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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
68
GRADE
D
FIX
2
REVIEW
4
PASS
1
INFO
0
Device:
Mobile Desktop
Checks
7
1 PASS 4 REVIEW 2 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::
Akamai: Committed to 50% renewable by 2030
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 Not identified✗CDN Akamai✗

Akamai: Committed to 50% renewable by 2030

Based on known provider commitments. Verify at thegreenwebfoundation.org

D
Carbon Budget
Action
52th percentile
FIX
52th percentile
Warning::
0.70g CO2 — above the median website (0.60g)
Heavier than an estimated 48% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 52th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.70g

52nd percentile

Cleaner than 48% of websites

✗ Above the median website

vs Median 17% more
vs Target 40% more
B
CO2 Per Page Load
0.70g CO2 per view
REVIEW
0.70g CO2 per view
Info::
0.70g CO2 per page view
This page transfers 2.5 MB, producing an estimated 0.70g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.13g, network 0.12g, end-user device 0.45g.
Got: 0.70g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 83.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 83.9 kg of CO2 annually — equivalent to charging 10489 smartphones.

0.70g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 48% of websites

Sustainable Web Design model v4 · Page size: 2.5 MB

Your site
0.70g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.13g
Network
0.12g
End-user device
0.45g
At 10,000 monthly views: Monthly: 7.0 kg · Annual: 83.9 kg · ≈ 10489 smartphone charges
C
Transfer Efficiency
Action
68% efficient
REVIEW
68% efficient
Warning::
Transfer efficiency: 68%
An estimated 815 KB (32%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 815 KB of unused JavaScript. This wasted data produces 0.23g of unnecessary CO2 per page view.
68% efficient

Total waste: 815 KB (32% of page weight)

Unused JS 815 KB

0.23g unnecessary CO2 per visit

Actual transfer 2528 KB
Theoretical minimum 1713 KB
Potential savings 815 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
92% cached
PASS
92% cached
Info::
92% reduction on repeat visits
Returning visitors download only 192 KB (vs 2528 KB first visit). 60 of 65 resources are served from browser cache, saving 0.65g CO2 per repeat visit.
Info::
Repeat visit: 0.05g CO2 (first visit: 0.70g)
First visit
2528 KB
Repeat visit
192 KB

92% reduction on repeat visits

Saving 0.65g CO2 per returning visitor

60 resources served from cache · 5 resources re-downloaded

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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