https://webshots.com
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
84
GRADE
B
FIX
1
REVIEW
1
PASS
4
INFO
0
Checks
64 PASS 1 REVIEW 1 FIX
DCarbon BudgetAction53th percentileFIX
Carbon Budget
Action53th percentile
53th percentile
Warning::
0.74g 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
0.74g
53rd percentile
Cleaner than 47% of websites
✗ Above the median website
vs Median 23% more
vs Target 47% more
BCO2 Per Page Load0.74g CO2 per viewREVIEW
CO2 Per Page Load
0.74g CO2 per view
0.74g CO2 per view
Info::
0.74g CO2 per page view
This page transfers 3.1 MB, producing an estimated 0.74g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.15g, end-user device 0.57g.
Got: 0.74g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 88.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 88.3 kg of CO2 annually — equivalent to charging 11037 smartphones.
Info::
Green hosting reduces data center emissions
0.74g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 47% of websites
Sustainable Web Design model v4 · Page size: 3.1 MB
Your site
0.74g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.02g
Network
0.15g
End-user device
0.57g
At 10,000 monthly views: Monthly: 7.4 kg · Annual: 88.3 kg · ≈ 11037 smartphone charges
A+Green HostingGreen (both)PASS
Green Hosting
Green (both)
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Quis Lab (Plushie App), CDN: Fastly
Info::
Quis Lab (Plushie App): Verified by the Green Web Foundation
Info::
Fastly: 100% renewable energy for edge network
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 Quis Lab (Plushie App)✓CDN Fastly✓
Quis Lab (Plushie App): Verified by the Green Web Foundation
Fastly: 100% renewable energy for edge network
Based on known provider commitments. Verify at thegreenwebfoundation.org
A+Repeat Visit Weight98% cachedPASS
Repeat Visit Weight
98% cached
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 50 KB (vs 3183 KB first visit). 69 of 76 resources are served from browser cache, saving 0.72g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.74g)
First visit
3183 KB
Repeat visit
50 KB
98% reduction on repeat visits
Saving 0.72g CO2 per returning visitor
69 resources served from cache · 7 resources re-downloaded
A+Transfer Efficiency91% efficientPASS
Transfer Efficiency
91% efficient
91% efficient
Info::
Transfer efficiency: 91%
Only 285 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 285 KB (9% of page weight)
Unused JS 285 KB
0.07g unnecessary CO2 per visit
Actual transfer 3183 KB
Theoretical minimum 2898 KB
Potential savings 285 KB (0.07g CO2)
See Deep Analysis sections above for specific optimizations.
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
Whether the site is served from green-energy infrastructure
Green Hosting
This site is hosted on green energy infrastructure
Provider: Quis Lab (Plushie App)
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.