https://www.calme.it
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
78
GRADE
C
FIX
2
REVIEW
3
PASS
2
INFO
1
Checks
82 PASS 3 REVIEW 2 FIX
DCO2 Per Page LoadAction1.02g CO2 per viewFIX
CO2 Per Page Load
Action1.02g CO2 per view
1.02g CO2 per view
Warning::
1.02g CO2 per page view
This page transfers 4.3 MB, producing an estimated 1.02g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.03g, network 0.21g, end-user device 0.78g.
Got: 1.02g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 122.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 122.0 kg of CO2 annually — equivalent to charging 15247 smartphones.
Info::
Green hosting reduces data center emissions
1.02g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 39% of websites
Sustainable Web Design model v4 · Page size: 4.3 MB
Your site
1.02g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.03g
Network
0.21g
End-user device
0.78g
At 10,000 monthly views: Monthly: 10.2 kg · Annual: 122.0 kg · ≈ 15247 smartphone charges
DCarbon BudgetAction61th percentileFIX
Carbon Budget
Action61th percentile
61th percentile
Warning::
1.02g CO2 — above the median website (0.60g)
Heavier than an estimated 39% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 61th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
1.02g
61st percentile
Cleaner than 39% of websites
✗ Above the median website
vs Median 69% more
vs Target 103% more
BGreen HostingGreen (hosting)REVIEW
Green Hosting
Green (hosting)
Green (hosting)
Info::
Aruba.it uses renewable energy
Info::
Aruba.it: Listed in the Green Web Foundation dataset
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 Aruba.it✓CDN Not identified✗
Aruba.it: Listed in the Green Web Foundation dataset
Based on known provider commitments. Verify at thegreenwebfoundation.org
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.
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
ActionWhether the site is served from green-energy infrastructure
Green Hosting
No green hosting detected
A+Repeat Visit Weight99% cachedPASS
Repeat Visit Weight
99% cached
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 47 KB (vs 4397 KB first visit). 119 of 120 resources are served from browser cache, saving 1.01g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 1.02g)
First visit
4397 KB
Repeat visit
47 KB
99% reduction on repeat visits
Saving 1.01g CO2 per returning visitor
119 resources served from cache · 1 resources re-downloaded
A+Transfer Efficiency95% efficientPASS
Transfer Efficiency
95% efficient
95% efficient
Info::
Transfer efficiency: 95%
Only 211 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 211 KB (5% of page weight)
Unused JS 211 KB
0.05g unnecessary CO2 per visit
Actual transfer 4397 KB
Theoretical minimum 4185 KB
Potential savings 211 KB (0.05g CO2)
See Deep Analysis sections above for specific optimizations.
Image Optimization10 images, 202 KB total, 116 KB wastedINFO
Image Optimization
10 images, 202 KB total, 116 KB wasted
Image Optimization Audit
Total Images
10
Total Size
202 KB
Oversized
2
Wasted
116 KB
5 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.