 of 98 resources are served from browser cache, saving 0.35g CO2 per repeat visit.

Repeat visit: 0.02g CO2 (first visit: 0.37g)

First visit

1616 KB

Repeat visit

81 KB

95% reduction on repeat visits

Saving 0.35g CO2 per returning visitor

90 resources served from cache · 8 resources re-downloaded

Carbon Budget

27th percentile

PASS

27th percentile

0.37g CO2 — below the sustainability target of 0.50g

Cleaner than an estimated 73% of websites analyzed. This page meets the Web Sustainability Guidelines target.

Estimated 27th percentile

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

Top 10%

Target

Median website

0.37g

27th percentile

Cleaner than 73% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 38% cleaner ✓

vs Target 25% cleaner ✓

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

3 images, 0 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

0 KB

3 missing dimensions

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