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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
75
GRADE
C
FIX
1
REVIEW
5
PASS
1
INFO
1
Device:
Mobile Desktop
Checks
8
1 PASS 5 REVIEW 1 FIX
D
Green Hosting
Action
Not green
FIX
Not green
Info::
No confirmed renewable energy commitment detected
Consider providers like Cloudflare, Google Cloud, or Vercel that match 100% of their energy use with renewables.
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 HostingNot Green Hosted
Hosting Amazon Web Services✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

B
CO2 Per Page Load
0.54g CO2 per view
REVIEW
0.54g CO2 per view
Info::
0.54g CO2 per page view
This page transfers 1.9 MB, producing an estimated 0.54g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.10g, network 0.09g, end-user device 0.35g.
Got: 0.54g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 64.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 64.6 kg of CO2 annually — equivalent to charging 8073 smartphones.

0.54g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 57% of websites

Sustainable Web Design model v4 · Page size: 1.9 MB

Your site
0.54g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.10g
Network
0.09g
End-user device
0.35g
At 10,000 monthly views: Monthly: 5.4 kg · Annual: 64.6 kg · ≈ 8073 smartphone charges
B
Carbon Budget
43th percentile
REVIEW
43th percentile
Info::
0.54g CO2 — below the median website (0.60g)
Better than an estimated 57% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.
Info::
Estimated 43th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.54g

43rd percentile

Cleaner than 57% of websites

✗ Above the median website

vs Median 10% cleaner ✓
vs Target 8% more
B
Transfer Efficiency
83% efficient
REVIEW
83% efficient
Info::
Transfer efficiency: 83%
An estimated 332 KB (17%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 332 KB of unused JavaScript. This wasted data produces 0.09g of unnecessary CO2 per page view.
83% efficient

Total waste: 332 KB (17% of page weight)

Unused JS 332 KB

0.09g unnecessary CO2 per visit

Actual transfer 1946 KB
Theoretical minimum 1613 KB
Potential savings 332 KB (0.09g 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.
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Repeat Visit Weight
98% cached
PASS
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 48 KB (vs 1946 KB first visit). 167 of 168 resources are served from browser cache, saving 0.52g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.54g)
First visit
1946 KB
Repeat visit
48 KB

98% reduction on repeat visits

Saving 0.52g CO2 per returning visitor

167 resources served from cache · 1 resources re-downloaded

Image Optimization
17 images, 38 KB total, 2 KB wasted
INFO

Image Optimization Audit

Total Images

17

Total Size

38 KB

Oversized

2

Wasted

2 KB

8 missing alt text 11 missing dimensions 16 missing lazy loading
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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