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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
3
PASS
3
INFO
1
Device:
Mobile Desktop
Checks
8
3 PASS 3 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
Transfer Efficiency
82% efficient
REVIEW
82% efficient
Info::
Transfer efficiency: 82%
An estimated 42 KB (18%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 42 KB of unused JavaScript. This wasted data produces 0.01g of unnecessary CO2 per page view.
82% efficient

Total waste: 42 KB (18% of page weight)

Unused JS 42 KB

0.01g unnecessary CO2 per visit

Actual transfer 234 KB
Theoretical minimum 192 KB
Potential savings 42 KB (0.01g 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
0.06g CO2 per view
PASS
0.06g CO2 per view
Info::
0.06g CO2 per page view
This page transfers 0.2 MB, producing an estimated 0.06g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.01g, end-user device 0.04g.
Got: 0.06g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 7.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 7.8 kg of CO2 annually — equivalent to charging 974 smartphones.

0.06g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 90% of websites

Sustainable Web Design model v4 · Page size: 0.2 MB

Your site
0.06g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.01g
Network
0.01g
End-user device
0.04g
At 10,000 monthly views: Monthly: 0.6 kg · Annual: 7.8 kg · ≈ 974 smartphone charges
A+
Repeat Visit Weight
92% cached
PASS
92% cached
Info::
92% reduction on repeat visits
Returning visitors download only 18 KB (vs 234 KB first visit). 16 of 18 resources are served from browser cache, saving 0.06g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.06g)
First visit
234 KB
Repeat visit
18 KB

92% reduction on repeat visits

Saving 0.06g CO2 per returning visitor

16 resources served from cache · 2 resources re-downloaded

A+
Carbon Budget
10th percentile
PASS
10th percentile
Info::
0.06g 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

0.06g

10th percentile

Cleaner than 90% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 89% cleaner ✓
vs Target 87% cleaner ✓
Image Optimization
20 images, 52 KB total, 41 KB wasted
INFO

Image Optimization Audit

Total Images

20

Total Size

52 KB

Oversized

1

Wasted

41 KB

1 missing dimensions 1 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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