https://en.wikipedia.org/wiki/Octopus
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
1
REVIEW
2
PASS
4
INFO
1
Checks
84 PASS 2 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::
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 Apache Traffic Server✗CDN Not identified✗
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
ACO2 Per Page Load0.36g CO2 per viewPASS
CO2 Per Page Load
0.36g CO2 per view
0.36g CO2 per view
Info::
0.36g CO2 per page view
This page transfers 1.3 MB, producing an estimated 0.36g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.07g, network 0.06g, end-user device 0.23g.
Got: 0.36g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 43.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 43.4 kg of CO2 annually — equivalent to charging 5423 smartphones.
0.36g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 74% of websites
Sustainable Web Design model v4 · Page size: 1.3 MB
Your site
0.36g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.07g
Network
0.06g
End-user device
0.23g
At 10,000 monthly views: Monthly: 3.6 kg · Annual: 43.4 kg · ≈ 5423 smartphone charges
A+Repeat Visit Weight91% cachedPASS
Repeat Visit Weight
91% cached
91% cached
Info::
91% reduction on repeat visits
Returning visitors download only 111 KB (vs 1307 KB first visit). 101 of 102 resources are served from browser cache, saving 0.33g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 0.36g)
First visit
1307 KB
Repeat visit
111 KB
91% reduction on repeat visits
Saving 0.33g CO2 per returning visitor
101 resources served from cache · 1 resources re-downloaded
ACarbon Budget26th percentilePASS
Carbon Budget
26th percentile
26th percentile
Info::
0.36g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 74% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 26th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.36g
26th percentile
Cleaner than 74% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 40% cleaner ✓
vs Target 28% cleaner ✓
A+Transfer Efficiency94% efficientPASS
Transfer Efficiency
94% efficient
94% efficient
Info::
Transfer efficiency: 94%
Only 81 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 81 KB (6% of page weight)
Unused JS 81 KB
0.02g unnecessary CO2 per visit
Actual transfer 1307 KB
Theoretical minimum 1225 KB
Potential savings 81 KB (0.02g CO2)
See Deep Analysis sections above for specific optimizations.
Image Optimization55 images, 591 KB total, 51 KB wastedINFO
Image Optimization
55 images, 591 KB total, 51 KB wasted
Image Optimization Audit
Total Images
55
Total Size
591 KB
Oversized
13
Wasted
51 KB
20 missing alt text 1 missing dimensions 51 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.