https://tcpdf.org
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
83
GRADE
B
FIX
0
REVIEW
3
PASS
3
INFO
0
Checks
63 PASS 3 REVIEW
BGreen HostingGreen (hosting)REVIEW
Green Hosting
Green (hosting)
Green (hosting)
Info::
Hetzner Online GmbH uses renewable energy
Info::
Hetzner Online GmbH: Verified by the Green Web Foundation
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 Hetzner Online GmbH✓CDN Not identified✗
Hetzner Online GmbH: Verified by the Green Web Foundation
Based on known provider commitments. Verify at thegreenwebfoundation.org
BCarbon Budget31th percentileREVIEW
Carbon Budget
31th percentile
31th percentile
Info::
0.42g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 69% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 31th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.42g
31st percentile
Cleaner than 69% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 31% cleaner ✓
vs Target 17% cleaner ✓
BTransfer Efficiency87% efficientREVIEW
Transfer Efficiency
87% efficient
87% efficient
Info::
Transfer efficiency: 87%
An estimated 241 KB (13%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 241 KB of unused JavaScript. This wasted data produces 0.06g of unnecessary CO2 per page view.
Total waste: 241 KB (13% of page weight)
Unused JS 241 KB
0.06g unnecessary CO2 per visit
Actual transfer 1797 KB
Theoretical minimum 1556 KB
Potential savings 241 KB (0.06g CO2)
See Deep Analysis sections above for specific optimizations.
ACO2 Per Page Load0.42g CO2 per viewPASS
CO2 Per Page Load
0.42g CO2 per view
0.42g CO2 per view
Info::
0.42g CO2 per page view
This page transfers 1.8 MB, producing an estimated 0.42g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.09g, end-user device 0.32g.
Got: 0.42g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 49.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 49.9 kg of CO2 annually — equivalent to charging 6233 smartphones.
Info::
Green hosting reduces data center emissions
0.42g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 69% of websites
Sustainable Web Design model v4 · Page size: 1.8 MB
Your site
0.42g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.01g
Network
0.09g
End-user device
0.32g
At 10,000 monthly views: Monthly: 4.2 kg · Annual: 49.9 kg · ≈ 6233 smartphone charges
A+Repeat Visit Weight99% cachedPASS
Repeat Visit Weight
99% cached
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 22 KB (vs 1797 KB first visit). 61 of 67 resources are served from browser cache, saving 0.41g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.42g)
First visit
1797 KB
Repeat visit
22 KB
99% reduction on repeat visits
Saving 0.41g CO2 per returning visitor
61 resources served from cache · 6 resources re-downloaded
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
Whether the site is served from green-energy infrastructure
Green Hosting
This site is hosted on green energy infrastructure
Provider: Hetzner Online GmbH
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.