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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
82
GRADE
B
FIX
0
REVIEW
3
PASS
3
INFO
0
Device:
Mobile Desktop
Checks
6
3 PASS 3 REVIEW
B
Green Hosting
Green (hosting)
REVIEW
Green (hosting)
Info::
Next.js uses renewable energy
Info::
Next.js: Verified by the Green Web Foundation
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 Hosting✓ Green Hosted
Hosting Next.js✓CDN Not identified✗

Next.js: Verified by the Green Web Foundation

Based on known provider commitments. Verify at thegreenwebfoundation.org

B
Carbon Budget
33th percentile
REVIEW
33th percentile
Info::
0.43g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 67% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 33th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.43g

33rd percentile

Cleaner than 67% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 28% cleaner ✓
vs Target 13% cleaner ✓
C
Transfer Efficiency
Action
74% efficient
REVIEW
74% efficient
Warning::
Transfer efficiency: 74%
An estimated 485 KB (26%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 485 KB of unused JavaScript. This wasted data produces 0.11g of unnecessary CO2 per page view.
74% efficient

Total waste: 485 KB (26% of page weight)

Unused JS 485 KB

0.11g unnecessary CO2 per visit

Actual transfer 1879 KB
Theoretical minimum 1393 KB
Potential savings 485 KB (0.11g CO2)

See Deep Analysis sections above for specific optimizations.

A
CO2 Per Page Load
0.43g CO2 per view
PASS
0.43g CO2 per view
Info::
0.43g CO2 per page view
This page transfers 1.8 MB, producing an estimated 0.43g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.09g, end-user device 0.33g.
Got: 0.43g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 52.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 52.1 kg of CO2 annually — equivalent to charging 6515 smartphones.
Info::
Green hosting reduces data center emissions

0.43g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 67% of websites

Sustainable Web Design model v4 · Page size: 1.8 MB

Your site
0.43g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.01g
Network
0.09g
End-user device
0.33g
At 10,000 monthly views: Monthly: 4.3 kg · Annual: 52.1 kg · ≈ 6515 smartphone charges
A+
Repeat Visit Weight
97% cached
PASS
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 55 KB (vs 1879 KB first visit). 78 of 79 resources are served from browser cache, saving 0.42g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.43g)
First visit
1879 KB
Repeat visit
55 KB

97% reduction on repeat visits

Saving 0.42g CO2 per returning visitor

78 resources served from cache · 1 resources re-downloaded

A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Scaleway

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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