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Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
90
GRADE
A
FIX
0
REVIEW
2
PASS
4
INFO
0
Device:
Mobile Desktop
Checks
6
4 PASS 2 REVIEW
B
Carbon Budget
37th percentile
REVIEW
37th percentile
Info::
0.48g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 63% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 37th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.48g

37th percentile

Cleaner than 63% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 20% cleaner ✓
vs Target 4% cleaner ✓
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
CO2 Per Page Load
0.48g CO2 per view
PASS
0.48g CO2 per view
Info::
0.48g CO2 per page view
This page transfers 2.0 MB, producing an estimated 0.48g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.10g, end-user device 0.37g.
Got: 0.48g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 57.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 57.3 kg of CO2 annually — equivalent to charging 7167 smartphones.
Info::
Green hosting reduces data center emissions

0.48g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 63% of websites

Sustainable Web Design model v4 · Page size: 2.0 MB

Your site
0.48g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.01g
Network
0.10g
End-user device
0.37g
At 10,000 monthly views: Monthly: 4.8 kg · Annual: 57.3 kg · ≈ 7167 smartphone charges
A+
Green Hosting
Green (both)
PASS
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Vercel, CDN: Vercel
Info::
Vercel: Hosted on AWS/Google Cloud with renewable energy commitments
Info::
Vercel: Hosted on AWS/Google Cloud with renewable energy commitments
Info::
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

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

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
94% cached
PASS
94% cached
Info::
94% reduction on repeat visits
Returning visitors download only 124 KB (vs 2067 KB first visit). 113 of 116 resources are served from browser cache, saving 0.45g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 0.48g)
First visit
2067 KB
Repeat visit
124 KB

94% reduction on repeat visits

Saving 0.45g CO2 per returning visitor

113 resources served from cache · 3 resources re-downloaded

A+
Transfer Efficiency
91% efficient
PASS
91% efficient
Info::
Transfer efficiency: 91%
Only 191 KB of potential savings identified. Your page is well-optimized for size.
91% efficient

Total waste: 191 KB (9% of page weight)

Unused JS 191 KB

0.04g unnecessary CO2 per visit

Actual transfer 2067 KB
Theoretical minimum 1875 KB
Potential savings 191 KB (0.04g CO2)

See Deep Analysis sections above for specific optimizations.

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

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