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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
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
CO2 Per Page Load
0.51g CO2 per view
REVIEW
0.51g CO2 per view
Info::
0.51g CO2 per page view
This page transfers 1.8 MB, producing an estimated 0.51g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.10g, network 0.09g, end-user device 0.33g.
Got: 0.51g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 61.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 61.7 kg of CO2 annually — equivalent to charging 7713 smartphones.

0.51g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 59% of websites

Sustainable Web Design model v4 · Page size: 1.8 MB

Your site
0.51g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.10g
Network
0.09g
End-user device
0.33g
At 10,000 monthly views: Monthly: 5.1 kg · Annual: 61.7 kg · ≈ 7713 smartphone charges
B
Carbon Budget
41th percentile
REVIEW
41th percentile
Info::
0.51g CO2 — below the median website (0.60g)
Better than an estimated 59% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.
Info::
Estimated 41th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.51g

41st percentile

Cleaner than 59% of websites

✗ Above the median website

vs Median 14% cleaner ✓
vs Target 3% more
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Repeat Visit Weight
100% cached
PASS
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 6 KB (vs 1859 KB first visit). 52 of 53 resources are served from browser cache, saving 0.51g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 0.51g)
First visit
1859 KB
Repeat visit
6 KB

100% reduction on repeat visits

Saving 0.51g CO2 per returning visitor

52 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
100% efficient
PASS
100% efficient
Info::
Transfer efficiency: 100%
Only 0 KB of potential savings identified. Your page is well-optimized for size.
100% efficient
Actual transfer 1859 KB
Theoretical minimum 1859 KB

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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