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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
84
GRADE
B
FIX
1
REVIEW
1
PASS
4
INFO
0
Device:
Mobile Desktop
Checks
6
4 PASS 1 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
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
CO2 Per Page Load
0.28g CO2 per view
PASS
0.28g CO2 per view
Info::
0.28g CO2 per page view
This page transfers 1.0 MB, producing an estimated 0.28g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.05g, network 0.05g, end-user device 0.18g.
Got: 0.28g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 33.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 33.8 kg of CO2 annually — equivalent to charging 4219 smartphones.

0.28g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 82% of websites

Sustainable Web Design model v4 · Page size: 1.0 MB

Your site
0.28g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.05g
Network
0.05g
End-user device
0.18g
At 10,000 monthly views: Monthly: 2.8 kg · Annual: 33.8 kg · ≈ 4219 smartphone charges
A+
Repeat Visit Weight
96% cached
PASS
96% cached
Info::
96% reduction on repeat visits
Returning visitors download only 38 KB (vs 1017 KB first visit). 83 of 85 resources are served from browser cache, saving 0.27g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.28g)
First visit
1017 KB
Repeat visit
38 KB

96% reduction on repeat visits

Saving 0.27g CO2 per returning visitor

83 resources served from cache · 2 resources re-downloaded

A
Carbon Budget
18th percentile
PASS
18th percentile
Info::
0.28g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 82% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 18th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.28g

18th percentile

Cleaner than 82% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 53% cleaner ✓
vs Target 44% cleaner ✓
A+
Transfer Efficiency
96% efficient
PASS
96% efficient
Info::
Transfer efficiency: 96%
Only 37 KB of potential savings identified. Your page is well-optimized for size.
96% efficient

Total waste: 37 KB (4% of page weight)

Unused JS 37 KB

0.01g unnecessary CO2 per visit

Actual transfer 1017 KB
Theoretical minimum 980 KB
Potential savings 37 KB (0.01g 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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