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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
84
GRADE
B
FIX
0
REVIEW
4
PASS
3
INFO
0
Checks
7
3 PASS 4 REVIEW
B
Green Hosting
Green (hosting)
REVIEW
Green (hosting)
Info::
Kualo uses renewable energy
Info::
Kualo: Verified by the Green Web Foundation
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 Hosting Green Hosted
Hosting KualoCDN Not identified

Kualo: Verified by the Green Web Foundation

Based on known provider commitments. Verify at thegreenwebfoundation.org

B
Carbon Budget
33th percentile
REVIEW
33th percentile
Info::
0.44g 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

0.44g

33rd percentile

Cleaner than 67% of websites

Below the Web Sustainability Guidelines target

vs Median 27% cleaner ✓
vs Target 13% cleaner ✓
B
Transfer Efficiency
84% efficient
REVIEW
84% efficient
Info::
Transfer efficiency: 84%
An estimated 298 KB (16%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 298 KB of unused JavaScript. This wasted data produces 0.07g of unnecessary CO2 per page view.
84% efficient

Total waste: 298 KB (16% of page weight)

Unused JS 298 KB

0.07g unnecessary CO2 per visit

Actual transfer 1891 KB
Theoretical minimum 1593 KB
Potential savings 298 KB (0.07g CO2)

See Deep Analysis sections above for specific optimizations.

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.
A
CO2 Per Page Load
0.44g CO2 per view
PASS
0.44g CO2 per view
Info::
0.44g CO2 per page view
This page transfers 1.8 MB, producing an estimated 0.44g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.09g, end-user device 0.34g.
Got: 0.44g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 52.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 52.5 kg of CO2 annually — equivalent to charging 6558 smartphones.
Info::
Green hosting reduces data center emissions

0.44g

Carbon Footprint per page view

Below sustainability target (0.50g)

Cleaner than 67% of websites

Sustainable Web Design model v4 · Page size: 1.8 MB

Your site
0.44g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.01g
Network
0.09g
End-user device
0.34g
At 10,000 monthly views: Monthly: 4.4 kg · Annual: 52.5 kg · ≈ 6558 smartphone charges
A+
Repeat Visit Weight
98% cached
PASS
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 32 KB (vs 1891 KB first visit). 109 of 110 resources are served from browser cache, saving 0.43g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.44g)
First visit
1891 KB
Repeat visit
32 KB

98% reduction on repeat visits

Saving 0.43g CO2 per returning visitor

109 resources served from cache · 1 resources re-downloaded

A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Kualo

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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