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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
76
GRADE
C
FIX
1
REVIEW
2
PASS
3
INFO
0
Device:
Mobile Desktop
Checks
6
3 PASS 2 REVIEW 1 FIX
D
Green Hosting
Action
Unknown
FIX
Unknown
Info::
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.
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 HostingUnable to Determine
Hosting Not identified✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

C
Transfer Efficiency
Action
64% efficient
REVIEW
64% efficient
Warning::
Transfer efficiency: 64%
An estimated 528 KB (36%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 528 KB of unused JavaScript. This wasted data produces 0.15g of unnecessary CO2 per page view.
64% efficient

Total waste: 528 KB (36% of page weight)

Unused JS 528 KB

0.15g unnecessary CO2 per visit

Actual transfer 1458 KB
Theoretical minimum 930 KB
Potential savings 528 KB (0.15g 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
0.40g CO2 per view
PASS
0.40g CO2 per view
Info::
0.40g CO2 per page view
This page transfers 1.4 MB, producing an estimated 0.40g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.07g, network 0.07g, end-user device 0.26g.
Got: 0.40g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 48.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 48.4 kg of CO2 annually — equivalent to charging 6051 smartphones.

0.40g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 70% of websites

Sustainable Web Design model v4 · Page size: 1.4 MB

Your site
0.40g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.07g
Network
0.07g
End-user device
0.26g
At 10,000 monthly views: Monthly: 4.0 kg · Annual: 48.4 kg · ≈ 6051 smartphone charges
A+
Repeat Visit Weight
88% cached
PASS
88% cached
Info::
88% reduction on repeat visits
Returning visitors download only 170 KB (vs 1458 KB first visit). 87 of 89 resources are served from browser cache, saving 0.36g CO2 per repeat visit.
Info::
Repeat visit: 0.05g CO2 (first visit: 0.40g)
First visit
1458 KB
Repeat visit
170 KB

88% reduction on repeat visits

Saving 0.36g CO2 per returning visitor

87 resources served from cache · 2 resources re-downloaded

A
Carbon Budget
30th percentile
PASS
30th percentile
Info::
0.40g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 70% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 30th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.40g

30th percentile

Cleaner than 70% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 33% cleaner ✓
vs Target 19% 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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