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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
65% efficient
REVIEW
65% efficient
Warning::
Transfer efficiency: 65%
An estimated 425 KB (35%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 425 KB of unused JavaScript. This wasted data produces 0.12g of unnecessary CO2 per page view.
65% efficient

Total waste: 425 KB (35% of page weight)

Unused JS 425 KB

0.12g unnecessary CO2 per visit

Actual transfer 1226 KB
Theoretical minimum 800 KB
Potential savings 425 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
0.34g CO2 per view
PASS
0.34g CO2 per view
Info::
0.34g CO2 per page view
This page transfers 1.2 MB, producing an estimated 0.34g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.06g, network 0.06g, end-user device 0.22g.
Got: 0.34g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 40.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 40.7 kg of CO2 annually — equivalent to charging 5088 smartphones.

0.34g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 77% of websites

Sustainable Web Design model v4 · Page size: 1.2 MB

Your site
0.34g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.06g
Network
0.06g
End-user device
0.22g
At 10,000 monthly views: Monthly: 3.4 kg · Annual: 40.7 kg · ≈ 5088 smartphone charges
A+
Repeat Visit Weight
92% cached
PASS
92% cached
Info::
92% reduction on repeat visits
Returning visitors download only 100 KB (vs 1226 KB first visit). 72 of 75 resources are served from browser cache, saving 0.31g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 0.34g)
First visit
1226 KB
Repeat visit
100 KB

92% reduction on repeat visits

Saving 0.31g CO2 per returning visitor

72 resources served from cache · 3 resources re-downloaded

A
Carbon Budget
23th percentile
PASS
23th percentile
Info::
0.34g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 77% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 23th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.34g

23rd percentile

Cleaner than 77% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 43% cleaner ✓
vs Target 32% 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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