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Sustainability

· 7 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
4
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
7
2 PASS 4 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
0.52g CO2 per view
REVIEW
0.52g CO2 per view
Info::
0.52g CO2 per page view
This page transfers 1.8 MB, producing an estimated 0.52g 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: 0.52g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 62.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 62.3 kg of CO2 annually — equivalent to charging 7785 smartphones.

0.52g

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
0.52g
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: 5.2 kg · Annual: 62.3 kg · ≈ 7785 smartphone charges
B
Carbon Budget
41th percentile
REVIEW
41th percentile
Info::
0.52g 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

0.52g

41st percentile

Cleaner than 59% of websites

✗ Above the median website

vs Median 13% cleaner ✓
vs Target 4% more
B
Web Font Weight Variants
No detectable Google Fonts weights
REVIEW
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.
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Repeat Visit Weight
93% cached
PASS
93% cached
Info::
93% reduction on repeat visits
Returning visitors download only 128 KB (vs 1876 KB first visit). 340 of 342 resources are served from browser cache, saving 0.48g CO2 per repeat visit.
Info::
Repeat visit: 0.04g CO2 (first visit: 0.52g)
First visit
1876 KB
Repeat visit
128 KB

93% reduction on repeat visits

Saving 0.48g CO2 per returning visitor

340 resources served from cache · 2 resources re-downloaded

A+
Transfer Efficiency
90% efficient
PASS
90% efficient
Info::
Transfer efficiency: 90%
Only 179 KB of potential savings identified. Your page is well-optimized for size.
90% efficient

Total waste: 179 KB (10% of page weight)

Unused JS 179 KB

0.05g unnecessary CO2 per visit

Actual transfer 1876 KB
Theoretical minimum 1697 KB
Potential savings 179 KB (0.05g 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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