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

Unknown

FIX

Unknown

Hosting provider could not be identified

Without knowing the provider, we cannot determine their energy sourcing. Check with your hosting provider about their 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 HostingUnable to Determine

Hosting Not identified✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

Carbon Budget

Action

51th percentile

FIX

51th percentile

0.65g 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

0.65g

51st percentile

Cleaner than 49% of websites

✗ Above the median website

vs Median 9% more

vs Target 31% more

CO2 Per Page Load

0.65g CO2 per view

REVIEW

0.65g CO2 per view

0.65g CO2 per page view

This page transfers 2.3 MB, producing an estimated 0.65g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.12g, network 0.11g, end-user device 0.42g.

Got: 0.65g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 78.5 kg CO2/year

With 10,000 page views per month, this page would generate approximately 78.5 kg of CO2 annually — equivalent to charging 9809 smartphones.

0.65g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 49% of websites

Sustainable Web Design model v4 · Page size: 2.3 MB

Your site

0.65g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.12g

Network

0.11g

End-user device

0.42g

At 10,000 monthly views: Monthly: 6.5 kg · Annual: 78.5 kg · ≈ 9809 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

95% cached

PASS

95% cached

95% reduction on repeat visits

Returning visitors download only 113 KB (vs 2364 KB first visit). 82 of 83 resources are served from browser cache, saving 0.62g CO2 per repeat visit.

Repeat visit: 0.03g CO2 (first visit: 0.65g)

First visit

2364 KB

Repeat visit

113 KB

95% reduction on repeat visits

Saving 0.62g CO2 per returning visitor

82 resources served from cache · 1 resources re-downloaded

A+

Transfer Efficiency

100% efficient

PASS

100% efficient

Transfer efficiency: 100%

Only 0 KB of potential savings identified. Your page is well-optimized for size.

Actual transfer 2364 KB

Theoretical minimum 2364 KB

See Deep Analysis sections above for specific optimizations.

Image Optimization

15 images, 20096 KB total, 19150 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

20096 KB

Oversized

Wasted

19150 KB

6 missing alt text 8 missing dimensions 2 missing lazy loading

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