https://tibzi.com
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
95
GRADE
A
FIX
0
REVIEW
4
PASS
3
INFO
1
Checks
83 PASS 4 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
BRepeat Visit Weight76% cachedREVIEW
Repeat Visit Weight
76% cached
76% cached
Info::
76% reduction on repeat visits
Returning visitors download only 152 KB (vs 624 KB first visit). 49 of 51 resources are served from browser cache, saving 0.11g CO2 per repeat visit.
Info::
Repeat visit: 0.04g CO2 (first visit: 0.14g)
First visit
624 KB
Repeat visit
152 KB
76% reduction on repeat visits
Saving 0.11g CO2 per returning visitor
49 resources served from cache · 2 resources re-downloaded
BTransfer Efficiency87% efficientREVIEW
Transfer Efficiency
87% efficient
87% efficient
Info::
Transfer efficiency: 87%
An estimated 81 KB (13%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 81 KB of unused JavaScript. This wasted data produces 0.02g of unnecessary CO2 per page view.
Total waste: 81 KB (13% of page weight)
Unused JS 81 KB
0.02g unnecessary CO2 per visit
Actual transfer 624 KB
Theoretical minimum 542 KB
Potential savings 81 KB (0.02g CO2)
See Deep Analysis sections above for specific optimizations.
BWeb Font Weight VariantsNo detectable Google Fonts weightsREVIEW
Web Font Weight Variants
No detectable Google Fonts weights
No detectable Google Fonts weights
Info::
No detectable Google Fonts weights
The analyzer detects font weights via Google Fonts URL parameters (~70% of font-using sites). Self-hosted fonts and non-Google CDN fonts aren't visible to URL-based detection. If you self-host fonts, manually audit how many @font-face weights you ship -- 2-3 weights per family is typically enough; 5+ is usually unused payload.
A+CO2 Per Page Load0.14g CO2 per viewPASS
CO2 Per Page Load
0.14g CO2 per view
0.14g CO2 per view
Info::
0.14g CO2 per page view
This page transfers 0.6 MB, producing an estimated 0.14g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.00g, network 0.03g, end-user device 0.11g.
Got: 0.14g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 17.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 17.3 kg of CO2 annually — equivalent to charging 2163 smartphones.
Info::
Green hosting reduces data center emissions
0.14g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 90% of websites
Sustainable Web Design model v4 · Page size: 0.6 MB
Your site
0.14g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.00g
Network
0.03g
End-user device
0.11g
At 10,000 monthly views: Monthly: 1.4 kg · Annual: 17.3 kg · ≈ 2163 smartphone charges
A+Carbon Budget10th percentilePASS
Carbon Budget
10th percentile
10th percentile
Info::
0.14g 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
0.14g
10th percentile
Cleaner than 90% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 76% cleaner ✓
vs Target 71% 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
Image Optimization2 images, 0 KB total, 0 KB wastedINFO
Image Optimization
2 images, 0 KB total, 0 KB wasted
Image Optimization Audit
Total Images
2
Total Size
0 KB
2 missing dimensions 1 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.