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 3 REVIEW 2 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.

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 Apache HTTP Server✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

Carbon Budget

Action

51th percentile

FIX

51th percentile

0.67g CO2 — above the median website (0.60g)

Heavier than an estimated 49% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.

Estimated 51th percentile

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

Top 10%

Target

Median website

0.67g

51st percentile

Cleaner than 49% of websites

✗ Above the median website

vs Median 11% more

vs Target 33% more

CO2 Per Page Load

0.67g CO2 per view

REVIEW

0.67g CO2 per view

0.67g CO2 per page view

This page transfers 2.4 MB, producing an estimated 0.67g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.12g, network 0.12g, end-user device 0.43g.

Got: 0.67g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 80.0 kg CO2/year

With 10,000 page views per month, this page would generate approximately 80.0 kg of CO2 annually — equivalent to charging 9999 smartphones.

0.67g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 49% of websites

Sustainable Web Design model v4 · Page size: 2.4 MB

Your site

0.67g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.12g

Network

0.12g

End-user device

0.43g

At 10,000 monthly views: Monthly: 6.7 kg · Annual: 80.0 kg · ≈ 9999 smartphone charges

Web Font Weight Variants

No detectable Google Fonts weights

REVIEW

No detectable Google Fonts weights

The analyzer detects font weights via Google Fonts URL parameters (~70% of font-using sites). Self-hosted fonts and non-Google CDN fonts aren't visible to URL-based detection. If you self-host fonts, manually audit how many @font-face weights you ship -- 2-3 weights per family is typically enough; 5+ is usually unused payload.

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

A+

Repeat Visit Weight

100% cached

PASS

100% cached

100% reduction on repeat visits

Returning visitors download only 4 KB (vs 2410 KB first visit). 56 of 58 resources are served from browser cache, saving 0.67g CO2 per repeat visit.

Repeat visit: 0.00g CO2 (first visit: 0.67g)

First visit

2410 KB

Repeat visit

4 KB

100% reduction on repeat visits

Saving 0.67g CO2 per returning visitor

56 resources served from cache · 2 resources re-downloaded

A+

Transfer Efficiency

96% efficient

PASS

96% efficient

Transfer efficiency: 96%

Only 84 KB of potential savings identified. Your page is well-optimized for size.

Total waste: 84 KB (4% of page weight)

Unused JS 84 KB

0.02g unnecessary CO2 per visit

Actual transfer 2410 KB

Theoretical minimum 2325 KB

Potential savings 84 KB (0.02g CO2)

See Deep Analysis sections above for specific optimizations.

Image Optimization

30 images, 0 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

0 KB

Oversized

26 missing dimensions 17 missing lazy loading

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