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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
80
GRADE
B
FIX
1
REVIEW
3
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 3 REVIEW 1 FIX
D
Green Hosting
Action
Not green
FIX
Not green
Info::
No confirmed renewable energy commitment detected
Consider providers like Cloudflare, Google Cloud, or Vercel that match 100% of their energy use with renewables.
Info::
AWS: Renewable energy varies by region; committed to 100% by 2025
Info::
AWS CloudFront: Renewable varies by edge location
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 HostingNot Green Hosted
Hosting AWS✗CDN AWS CloudFront✗

AWS: Renewable energy varies by region; committed to 100% by 2025

AWS CloudFront: Renewable varies by edge location

Based on known provider commitments. Verify at thegreenwebfoundation.org

B
Repeat Visit Weight
76% cached
REVIEW
76% cached
Info::
76% reduction on repeat visits
Returning visitors download only 93 KB (vs 393 KB first visit). 19 of 20 resources are served from browser cache, saving 0.08g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 0.11g)
First visit
393 KB
Repeat visit
93 KB

76% reduction on repeat visits

Saving 0.08g CO2 per returning visitor

19 resources served from cache · 1 resources re-downloaded

B
Transfer Efficiency
90% efficient
REVIEW
90% efficient
Info::
Transfer efficiency: 90%
An estimated 39 KB (10%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 39 KB of unused JavaScript. This wasted data produces 0.01g of unnecessary CO2 per page view.
90% efficient

Total waste: 39 KB (10% of page weight)

Unused JS 39 KB

0.01g unnecessary CO2 per visit

Actual transfer 393 KB
Theoretical minimum 354 KB
Potential savings 39 KB (0.01g CO2)

See Deep Analysis sections above for specific optimizations.

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
0.11g CO2 per view
PASS
0.11g CO2 per view
Info::
0.11g CO2 per page view
This page transfers 0.4 MB, producing an estimated 0.11g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.02g, end-user device 0.07g.
Got: 0.11g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 13.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 13.1 kg of CO2 annually — equivalent to charging 1634 smartphones.

0.11g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 90% of websites

Sustainable Web Design model v4 · Page size: 0.4 MB

Your site
0.11g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.02g
Network
0.02g
End-user device
0.07g
At 10,000 monthly views: Monthly: 1.1 kg · Annual: 13.1 kg · ≈ 1634 smartphone charges
A+
Carbon Budget
10th percentile
PASS
10th percentile
Info::
0.11g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 90% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 10th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.11g

10th percentile

Cleaner than 90% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 82% cleaner ✓
vs Target 78% cleaner ✓
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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