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Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
74
GRADE
C
FIX
1
REVIEW
3
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 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::
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 Next.js✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

B
Carbon Budget
37th percentile
REVIEW
37th percentile
Info::
0.47g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 63% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 37th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.47g

37th percentile

Cleaner than 63% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 22% cleaner ✓
vs Target 6% cleaner ✓
B
Transfer Efficiency
75% efficient
REVIEW
75% efficient
Info::
Transfer efficiency: 75%
An estimated 420 KB (25%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 420 KB of unused JavaScript. This wasted data produces 0.12g of unnecessary CO2 per page view.
75% efficient

Total waste: 420 KB (25% of page weight)

Unused JS 420 KB

0.12g unnecessary CO2 per visit

Actual transfer 1700 KB
Theoretical minimum 1280 KB
Potential savings 420 KB (0.12g CO2)

See Deep Analysis sections above for specific optimizations.

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
0.47g CO2 per view
PASS
0.47g CO2 per view
Info::
0.47g CO2 per page view
This page transfers 1.7 MB, producing an estimated 0.47g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.09g, network 0.08g, end-user device 0.30g.
Got: 0.47g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 56.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 56.4 kg of CO2 annually — equivalent to charging 7055 smartphones.

0.47g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 63% of websites

Sustainable Web Design model v4 · Page size: 1.7 MB

Your site
0.47g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.09g
Network
0.08g
End-user device
0.30g
At 10,000 monthly views: Monthly: 4.7 kg · Annual: 56.4 kg · ≈ 7055 smartphone charges
A+
Repeat Visit Weight
93% cached
PASS
93% cached
Info::
93% reduction on repeat visits
Returning visitors download only 118 KB (vs 1700 KB first visit). 118 of 131 resources are served from browser cache, saving 0.44g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 0.47g)
First visit
1700 KB
Repeat visit
118 KB

93% reduction on repeat visits

Saving 0.44g CO2 per returning visitor

118 resources served from cache · 13 resources re-downloaded

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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