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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
84
GRADE
B
FIX
1
REVIEW
3
PASS
3
INFO
1
Device:
Mobile Desktop
Checks
8
3 PASS 3 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

C
Transfer Efficiency
Action
73% efficient
REVIEW
73% efficient
Warning::
Transfer efficiency: 73%
An estimated 309 KB (27%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 309 KB of unused JavaScript. This wasted data produces 0.09g of unnecessary CO2 per page view.
73% efficient

Total waste: 309 KB (27% of page weight)

Unused JS 309 KB

0.09g unnecessary CO2 per visit

Actual transfer 1157 KB
Theoretical minimum 847 KB
Potential savings 309 KB (0.09g CO2)

See Deep Analysis sections above for specific optimizations.

B
Web Font Weight Variants
5 font weights loaded across 1 famil(y/ies)
REVIEW
5 font weights loaded across 1 famil(y/ies)
Info::
5 font weights loaded -- review whether all are used
5+ weights for a single page is often more than needed. Compare against the actual font-weight CSS rules in your stylesheets; trim weights that aren't applied to any element. Affected families: Inter.
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
CO2 Per Page Load
0.32g CO2 per view
PASS
0.32g CO2 per view
Info::
0.32g CO2 per page view
This page transfers 1.1 MB, producing an estimated 0.32g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.06g, network 0.06g, end-user device 0.21g.
Got: 0.32g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 38.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 38.4 kg of CO2 annually — equivalent to charging 4800 smartphones.

0.32g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 78% of websites

Sustainable Web Design model v4 · Page size: 1.1 MB

Your site
0.32g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.06g
Network
0.06g
End-user device
0.21g
At 10,000 monthly views: Monthly: 3.2 kg · Annual: 38.4 kg · ≈ 4800 smartphone charges
A+
Repeat Visit Weight
94% cached
PASS
94% cached
Info::
94% reduction on repeat visits
Returning visitors download only 65 KB (vs 1157 KB first visit). 107 of 108 resources are served from browser cache, saving 0.30g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.32g)
First visit
1157 KB
Repeat visit
65 KB

94% reduction on repeat visits

Saving 0.30g CO2 per returning visitor

107 resources served from cache · 1 resources re-downloaded

A
Carbon Budget
22th percentile
PASS
22th percentile
Info::
0.32g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 78% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 22th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.32g

22nd percentile

Cleaner than 78% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 47% cleaner ✓
vs Target 36% cleaner ✓
Image Optimization
132 images, 0 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

132

Total Size

0 KB

Oversized

10

130 missing dimensions 51 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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