https://www.kapuli.ai
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
85
GRADE
B
FIX
1
REVIEW
3
PASS
3
INFO
1
Checks
83 PASS 3 REVIEW 1 FIX
DGreen HostingActionNot greenFIX
Green Hosting
ActionNot green
Not green
Info::
No confirmed renewable energy commitment detected
Consider providers like Cloudflare, Google Cloud, or Vercel that match 100% of their energy use with renewables.
Info::
AWS: Renewable energy varies by region; committed to 100% by 2025
Info::
AWS CloudFront: Renewable varies by edge location
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 HostingNot Green Hosted
Hosting AWS✗CDN AWS CloudFront✗
AWS: Renewable energy varies by region; committed to 100% by 2025
AWS CloudFront: Renewable varies by edge location
Based on known provider commitments. Verify at thegreenwebfoundation.org
BTransfer Efficiency83% efficientREVIEW
Transfer Efficiency
83% efficient
83% efficient
Info::
Transfer efficiency: 83%
An estimated 119 KB (17%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 119 KB of unused JavaScript. This wasted data produces 0.03g of unnecessary CO2 per page view.
Total waste: 119 KB (17% of page weight)
Unused JS 119 KB
0.03g unnecessary CO2 per visit
Actual transfer 709 KB
Theoretical minimum 590 KB
Potential savings 119 KB (0.03g 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 Load0.20g CO2 per viewPASS
CO2 Per Page Load
0.20g CO2 per view
0.20g CO2 per view
Info::
0.20g CO2 per page view
This page transfers 0.7 MB, producing an estimated 0.20g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.04g, network 0.03g, end-user device 0.13g.
Got: 0.20g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 23.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 23.6 kg of CO2 annually — equivalent to charging 2943 smartphones.
0.20g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 90% of websites
Sustainable Web Design model v4 · Page size: 0.7 MB
Your site
0.20g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.04g
Network
0.03g
End-user device
0.13g
At 10,000 monthly views: Monthly: 2.0 kg · Annual: 23.6 kg · ≈ 2943 smartphone charges
A+Repeat Visit Weight97% cachedPASS
Repeat Visit Weight
97% cached
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 23 KB (vs 709 KB first visit). 38 of 39 resources are served from browser cache, saving 0.19g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.20g)
First visit
709 KB
Repeat visit
23 KB
97% reduction on repeat visits
Saving 0.19g CO2 per returning visitor
38 resources served from cache · 1 resources re-downloaded
A+Carbon Budget10th percentilePASS
Carbon Budget
10th percentile
10th percentile
Info::
0.20g 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
0.20g
10th percentile
Cleaner than 90% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 67% cleaner ✓
vs Target 61% cleaner ✓
Image Optimization37 images, 198 KB total, 0 KB wastedINFO
Image Optimization
37 images, 198 KB total, 0 KB wasted
Image Optimization Audit
Total Images
37
Total Size
198 KB
33 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.