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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
2
PASS
3
INFO
0
Device:
Mobile Desktop
Checks
6
3 PASS 2 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

C
Transfer Efficiency
Action
66% efficient
REVIEW
66% efficient
Warning::
Transfer efficiency: 66%
An estimated 260 KB (34%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 260 KB of unused JavaScript. This wasted data produces 0.07g of unnecessary CO2 per page view.
66% efficient

Total waste: 260 KB (34% of page weight)

Unused JS 260 KB

0.07g unnecessary CO2 per visit

Actual transfer 768 KB
Theoretical minimum 508 KB
Potential savings 260 KB (0.07g 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
0.21g CO2 per view
PASS
0.21g CO2 per view
Info::
0.21g CO2 per page view
This page transfers 0.8 MB, producing an estimated 0.21g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.04g, network 0.04g, end-user device 0.14g.
Got: 0.21g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 25.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 25.5 kg of CO2 annually — equivalent to charging 3189 smartphones.

0.21g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 89% of websites

Sustainable Web Design model v4 · Page size: 0.8 MB

Your site
0.21g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.04g
Network
0.04g
End-user device
0.14g
At 10,000 monthly views: Monthly: 2.1 kg · Annual: 25.5 kg · ≈ 3189 smartphone charges
A+
Repeat Visit Weight
95% cached
PASS
95% cached
Info::
95% reduction on repeat visits
Returning visitors download only 38 KB (vs 768 KB first visit). 27 of 28 resources are served from browser cache, saving 0.20g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.21g)
First visit
768 KB
Repeat visit
38 KB

95% reduction on repeat visits

Saving 0.20g CO2 per returning visitor

27 resources served from cache · 1 resources re-downloaded

A
Carbon Budget
11th percentile
PASS
11th percentile
Info::
0.21g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 89% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 11th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.21g

11th percentile

Cleaner than 89% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 65% cleaner ✓
vs Target 57% cleaner ✓
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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