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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
71
GRADE
C
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
53th percentile
FIX
53th percentile
Warning::
0.72g CO2 — above the median website (0.60g)
Heavier than an estimated 47% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 53th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.72g

53rd percentile

Cleaner than 47% of websites

✗ Above the median website

vs Median 21% more
vs Target 45% more
B
CO2 Per Page Load
0.72g CO2 per view
REVIEW
0.72g CO2 per view
Info::
0.72g CO2 per page view
This page transfers 2.6 MB, producing an estimated 0.72g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.13g, network 0.13g, end-user device 0.46g.
Got: 0.72g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 86.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 86.9 kg of CO2 annually — equivalent to charging 10863 smartphones.

0.72g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 47% of websites

Sustainable Web Design model v4 · Page size: 2.6 MB

Your site
0.72g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.13g
Network
0.13g
End-user device
0.46g
At 10,000 monthly views: Monthly: 7.2 kg · Annual: 86.9 kg · ≈ 10863 smartphone charges
B
Transfer Efficiency
76% efficient
REVIEW
76% efficient
Info::
Transfer efficiency: 76%
An estimated 632 KB (24%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 632 KB of unused JavaScript. This wasted data produces 0.17g of unnecessary CO2 per page view.
76% efficient

Total waste: 632 KB (24% of page weight)

Unused JS 632 KB

0.17g unnecessary CO2 per visit

Actual transfer 2618 KB
Theoretical minimum 1986 KB
Potential savings 632 KB (0.17g 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 25 KB (vs 2618 KB first visit). 118 of 119 resources are served from browser cache, saving 0.72g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.72g)
First visit
2618 KB
Repeat visit
25 KB

99% reduction on repeat visits

Saving 0.72g CO2 per returning visitor

118 resources served from cache · 1 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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