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Sustainability

· 7 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
87
GRADE
B
FIX
0
REVIEW
3
PASS
4
INFO
0
Device:
Mobile Desktop
Checks
7
4 PASS 3 REVIEW
B
Transfer Efficiency
82% efficient
REVIEW
82% efficient
Info::
Transfer efficiency: 82%
An estimated 291 KB (18%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 291 KB of unused JavaScript. This wasted data produces 0.07g of unnecessary CO2 per page view.
82% efficient

Total waste: 291 KB (18% of page weight)

Unused JS 291 KB

0.07g unnecessary CO2 per visit

Actual transfer 1616 KB
Theoretical minimum 1325 KB
Potential savings 291 KB (0.07g CO2)

See Deep Analysis sections above for specific optimizations.

B
Web Font Weight Variants
No detectable Google Fonts weights
REVIEW
No detectable Google Fonts weights
Info::
No detectable Google Fonts weights
The analyzer detects font weights via Google Fonts URL parameters (~70% of font-using sites). Self-hosted fonts and non-Google CDN fonts aren't visible to URL-based detection. If you self-host fonts, manually audit how many @font-face weights you ship -- 2-3 weights per family is typically enough; 5+ is usually unused payload.
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
0.37g CO2 per view
PASS
0.37g CO2 per view
Info::
0.37g CO2 per page view
This page transfers 1.6 MB, producing an estimated 0.37g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.08g, end-user device 0.29g.
Got: 0.37g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 44.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 44.8 kg of CO2 annually — equivalent to charging 5605 smartphones.
Info::
Green hosting reduces data center emissions

0.37g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 73% of websites

Sustainable Web Design model v4 · Page size: 1.6 MB

Your site
0.37g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.01g
Network
0.08g
End-user device
0.29g
At 10,000 monthly views: Monthly: 3.7 kg · Annual: 44.8 kg · ≈ 5605 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
100% cached
PASS
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 2 KB (vs 1616 KB first visit). 87 of 88 resources are served from browser cache, saving 0.37g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 0.37g)
First visit
1616 KB
Repeat visit
2 KB

100% reduction on repeat visits

Saving 0.37g CO2 per returning visitor

87 resources served from cache · 1 resources re-downloaded

A
Carbon Budget
27th percentile
PASS
27th percentile
Info::
0.37g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 73% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 27th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.37g

27th percentile

Cleaner than 73% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 38% cleaner ✓
vs Target 25% 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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