https://sprytal.com
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
65
GRADE
D
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 Amazon Web Services✗CDN Not identified✗
Based on known provider commitments. Verify at thegreenwebfoundation.org
DCarbon BudgetAction54th percentileFIX
Carbon Budget
Action54th percentile
54th percentile
Warning::
0.77g CO2 — above the median website (0.60g)
Heavier than an estimated 46% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 54th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.77g
54th percentile
Cleaner than 46% of websites
✗ Above the median website
vs Median 28% more
vs Target 53% more
BCO2 Per Page Load0.77g CO2 per viewREVIEW
CO2 Per Page Load
0.77g CO2 per view
0.77g CO2 per view
Info::
0.77g CO2 per page view
This page transfers 2.7 MB, producing an estimated 0.77g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.14g, network 0.13g, end-user device 0.49g.
Got: 0.77g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 92.0 kg CO2/year
With 10,000 page views per month, this page would generate approximately 92.0 kg of CO2 annually — equivalent to charging 11505 smartphones.
0.77g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 46% of websites
Sustainable Web Design model v4 · Page size: 2.7 MB
Your site
0.77g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.14g
Network
0.13g
End-user device
0.49g
At 10,000 monthly views: Monthly: 7.7 kg · Annual: 92.0 kg · ≈ 11505 smartphone charges
CTransfer EfficiencyAction74% efficientREVIEW
Transfer Efficiency
Action74% efficient
74% efficient
Warning::
Transfer efficiency: 74%
An estimated 709 KB (26%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 709 KB of unused JavaScript. This wasted data produces 0.20g of unnecessary CO2 per page view.
Total waste: 709 KB (26% of page weight)
Unused JS 709 KB
0.20g unnecessary CO2 per visit
Actual transfer 2773 KB
Theoretical minimum 2064 KB
Potential savings 709 KB (0.20g CO2)
See Deep Analysis sections above for specific optimizations.
CWeb Font Weight VariantsAction8 font weights loaded across 2 famil(y/ies)REVIEW
Web Font Weight Variants
Action8 font weights loaded across 2 famil(y/ies)
8 font weights loaded across 2 famil(y/ies)
Warning::
8 font weights loaded -- likely 100+ KB of unused payload
Loading 8 font weights typically transfers 200-400 KB just for fonts. Most pages legitimately use 2-3 weights (regular + bold, maybe medium). Audit which weights your stylesheet actually applies and trim the Google Fonts URL accordingly. Affected families: Inter, Manrope.
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 Weight97% cachedPASS
Repeat Visit Weight
97% cached
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 89 KB (vs 2773 KB first visit). 85 of 88 resources are served from browser cache, saving 0.74g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.77g)
First visit
2773 KB
Repeat visit
89 KB
97% reduction on repeat visits
Saving 0.74g CO2 per returning visitor
85 resources served from cache · 3 resources re-downloaded
Image Optimization2 images, 25 KB total, 0 KB wastedINFO
Image Optimization
2 images, 25 KB total, 0 KB wasted
Image Optimization Audit
Total Images
2
Total Size
25 KB
1 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.