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Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
78
GRADE
C
FIX
1
REVIEW
2
PASS
3
INFO
0
Device:
Mobile Desktop
Checks
6
3 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::
DigitalOcean: Some data centers use renewable energy; no global commitment
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 DigitalOcean✗CDN Not identified✗

DigitalOcean: Some data centers use renewable energy; no global commitment

Based on known provider commitments. Verify at thegreenwebfoundation.org

B
Transfer Efficiency
87% efficient
REVIEW
87% efficient
Info::
Transfer efficiency: 87%
An estimated 118 KB (13%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 118 KB of unused JavaScript. This wasted data produces 0.03g of unnecessary CO2 per page view.
87% efficient

Total waste: 118 KB (13% of page weight)

Unused JS 118 KB

0.03g unnecessary CO2 per visit

Actual transfer 920 KB
Theoretical minimum 801 KB
Potential savings 118 KB (0.03g CO2)

See Deep Analysis sections above for specific optimizations.

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: 30.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 30.5 kg of CO2 annually — equivalent to charging 3817 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: 30.5 kg · ≈ 3817 smartphone charges
A+
Repeat Visit Weight
97% cached
PASS
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 31 KB (vs 920 KB first visit). 81 of 83 resources are served from browser cache, saving 0.25g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.25g)
First visit
920 KB
Repeat visit
31 KB

97% reduction on repeat visits

Saving 0.25g CO2 per returning visitor

81 resources served from cache · 2 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 49% cleaner ✓
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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