https://logo-index.com
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
79
GRADE
C
FIX
0
REVIEW
5
PASS
2
INFO
1
Checks
82 PASS 5 REVIEW
BCO2 Per Page Load0.56g CO2 per viewREVIEW
CO2 Per Page Load
0.56g CO2 per view
0.56g CO2 per view
Info::
0.56g CO2 per page view
This page transfers 2.4 MB, producing an estimated 0.56g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.12g, end-user device 0.43g.
Got: 0.56g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 67.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 67.8 kg of CO2 annually — equivalent to charging 8474 smartphones.
Info::
Green hosting reduces data center emissions
0.56g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 54% of websites
Sustainable Web Design model v4 · Page size: 2.4 MB
Your site
0.56g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.01g
Network
0.12g
End-user device
0.43g
At 10,000 monthly views: Monthly: 5.6 kg · Annual: 67.8 kg · ≈ 8474 smartphone charges
BCarbon Budget46th percentileREVIEW
Carbon Budget
46th percentile
46th percentile
Info::
0.56g CO2 — below the median website (0.60g)
Better than an estimated 54% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.
Info::
Estimated 46th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.56g
46th percentile
Cleaner than 54% of websites
✗ Above the median website
vs Median 6% cleaner ✓
vs Target 13% more
CTransfer EfficiencyAction73% efficientREVIEW
Transfer Efficiency
Action73% efficient
73% efficient
Warning::
Transfer efficiency: 73%
An estimated 661 KB (27%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 661 KB of unused JavaScript. This wasted data produces 0.15g of unnecessary CO2 per page view.
Total waste: 661 KB (27% of page weight)
Unused JS 661 KB
0.15g unnecessary CO2 per visit
Actual transfer 2444 KB
Theoretical minimum 1782 KB
Potential savings 661 KB (0.15g 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.
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
AGreen HostingGreen (cdn)PASS
Green Hosting
Green (cdn)
Green (cdn)
Info::
Cloudflare CDN uses renewable energy
Since most traffic is served through the CDN, the majority of data transfer energy is renewable.
Info::
Cloudflare: 100% renewable energy for global network since 2019
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 Not identified✗CDN Cloudflare✓
Cloudflare: 100% renewable energy for global network since 2019
Based on known provider commitments. Verify at thegreenwebfoundation.org
A+Repeat Visit Weight95% cachedPASS
Repeat Visit Weight
95% cached
95% cached
Info::
95% reduction on repeat visits
Returning visitors download only 124 KB (vs 2444 KB first visit). 227 of 230 resources are served from browser cache, saving 0.54g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 0.56g)
First visit
2444 KB
Repeat visit
124 KB
95% reduction on repeat visits
Saving 0.54g CO2 per returning visitor
227 resources served from cache · 3 resources re-downloaded
Image Optimization55 images, 2 KB total, 0 KB wastedINFO
Image Optimization
55 images, 2 KB total, 0 KB wasted
Image Optimization Audit
Total Images
55
Total Size
2 KB
13 missing dimensions 25 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.