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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

B
Repeat Visit Weight
77% cached
REVIEW
77% cached
Info::
77% reduction on repeat visits
Returning visitors download only 152 KB (vs 652 KB first visit). 32 of 34 resources are served from browser cache, saving 0.14g CO2 per repeat visit.
Info::
Repeat visit: 0.04g CO2 (first visit: 0.18g)
First visit
652 KB
Repeat visit
152 KB

77% reduction on repeat visits

Saving 0.14g CO2 per returning visitor

32 resources served from cache · 2 resources re-downloaded

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
0.18g CO2 per view
PASS
0.18g CO2 per view
Info::
0.18g CO2 per page view
This page transfers 0.6 MB, producing an estimated 0.18g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.03g, network 0.03g, end-user device 0.12g.
Got: 0.18g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 21.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 21.7 kg of CO2 annually — equivalent to charging 2706 smartphones.

0.18g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 90% of websites

Sustainable Web Design model v4 · Page size: 0.6 MB

Your site
0.18g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.03g
Network
0.03g
End-user device
0.12g
At 10,000 monthly views: Monthly: 1.8 kg · Annual: 21.7 kg · ≈ 2706 smartphone charges
A+
Carbon Budget
10th percentile
PASS
10th percentile
Info::
0.18g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 90% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 10th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.18g

10th percentile

Cleaner than 90% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 70% cleaner ✓
vs Target 64% cleaner ✓
A+
Transfer Efficiency
100% efficient
PASS
100% efficient
Info::
Transfer efficiency: 100%
Only 0 KB of potential savings identified. Your page is well-optimized for size.
100% efficient
Actual transfer 652 KB
Theoretical minimum 652 KB

See Deep Analysis sections above for specific optimizations.

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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