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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
93
GRADE
A
FIX
0
REVIEW
2
PASS
4
INFO
0
Device:
Mobile Desktop
Checks
6
4 PASS 2 REVIEW
B
Transfer Efficiency
82% efficient
REVIEW
82% efficient
Info::
Transfer efficiency: 82%
An estimated 67 KB (18%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 67 KB of unused JavaScript. This wasted data produces 0.02g of unnecessary CO2 per page view.
82% efficient

Total waste: 67 KB (18% of page weight)

Unused JS 67 KB

0.02g unnecessary CO2 per visit

Actual transfer 377 KB
Theoretical minimum 310 KB
Potential savings 67 KB (0.02g 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
0.09g CO2 per view
PASS
0.09g CO2 per view
Info::
0.09g CO2 per page view
This page transfers 0.4 MB, producing an estimated 0.09g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.00g, network 0.02g, end-user device 0.07g.
Got: 0.09g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 10.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 10.5 kg of CO2 annually — equivalent to charging 1309 smartphones.
Info::
Green hosting reduces data center emissions

0.09g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 90% of websites

Sustainable Web Design model v4 · Page size: 0.4 MB

Your site
0.09g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.00g
Network
0.02g
End-user device
0.07g
At 10,000 monthly views: Monthly: 0.9 kg · Annual: 10.5 kg · ≈ 1309 smartphone charges
A
Green Hosting
Green (cdn)
PASS
Green (cdn)
Info::
Cloudflare CDN uses renewable energy
Since most traffic is served through the CDN, the majority of data transfer energy is renewable.
Info::
Cloudflare: 100% renewable energy for global network since 2019
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 Not identified✗CDN Cloudflare✓

Cloudflare: 100% renewable energy for global network since 2019

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
98% cached
PASS
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 6 KB (vs 377 KB first visit). 10 of 12 resources are served from browser cache, saving 0.09g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 0.09g)
First visit
377 KB
Repeat visit
6 KB

98% reduction on repeat visits

Saving 0.09g CO2 per returning visitor

10 resources served from cache · 2 resources re-downloaded

A+
Carbon Budget
10th percentile
PASS
10th percentile
Info::
0.09g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 90% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 10th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.09g

10th percentile

Cleaner than 90% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 85% cleaner ✓
vs Target 83% 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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