https://duckduckgo.com
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
71
GRADE
C
FIX
2
REVIEW
4
PASS
1
INFO
1
Checks
81 PASS 4 REVIEW 2 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 Next.js✗CDN Not identified✗
Based on known provider commitments. Verify at thegreenwebfoundation.org
DCarbon BudgetAction53th percentileFIX
Carbon Budget
Action53th percentile
53th percentile
Warning::
0.73g CO2 — above the median website (0.60g)
Heavier than an estimated 47% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 53th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.73g
53rd percentile
Cleaner than 47% of websites
✗ Above the median website
vs Median 22% more
vs Target 47% more
BCO2 Per Page Load0.73g CO2 per viewREVIEW
CO2 Per Page Load
0.73g CO2 per view
0.73g CO2 per view
Info::
0.73g CO2 per page view
This page transfers 2.6 MB, producing an estimated 0.73g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.14g, network 0.13g, end-user device 0.47g.
Got: 0.73g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 88.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 88.0 kg of CO2 annually — equivalent to charging 10997 smartphones.
0.73g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 47% of websites
Sustainable Web Design model v4 · Page size: 2.6 MB
Your site
0.73g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.14g
Network
0.13g
End-user device
0.47g
At 10,000 monthly views: Monthly: 7.3 kg · Annual: 88.0 kg · ≈ 10997 smartphone charges
CTransfer EfficiencyAction75% efficientREVIEW
Transfer Efficiency
Action75% efficient
75% efficient
Warning::
Transfer efficiency: 75%
An estimated 674 KB (25%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 674 KB of unused JavaScript. This wasted data produces 0.19g of unnecessary CO2 per page view.
Total waste: 674 KB (25% of page weight)
Unused JS 674 KB
0.19g unnecessary CO2 per visit
Actual transfer 2651 KB
Theoretical minimum 1976 KB
Potential savings 674 KB (0.19g 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+Repeat Visit Weight98% cachedPASS
Repeat Visit Weight
98% cached
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 59 KB (vs 2651 KB first visit). 139 of 140 resources are served from browser cache, saving 0.72g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.73g)
First visit
2651 KB
Repeat visit
59 KB
98% reduction on repeat visits
Saving 0.72g CO2 per returning visitor
139 resources served from cache · 1 resources re-downloaded
Image Optimization67 images, 368 KB total, 32 KB wastedINFO
Image Optimization
67 images, 368 KB total, 32 KB wasted
Image Optimization Audit
Total Images
67
Total Size
368 KB
Oversized
9
Wasted
32 KB
51 missing dimensions 66 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.