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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
82
GRADE
B
FIX
1
REVIEW
2
PASS
3
INFO
0
Device:
Mobile Desktop
Checks
6
3 PASS 2 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::
Azure: Microsoft is carbon-negative; Azure renewable varies by region
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 Azure✗CDN Not identified✗

Azure: Microsoft is carbon-negative; Azure renewable varies by region

Based on known provider commitments. Verify at thegreenwebfoundation.org

B
Carbon Budget
31th percentile
REVIEW
31th percentile
Info::
0.42g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 69% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 31th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.42g

31st percentile

Cleaner than 69% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 30% cleaner ✓
vs Target 16% 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
0.42g CO2 per view
PASS
0.42g CO2 per view
Info::
0.42g CO2 per page view
This page transfers 1.5 MB, producing an estimated 0.42g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.08g, network 0.07g, end-user device 0.27g.
Got: 0.42g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 50.2 kg CO2/year
With 10,000 page views per month, this page would generate approximately 50.2 kg of CO2 annually — equivalent to charging 6277 smartphones.

0.42g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 69% of websites

Sustainable Web Design model v4 · Page size: 1.5 MB

Your site
0.42g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.08g
Network
0.07g
End-user device
0.27g
At 10,000 monthly views: Monthly: 4.2 kg · Annual: 50.2 kg · ≈ 6277 smartphone charges
A+
Repeat Visit Weight
94% cached
PASS
94% cached
Info::
94% reduction on repeat visits
Returning visitors download only 89 KB (vs 1513 KB first visit). 39 of 40 resources are served from browser cache, saving 0.39g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.42g)
First visit
1513 KB
Repeat visit
89 KB

94% reduction on repeat visits

Saving 0.39g CO2 per returning visitor

39 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
93% efficient
PASS
93% efficient
Info::
Transfer efficiency: 93%
Only 99 KB of potential savings identified. Your page is well-optimized for size.
93% efficient

Total waste: 99 KB (7% of page weight)

Unused JS 99 KB

0.03g unnecessary CO2 per visit

Actual transfer 1513 KB
Theoretical minimum 1413 KB
Potential savings 99 KB (0.03g 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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