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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
78
GRADE
C
FIX
2
REVIEW
1
PASS
3
INFO
0
Device:
Mobile Desktop
Checks
6
3 PASS 1 REVIEW 2 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

D
Transfer Efficiency
Action
57% efficient
FIX
57% efficient
Warning::
Transfer efficiency: 57%
An estimated 164 KB (43%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 164 KB of unused JavaScript. This wasted data produces 0.05g of unnecessary CO2 per page view.
57% efficient

Total waste: 164 KB (43% of page weight)

Unused JS 164 KB

0.05g unnecessary CO2 per visit

Actual transfer 379 KB
Theoretical minimum 215 KB
Potential savings 164 KB (0.05g 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: 12.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 12.6 kg of CO2 annually — equivalent to charging 1575 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: 12.6 kg · ≈ 1575 smartphone charges
A+
Repeat Visit Weight
97% cached
PASS
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 10 KB (vs 379 KB first visit). 88 of 93 resources are served from browser cache, saving 0.10g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 0.11g)
First visit
379 KB
Repeat visit
10 KB

97% reduction on repeat visits

Saving 0.10g CO2 per returning visitor

88 resources served from cache · 5 resources re-downloaded

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 79% 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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