https://borlabs.io
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
86
GRADE
B
FIX
0
REVIEW
2
PASS
4
INFO
0
Checks
64 PASS 2 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
BTransfer Efficiency87% efficientREVIEW
Transfer Efficiency
87% efficient
87% efficient
Info::
Transfer efficiency: 87%
An estimated 153 KB (13%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 153 KB of unused JavaScript. This wasted data produces 0.04g of unnecessary CO2 per page view.
Total waste: 153 KB (13% of page weight)
Unused JS 153 KB
0.04g unnecessary CO2 per visit
Actual transfer 1163 KB
Theoretical minimum 1009 KB
Potential savings 153 KB (0.04g CO2)
See Deep Analysis sections above for specific optimizations.
ACO2 Per Page Load0.27g CO2 per viewPASS
CO2 Per Page Load
0.27g CO2 per view
0.27g CO2 per view
Info::
0.27g CO2 per page view
This page transfers 1.1 MB, producing an estimated 0.27g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.06g, end-user device 0.21g.
Got: 0.27g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 32.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 32.3 kg of CO2 annually — equivalent to charging 4034 smartphones.
Info::
Green hosting reduces data center emissions
0.27g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 84% of websites
Sustainable Web Design model v4 · Page size: 1.1 MB
Your site
0.27g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.01g
Network
0.06g
End-user device
0.21g
At 10,000 monthly views: Monthly: 2.7 kg · Annual: 32.3 kg · ≈ 4034 smartphone charges
A+Repeat Visit Weight98% cachedPASS
Repeat Visit Weight
98% cached
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 22 KB (vs 1163 KB first visit). 84 of 85 resources are served from browser cache, saving 0.26g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.27g)
First visit
1163 KB
Repeat visit
22 KB
98% reduction on repeat visits
Saving 0.26g CO2 per returning visitor
84 resources served from cache · 1 resources re-downloaded
ACarbon Budget16th percentilePASS
Carbon Budget
16th percentile
16th percentile
Info::
0.27g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 84% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 16th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.27g
16th percentile
Cleaner than 84% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 55% cleaner ✓
vs Target 46% cleaner ✓
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.