https://coobiz.it
Sustainability
· 8 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
4
INFO
1
Checks
84 PASS 3 REVIEW
BGreen HostingGreen (hosting)REVIEW
Green Hosting
Green (hosting)
Green (hosting)
Info::
Microsoft IIS uses renewable energy
Info::
Microsoft IIS: 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 Microsoft IIS✓CDN Not identified✗
Microsoft IIS: Verified by the Green Web Foundation
Based on known provider commitments. Verify at thegreenwebfoundation.org
BTransfer Efficiency80% efficientREVIEW
Transfer Efficiency
80% efficient
80% efficient
Info::
Transfer efficiency: 80%
An estimated 301 KB (20%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 301 KB of unused JavaScript. This wasted data produces 0.07g of unnecessary CO2 per page view.
Total waste: 301 KB (20% of page weight)
Unused JS 301 KB
0.07g unnecessary CO2 per visit
Actual transfer 1491 KB
Theoretical minimum 1190 KB
Potential savings 301 KB (0.07g CO2)
See Deep Analysis sections above for specific optimizations.
CWeb Font Weight VariantsAction25 font weights loaded across 2 famil(y/ies)REVIEW
Web Font Weight Variants
Action25 font weights loaded across 2 famil(y/ies)
25 font weights loaded across 2 famil(y/ies)
Warning::
25 font weights loaded -- likely 100+ KB of unused payload
Loading 25 font weights typically transfers 200-400 KB just for fonts. Most pages legitimately use 2-3 weights (regular + bold, maybe medium). Audit which weights your stylesheet actually applies and trim the Google Fonts URL accordingly. Affected families: Archivo, Roboto.
ACO2 Per Page Load0.34g CO2 per viewPASS
CO2 Per Page Load
0.34g CO2 per view
0.34g CO2 per view
Info::
0.34g CO2 per page view
This page transfers 1.5 MB, producing an estimated 0.34g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.07g, end-user device 0.26g.
Got: 0.34g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 41.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 41.4 kg of CO2 annually — equivalent to charging 5171 smartphones.
Info::
Green hosting reduces data center emissions
0.34g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 76% of websites
Sustainable Web Design model v4 · Page size: 1.5 MB
Your site
0.34g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.01g
Network
0.07g
End-user device
0.26g
At 10,000 monthly views: Monthly: 3.4 kg · Annual: 41.4 kg · ≈ 5171 smartphone charges
A+Repeat Visit Weight99% cachedPASS
Repeat Visit Weight
99% cached
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 21 KB (vs 1491 KB first visit). 49 of 50 resources are served from browser cache, saving 0.34g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 0.34g)
First visit
1491 KB
Repeat visit
21 KB
99% reduction on repeat visits
Saving 0.34g CO2 per returning visitor
49 resources served from cache · 1 resources re-downloaded
ACarbon Budget24th percentilePASS
Carbon Budget
24th percentile
24th percentile
Info::
0.34g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 76% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 24th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.34g
24th percentile
Cleaner than 76% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 43% cleaner ✓
vs Target 31% 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 Optimization48 images, 214 KB total, 0 KB wastedINFO
Image Optimization
48 images, 214 KB total, 0 KB wasted
Image Optimization Audit
Total Images
48
Total Size
214 KB
8 missing dimensions
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.