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Sustainability

· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
71
GRADE
C
FIX
1
REVIEW
5
PASS
1
INFO
1
Device:
Mobile Desktop
Checks
8
1 PASS 5 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 Amazon Web Services✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

B
CO2 Per Page Load
0.59g CO2 per view
REVIEW
0.59g CO2 per view
Info::
0.59g CO2 per page view
This page transfers 2.1 MB, producing an estimated 0.59g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.11g, network 0.10g, end-user device 0.38g.
Got: 0.59g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 71.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 71.4 kg of CO2 annually — equivalent to charging 8923 smartphones.

0.59g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 51% of websites

Sustainable Web Design model v4 · Page size: 2.1 MB

Your site
0.59g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.11g
Network
0.10g
End-user device
0.38g
At 10,000 monthly views: Monthly: 5.9 kg · Annual: 71.4 kg · ≈ 8923 smartphone charges
B
Carbon Budget
49th percentile
REVIEW
49th percentile
Info::
0.59g CO2 — below the median website (0.60g)
Better than an estimated 51% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.
Info::
Estimated 49th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.59g

49th percentile

Cleaner than 51% of websites

✗ Above the median website

vs Median 1% cleaner ✓
vs Target 19% more
C
Transfer Efficiency
Action
61% efficient
REVIEW
61% efficient
Warning::
Transfer efficiency: 61%
An estimated 842 KB (39%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 842 KB of unused JavaScript. This wasted data produces 0.23g of unnecessary CO2 per page view.
61% efficient

Total waste: 842 KB (39% of page weight)

Unused JS 842 KB

0.23g unnecessary CO2 per visit

Actual transfer 2151 KB
Theoretical minimum 1308 KB
Potential savings 842 KB (0.23g 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+
Repeat Visit Weight
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 13 KB (vs 2151 KB first visit). 53 of 54 resources are served from browser cache, saving 0.59g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 0.59g)
First visit
2151 KB
Repeat visit
13 KB

99% reduction on repeat visits

Saving 0.59g CO2 per returning visitor

53 resources served from cache · 1 resources re-downloaded

Image Optimization
8 images, 14 KB total, 13 KB wasted
INFO

Image Optimization Audit

Total Images

8

Total Size

14 KB

Oversized

4

Wasted

13 KB

2 missing alt text 6 missing dimensions 4 missing lazy loading
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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