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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
0.25g CO2 per view
PASS
0.25g CO2 per view
Info::
0.25g CO2 per page view
This page transfers 0.9 MB, producing an estimated 0.25g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.05g, network 0.04g, end-user device 0.16g.
Got: 0.25g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 29.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 29.7 kg of CO2 annually — equivalent to charging 3707 smartphones.

0.25g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 86% of websites

Sustainable Web Design model v4 · Page size: 0.9 MB

Your site
0.25g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.05g
Network
0.04g
End-user device
0.16g
At 10,000 monthly views: Monthly: 2.5 kg · Annual: 29.7 kg · ≈ 3707 smartphone charges
A+
Repeat Visit Weight
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 7 KB (vs 893 KB first visit). 22 of 23 resources are served from browser cache, saving 0.25g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 0.25g)
First visit
893 KB
Repeat visit
7 KB

99% reduction on repeat visits

Saving 0.25g CO2 per returning visitor

22 resources served from cache · 1 resources re-downloaded

A
Carbon Budget
14th percentile
PASS
14th percentile
Info::
0.25g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 86% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 14th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.25g

14th percentile

Cleaner than 86% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 59% cleaner ✓
vs Target 51% cleaner ✓
A+
Transfer Efficiency
94% efficient
PASS
94% efficient
Info::
Transfer efficiency: 94%
Only 56 KB of potential savings identified. Your page is well-optimized for size.
94% efficient

Total waste: 56 KB (6% of page weight)

Unused JS 56 KB

0.02g unnecessary CO2 per visit

Actual transfer 893 KB
Theoretical minimum 836 KB
Potential savings 56 KB (0.02g 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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