https://dailychanges.domaintools.com
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
80
GRADE
B
FIX
2
REVIEW
2
PASS
3
INFO
1
Checks
83 PASS 2 REVIEW 2 FIX
DGreen HostingActionUnknownFIX
Green Hosting
ActionUnknown
Unknown
Info::
Hosting provider could not be identified
Without knowing the provider, we cannot determine their energy sourcing. Check with your hosting provider about their renewable energy commitments.
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 HostingUnable to Determine
Hosting Not identified✗CDN Not identified✗
Based on known provider commitments. Verify at thegreenwebfoundation.org
DTransfer EfficiencyAction57% efficientFIX
Transfer Efficiency
Action57% efficient
57% efficient
Warning::
Transfer efficiency: 57%
An estimated 161 KB (43%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 161 KB of unused JavaScript. This wasted data produces 0.04g of unnecessary CO2 per page view.
Total waste: 161 KB (43% of page weight)
Unused JS 161 KB
0.04g unnecessary CO2 per visit
Actual transfer 375 KB
Theoretical minimum 214 KB
Potential savings 161 KB (0.04g 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
A+CO2 Per Page Load0.10g CO2 per viewPASS
CO2 Per Page Load
0.10g CO2 per view
0.10g CO2 per view
Info::
0.10g CO2 per page view
This page transfers 0.4 MB, producing an estimated 0.10g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.02g, end-user device 0.07g.
Got: 0.10g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 12.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 12.5 kg of CO2 annually — equivalent to charging 1558 smartphones.
0.10g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 90% of websites
Sustainable Web Design model v4 · Page size: 0.4 MB
Your site
0.10g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.02g
Network
0.02g
End-user device
0.07g
At 10,000 monthly views: Monthly: 1.0 kg · Annual: 12.5 kg · ≈ 1558 smartphone charges
A+Repeat Visit Weight88% cachedPASS
Repeat Visit Weight
88% cached
88% cached
Info::
88% reduction on repeat visits
Returning visitors download only 44 KB (vs 375 KB first visit). 34 of 35 resources are served from browser cache, saving 0.09g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.10g)
First visit
375 KB
Repeat visit
44 KB
88% reduction on repeat visits
Saving 0.09g CO2 per returning visitor
34 resources served from cache · 1 resources re-downloaded
A+Carbon Budget10th percentilePASS
Carbon Budget
10th percentile
10th percentile
Info::
0.10g 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
0.10g
10th percentile
Cleaner than 90% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 83% cleaner ✓
vs Target 79% cleaner ✓
Image Optimization2 images, 10 KB total, 0 KB wastedINFO
Image Optimization
2 images, 10 KB total, 0 KB wasted
Image Optimization Audit
Total Images
2
Total Size
10 KB
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.