https://healio.com
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
66
GRADE
D
FIX
2
REVIEW
3
PASS
1
INFO
0
Checks
61 PASS 3 REVIEW 2 FIX
DGreen HostingActionUnknownFIX
Green Hosting
ActionUnknown
Unknown
Info::
Hosting provider could not be identified
Without knowing the provider, we cannot determine their energy sourcing. Check with your hosting provider about their renewable energy commitments.
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 HostingUnable to Determine
Hosting Not identified✗CDN Not identified✗
Based on known provider commitments. Verify at thegreenwebfoundation.org
DCarbon BudgetAction53th percentileFIX
Carbon Budget
Action53th percentile
53th percentile
Warning::
0.71g 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
0.71g
53rd percentile
Cleaner than 47% of websites
✗ Above the median website
vs Median 18% more
vs Target 41% more
BCO2 Per Page Load0.71g CO2 per viewREVIEW
CO2 Per Page Load
0.71g CO2 per view
0.71g CO2 per view
Info::
0.71g CO2 per page view
This page transfers 2.5 MB, producing an estimated 0.71g 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: 0.71g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 84.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 84.6 kg of CO2 annually — equivalent to charging 10578 smartphones.
0.71g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 47% of websites
Sustainable Web Design model v4 · Page size: 2.5 MB
Your site
0.71g
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: 7.1 kg · Annual: 84.6 kg · ≈ 10578 smartphone charges
CTransfer EfficiencyAction69% efficientREVIEW
Transfer Efficiency
Action69% efficient
69% efficient
Warning::
Transfer efficiency: 69%
An estimated 786 KB (31%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 786 KB of unused JavaScript. This wasted data produces 0.22g of unnecessary CO2 per page view.
Total waste: 786 KB (31% of page weight)
Unused JS 786 KB
0.22g unnecessary CO2 per visit
Actual transfer 2550 KB
Theoretical minimum 1763 KB
Potential savings 786 KB (0.22g CO2)
See Deep Analysis sections above for specific optimizations.
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
A+Repeat Visit Weight95% cachedPASS
Repeat Visit Weight
95% cached
95% cached
Info::
95% reduction on repeat visits
Returning visitors download only 139 KB (vs 2550 KB first visit). 113 of 116 resources are served from browser cache, saving 0.67g CO2 per repeat visit.
Info::
Repeat visit: 0.04g CO2 (first visit: 0.71g)
First visit
2550 KB
Repeat visit
139 KB
95% reduction on repeat visits
Saving 0.67g CO2 per returning visitor
113 resources served from cache · 3 resources re-downloaded
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.