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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
73
GRADE
C
FIX
1
REVIEW
3
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 3 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
Carbon Budget
33th percentile
REVIEW
33th percentile
Info::
0.43g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 67% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 33th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.43g

33rd percentile

Cleaner than 67% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 28% cleaner ✓
vs Target 13% cleaner ✓
C
Transfer Efficiency
Action
72% efficient
REVIEW
72% efficient
Warning::
Transfer efficiency: 72%
An estimated 436 KB (28%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 436 KB of unused JavaScript. This wasted data produces 0.12g of unnecessary CO2 per page view.
72% efficient

Total waste: 436 KB (28% of page weight)

Unused JS 436 KB

0.12g unnecessary CO2 per visit

Actual transfer 1572 KB
Theoretical minimum 1135 KB
Potential savings 436 KB (0.12g 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
0.43g CO2 per view
PASS
0.43g CO2 per view
Info::
0.43g CO2 per page view
This page transfers 1.5 MB, producing an estimated 0.43g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.08g, network 0.08g, end-user device 0.28g.
Got: 0.43g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 52.2 kg CO2/year
With 10,000 page views per month, this page would generate approximately 52.2 kg of CO2 annually — equivalent to charging 6523 smartphones.

0.43g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 67% of websites

Sustainable Web Design model v4 · Page size: 1.5 MB

Your site
0.43g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.08g
Network
0.08g
End-user device
0.28g
At 10,000 monthly views: Monthly: 4.3 kg · Annual: 52.2 kg · ≈ 6523 smartphone charges
A+
Repeat Visit Weight
92% cached
PASS
92% cached
Info::
92% reduction on repeat visits
Returning visitors download only 126 KB (vs 1572 KB first visit). 65 of 66 resources are served from browser cache, saving 0.40g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 0.43g)
First visit
1572 KB
Repeat visit
126 KB

92% reduction on repeat visits

Saving 0.40g CO2 per returning visitor

65 resources served from cache · 1 resources re-downloaded

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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