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Sustainability
· 8 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
5
PASS
1
INFO
1
Checks
81 PASS 5 REVIEW 1 FIX
DGreen HostingActionUnknownFIX
Green Hosting
ActionUnknown
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
BCO2 Per Page Load0.62g CO2 per viewREVIEW
CO2 Per Page Load
0.62g CO2 per view
0.62g CO2 per view
Info::
0.62g CO2 per page view
This page transfers 2.2 MB, producing an estimated 0.62g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.11g, network 0.11g, end-user device 0.40g.
Got: 0.62g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 74.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 74.0 kg of CO2 annually — equivalent to charging 9251 smartphones.
0.62g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 50% of websites
Sustainable Web Design model v4 · Page size: 2.2 MB
Your site
0.62g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.11g
Network
0.11g
End-user device
0.40g
At 10,000 monthly views: Monthly: 6.2 kg · Annual: 74.0 kg · ≈ 9251 smartphone charges
BCarbon Budget50th percentileREVIEW
Carbon Budget
50th percentile
50th percentile
Warning::
0.62g CO2 — above the median website (0.60g)
Heavier than an estimated 50% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 50th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.62g
50th percentile
Cleaner than 50% of websites
✗ Above the median website
vs Median 3% more
vs Target 23% more
CTransfer EfficiencyAction74% efficientREVIEW
Transfer Efficiency
Action74% efficient
74% efficient
Warning::
Transfer efficiency: 74%
An estimated 590 KB (26%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 590 KB of unused JavaScript. This wasted data produces 0.16g of unnecessary CO2 per page view.
Total waste: 590 KB (26% of page weight)
Unused JS 590 KB
0.16g unnecessary CO2 per visit
Actual transfer 2230 KB
Theoretical minimum 1639 KB
Potential savings 590 KB (0.16g CO2)
See Deep Analysis sections above for specific optimizations.
BWeb Font Weight VariantsNo detectable Google Fonts weightsREVIEW
Web Font Weight Variants
No detectable Google Fonts weights
No detectable Google Fonts weights
Info::
No detectable Google Fonts weights
The analyzer detects font weights via Google Fonts URL parameters (~70% of font-using sites). Self-hosted fonts and non-Google CDN fonts aren't visible to URL-based detection. If you self-host fonts, manually audit how many @font-face weights you ship -- 2-3 weights per family is typically enough; 5+ is usually unused payload.
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
ActionWhether the site is served from green-energy infrastructure
Green Hosting
No green hosting detected
A+Repeat Visit Weight99% cachedPASS
Repeat Visit Weight
99% cached
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 18 KB (vs 2230 KB first visit). 77 of 78 resources are served from browser cache, saving 0.61g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.62g)
First visit
2230 KB
Repeat visit
18 KB
99% reduction on repeat visits
Saving 0.61g CO2 per returning visitor
77 resources served from cache · 1 resources re-downloaded
Image Optimization6 images, 10 KB total, 1 KB wastedINFO
Image Optimization
6 images, 10 KB total, 1 KB wasted
Image Optimization Audit
Total Images
6
Total Size
10 KB
Oversized
1
Wasted
1 KB
6 missing dimensions 4 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.