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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
80
GRADE
B
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

B
Transfer Efficiency
86% efficient
REVIEW
86% efficient
Info::
Transfer efficiency: 86%
An estimated 173 KB (14%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 173 KB of unused JavaScript. This wasted data produces 0.05g of unnecessary CO2 per page view.
86% efficient

Total waste: 173 KB (14% of page weight)

Unused JS 173 KB

0.05g unnecessary CO2 per visit

Actual transfer 1227 KB
Theoretical minimum 1053 KB
Potential savings 173 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
0.34g CO2 per view
PASS
0.34g CO2 per view
Info::
0.34g CO2 per page view
This page transfers 1.2 MB, producing an estimated 0.34g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.06g, network 0.06g, end-user device 0.22g.
Got: 0.34g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 40.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 40.7 kg of CO2 annually — equivalent to charging 5090 smartphones.

0.34g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 77% of websites

Sustainable Web Design model v4 · Page size: 1.2 MB

Your site
0.34g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.06g
Network
0.06g
End-user device
0.22g
At 10,000 monthly views: Monthly: 3.4 kg · Annual: 40.7 kg · ≈ 5090 smartphone charges
A+
Repeat Visit Weight
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 16 KB (vs 1227 KB first visit). 54 of 55 resources are served from browser cache, saving 0.33g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 0.34g)
First visit
1227 KB
Repeat visit
16 KB

99% reduction on repeat visits

Saving 0.33g CO2 per returning visitor

54 resources served from cache · 1 resources re-downloaded

A
Carbon Budget
23th percentile
PASS
23th percentile
Info::
0.34g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 77% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 23th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.34g

23rd percentile

Cleaner than 77% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 43% cleaner ✓
vs Target 32% 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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