https://uservoice.com
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
91
GRADE
A
FIX
0
REVIEW
1
PASS
5
INFO
0
Checks
65 PASS 1 REVIEW
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
ActionWhether the site is served from green-energy infrastructure
Green Hosting
No green hosting detected
ACO2 Per Page Load0.26g CO2 per viewPASS
CO2 Per Page Load
0.26g CO2 per view
0.26g CO2 per view
Info::
0.26g CO2 per page view
This page transfers 1.1 MB, producing an estimated 0.26g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.05g, end-user device 0.20g.
Got: 0.26g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 30.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 30.8 kg of CO2 annually — equivalent to charging 3850 smartphones.
Info::
Green hosting reduces data center emissions
0.26g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 85% of websites
Sustainable Web Design model v4 · Page size: 1.1 MB
Your site
0.26g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.01g
Network
0.05g
End-user device
0.20g
At 10,000 monthly views: Monthly: 2.6 kg · Annual: 30.8 kg · ≈ 3850 smartphone charges
AGreen HostingGreen (cdn)PASS
Green Hosting
Green (cdn)
Green (cdn)
Info::
Cloudflare CDN uses renewable energy
Since most traffic is served through the CDN, the majority of data transfer energy is renewable.
Info::
Cloudflare: 100% renewable energy for global network since 2019
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 Hosting✓ Green Hosted
Hosting Not identified✗CDN Cloudflare✓
Cloudflare: 100% renewable energy for global network since 2019
Based on known provider commitments. Verify at thegreenwebfoundation.org
A+Repeat Visit Weight99% cachedPASS
Repeat Visit Weight
99% cached
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 10 KB (vs 1110 KB first visit). 73 of 74 resources are served from browser cache, saving 0.25g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 0.26g)
First visit
1110 KB
Repeat visit
10 KB
99% reduction on repeat visits
Saving 0.25g CO2 per returning visitor
73 resources served from cache · 1 resources re-downloaded
ACarbon Budget15th percentilePASS
Carbon Budget
15th percentile
15th percentile
Info::
0.26g 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
0.26g
15th percentile
Cleaner than 85% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 57% cleaner ✓
vs Target 49% cleaner ✓
A+Transfer Efficiency93% efficientPASS
Transfer Efficiency
93% efficient
93% efficient
Info::
Transfer efficiency: 93%
Only 75 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 75 KB (7% of page weight)
Unused JS 75 KB
0.02g unnecessary CO2 per visit
Actual transfer 1110 KB
Theoretical minimum 1034 KB
Potential savings 75 KB (0.02g CO2)
See Deep Analysis sections above for specific optimizations.
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.