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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::
AWS: Renewable energy varies by region; committed to 100% by 2025
Info::
AWS CloudFront: Renewable varies by edge location
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 AWS✗CDN AWS CloudFront✗

AWS: Renewable energy varies by region; committed to 100% by 2025

AWS CloudFront: Renewable varies by edge location

Based on known provider commitments. Verify at thegreenwebfoundation.org

B
CO2 Per Page Load
0.61g CO2 per view
REVIEW
0.61g CO2 per view
Info::
0.61g CO2 per page view
This page transfers 2.2 MB, producing an estimated 0.61g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.11g, network 0.11g, end-user device 0.39g.
Got: 0.61g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 73.2 kg CO2/year
With 10,000 page views per month, this page would generate approximately 73.2 kg of CO2 annually — equivalent to charging 9148 smartphones.

0.61g

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
0.61g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.11g
Network
0.11g
End-user device
0.39g
At 10,000 monthly views: Monthly: 6.1 kg · Annual: 73.2 kg · ≈ 9148 smartphone charges
B
Carbon Budget
50th percentile
REVIEW
50th percentile
Warning::
0.61g 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

0.61g

50th percentile

Cleaner than 50% of websites

✗ Above the median website

vs Median 2% more
vs Target 22% more
B
Transfer Efficiency
89% efficient
REVIEW
89% efficient
Info::
Transfer efficiency: 89%
An estimated 249 KB (11%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 249 KB of unused JavaScript. This wasted data produces 0.07g of unnecessary CO2 per page view.
89% efficient

Total waste: 249 KB (11% of page weight)

Unused JS 249 KB

0.07g unnecessary CO2 per visit

Actual transfer 2205 KB
Theoretical minimum 1955 KB
Potential savings 249 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.
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Repeat Visit Weight
95% cached
PASS
95% cached
Info::
95% reduction on repeat visits
Returning visitors download only 101 KB (vs 2205 KB first visit). 79 of 82 resources are served from browser cache, saving 0.58g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 0.61g)
First visit
2205 KB
Repeat visit
101 KB

95% reduction on repeat visits

Saving 0.58g CO2 per returning visitor

79 resources served from cache · 3 resources re-downloaded

Image Optimization
5 images, 68 KB total, 22 KB wasted
INFO

Image Optimization Audit

Total Images

5

Total Size

68 KB

Oversized

3

Wasted

22 KB

5 missing alt text 2 missing dimensions 2 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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