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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
85
GRADE
B
FIX
1
REVIEW
2
PASS
4
INFO
1
Device:
Mobile Desktop
Checks
8
4 PASS 2 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 Apache HTTP Server✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

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
0.25g CO2 per view
PASS
0.25g CO2 per view
Info::
0.25g CO2 per page view
This page transfers 0.9 MB, producing an estimated 0.25g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.05g, network 0.04g, end-user device 0.16g.
Got: 0.25g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 30.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 30.1 kg of CO2 annually — equivalent to charging 3761 smartphones.

0.25g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 85% of websites

Sustainable Web Design model v4 · Page size: 0.9 MB

Your site
0.25g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.05g
Network
0.04g
End-user device
0.16g
At 10,000 monthly views: Monthly: 2.5 kg · Annual: 30.1 kg · ≈ 3761 smartphone charges
A+
Repeat Visit Weight
93% cached
PASS
93% cached
Info::
93% reduction on repeat visits
Returning visitors download only 60 KB (vs 906 KB first visit). 868 of 869 resources are served from browser cache, saving 0.23g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.25g)
First visit
906 KB
Repeat visit
60 KB

93% reduction on repeat visits

Saving 0.23g CO2 per returning visitor

868 resources served from cache · 1 resources re-downloaded

A
Carbon Budget
15th percentile
PASS
15th percentile
Info::
0.25g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 85% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 15th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.25g

15th percentile

Cleaner than 85% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 58% cleaner ✓
vs Target 50% cleaner ✓
A+
Transfer Efficiency
100% efficient
PASS
100% efficient
Info::
Transfer efficiency: 100%
Only 0 KB of potential savings identified. Your page is well-optimized for size.
100% efficient
Actual transfer 906 KB
Theoretical minimum 906 KB

See Deep Analysis sections above for specific optimizations.

Image Optimization
200 images, 44 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

200

Total Size

44 KB

196 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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