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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
81
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
Carbon Budget
35th percentile
REVIEW
35th percentile
Info::
0.46g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 65% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 35th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.46g

35th percentile

Cleaner than 65% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 24% cleaner ✓
vs Target 9% cleaner ✓
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
0.46g CO2 per view
PASS
0.46g CO2 per view
Info::
0.46g CO2 per page view
This page transfers 1.6 MB, producing an estimated 0.46g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.08g, network 0.08g, end-user device 0.29g.
Got: 0.46g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 54.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 54.6 kg of CO2 annually — equivalent to charging 6830 smartphones.

0.46g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 65% of websites

Sustainable Web Design model v4 · Page size: 1.6 MB

Your site
0.46g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.08g
Network
0.08g
End-user device
0.29g
At 10,000 monthly views: Monthly: 4.6 kg · Annual: 54.6 kg · ≈ 6830 smartphone charges
A+
Repeat Visit Weight
98% cached
PASS
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 31 KB (vs 1646 KB first visit). 53 of 54 resources are served from browser cache, saving 0.45g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.46g)
First visit
1646 KB
Repeat visit
31 KB

98% reduction on repeat visits

Saving 0.45g CO2 per returning visitor

53 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
92% efficient
PASS
92% efficient
Info::
Transfer efficiency: 92%
Only 128 KB of potential savings identified. Your page is well-optimized for size.
92% efficient

Total waste: 128 KB (8% of page weight)

Unused JS 128 KB

0.04g unnecessary CO2 per visit

Actual transfer 1646 KB
Theoretical minimum 1518 KB
Potential savings 128 KB (0.04g CO2)

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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