https://heise.de
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
92
GRADE
A
FIX
0
REVIEW
2
PASS
4
INFO
0
Checks
64 PASS 2 REVIEW
BGreen HostingGreen (hosting)REVIEW
Green Hosting
Green (hosting)
Green (hosting)
Info::
Plus.line AG uses renewable energy
Info::
Plus.line AG: 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 Plus.line AG✓CDN Not identified✗
Plus.line AG: Verified by the Green Web Foundation
Based on known provider commitments. Verify at thegreenwebfoundation.org
BTransfer Efficiency84% efficientREVIEW
Transfer Efficiency
84% efficient
84% efficient
Info::
Transfer efficiency: 84%
An estimated 132 KB (16%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 132 KB of unused JavaScript. This wasted data produces 0.03g of unnecessary CO2 per page view.
Total waste: 132 KB (16% of page weight)
Unused JS 132 KB
0.03g unnecessary CO2 per visit
Actual transfer 847 KB
Theoretical minimum 715 KB
Potential savings 132 KB (0.03g CO2)
See Deep Analysis sections above for specific optimizations.
A+CO2 Per Page Load0.20g CO2 per viewPASS
CO2 Per Page Load
0.20g CO2 per view
0.20g CO2 per view
Info::
0.20g CO2 per page view
This page transfers 0.8 MB, producing an estimated 0.20g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.00g, network 0.04g, end-user device 0.15g.
Got: 0.20g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 23.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 23.5 kg of CO2 annually — equivalent to charging 2938 smartphones.
Info::
Green hosting reduces data center emissions
0.20g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 90% of websites
Sustainable Web Design model v4 · Page size: 0.8 MB
Your site
0.20g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.00g
Network
0.04g
End-user device
0.15g
At 10,000 monthly views: Monthly: 2.0 kg · Annual: 23.5 kg · ≈ 2938 smartphone charges
A+Repeat Visit Weight84% cachedPASS
Repeat Visit Weight
84% cached
84% cached
Info::
84% reduction on repeat visits
Returning visitors download only 131 KB (vs 847 KB first visit). 79 of 82 resources are served from browser cache, saving 0.17g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 0.20g)
First visit
847 KB
Repeat visit
131 KB
84% reduction on repeat visits
Saving 0.17g CO2 per returning visitor
79 resources served from cache · 3 resources re-downloaded
A+Carbon Budget10th percentilePASS
Carbon Budget
10th percentile
10th percentile
Info::
0.20g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 90% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 10th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.20g
10th percentile
Cleaner than 90% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 67% cleaner ✓
vs Target 61% 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: Plus.line AG
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.