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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
52% efficient
FIX
52% efficient
Warning::
Transfer efficiency: 52%
An estimated 209 KB (48%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 209 KB of unused JavaScript. This wasted data produces 0.06g of unnecessary CO2 per page view.
52% efficient

Total waste: 209 KB (48% of page weight)

Unused JS 209 KB

0.06g unnecessary CO2 per visit

Actual transfer 439 KB
Theoretical minimum 230 KB
Potential savings 209 KB (0.06g 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
0.12g CO2 per view
PASS
0.12g CO2 per view
Info::
0.12g CO2 per page view
This page transfers 0.4 MB, producing an estimated 0.12g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.02g, end-user device 0.08g.
Got: 0.12g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 14.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 14.6 kg of CO2 annually — equivalent to charging 1824 smartphones.

0.12g

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
0.12g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.02g
Network
0.02g
End-user device
0.08g
At 10,000 monthly views: Monthly: 1.2 kg · Annual: 14.6 kg · ≈ 1824 smartphone charges
A+
Repeat Visit Weight
96% cached
PASS
96% cached
Info::
96% reduction on repeat visits
Returning visitors download only 19 KB (vs 439 KB first visit). 18 of 19 resources are served from browser cache, saving 0.12g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.12g)
First visit
439 KB
Repeat visit
19 KB

96% reduction on repeat visits

Saving 0.12g CO2 per returning visitor

18 resources served from cache · 1 resources re-downloaded

A+
Carbon Budget
10th percentile
PASS
10th percentile
Info::
0.12g 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

0.12g

10th percentile

Cleaner than 90% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 80% cleaner ✓
vs Target 76% 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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