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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
66
GRADE
D
FIX
2
REVIEW
3
PASS
1
INFO
0
Device:
Mobile Desktop
Checks
6
1 PASS 3 REVIEW 2 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 Not identified✗CDN Varnish✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Transfer Efficiency
Action
16% efficient
FIX
16% efficient
Critical::
Transfer efficiency: 16%
An estimated 1669 KB (84%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1669 KB of unused JavaScript. This wasted data produces 0.46g of unnecessary CO2 per page view.
16% efficient

Total waste: 1669 KB (84% of page weight)

Unused JS 1669 KB

0.46g unnecessary CO2 per visit

Actual transfer 1980 KB
Theoretical minimum 311 KB
Potential savings 1669 KB (0.46g CO2)

See Deep Analysis sections above for specific optimizations.

B
CO2 Per Page Load
0.55g CO2 per view
REVIEW
0.55g CO2 per view
Info::
0.55g CO2 per page view
This page transfers 1.9 MB, producing an estimated 0.55g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.10g, network 0.09g, end-user device 0.35g.
Got: 0.55g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 65.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 65.7 kg of CO2 annually — equivalent to charging 8215 smartphones.

0.55g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 56% of websites

Sustainable Web Design model v4 · Page size: 1.9 MB

Your site
0.55g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.10g
Network
0.09g
End-user device
0.35g
At 10,000 monthly views: Monthly: 5.5 kg · Annual: 65.7 kg · ≈ 8215 smartphone charges
B
Carbon Budget
44th percentile
REVIEW
44th percentile
Info::
0.55g CO2 — below the median website (0.60g)
Better than an estimated 56% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.
Info::
Estimated 44th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.55g

44th percentile

Cleaner than 56% of websites

✗ Above the median website

vs Median 9% cleaner ✓
vs Target 10% more
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Repeat Visit Weight
90% cached
PASS
90% cached
Info::
90% reduction on repeat visits
Returning visitors download only 193 KB (vs 1980 KB first visit). 16 of 19 resources are served from browser cache, saving 0.49g CO2 per repeat visit.
Info::
Repeat visit: 0.05g CO2 (first visit: 0.55g)
First visit
1980 KB
Repeat visit
193 KB

90% reduction on repeat visits

Saving 0.49g CO2 per returning visitor

16 resources served from cache · 3 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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