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 BudgetAction51th percentileFIX
Carbon Budget
Action51th percentile
51th percentile
Warning::
0.64g CO2 — above the median website (0.60g)
Heavier than an estimated 49% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 51th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.64g
51st percentile
Cleaner than 49% of websites
✗ Above the median website
vs Median 6% more
vs Target 27% more
BCO2 Per Page Load0.64g CO2 per viewREVIEW
CO2 Per Page Load
0.64g CO2 per view
0.64g CO2 per view
Info::
0.64g CO2 per page view
This page transfers 2.2 MB, producing an estimated 0.64g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.12g, network 0.11g, end-user device 0.41g.
Got: 0.64g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 76.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 76.3 kg of CO2 annually — equivalent to charging 9541 smartphones.
0.64g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 49% of websites
Sustainable Web Design model v4 · Page size: 2.2 MB
Your site
0.64g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.12g
Network
0.11g
End-user device
0.41g
At 10,000 monthly views: Monthly: 6.4 kg · Annual: 76.3 kg · ≈ 9541 smartphone charges
CTransfer EfficiencyAction69% efficientREVIEW
Transfer Efficiency
Action69% efficient
69% efficient
Warning::
Transfer efficiency: 69%
An estimated 710 KB (31%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 710 KB of unused JavaScript. This wasted data produces 0.20g of unnecessary CO2 per page view.
Total waste: 710 KB (31% of page weight)
Unused JS 710 KB
0.20g unnecessary CO2 per visit
Actual transfer 2299 KB
Theoretical minimum 1589 KB
Potential savings 710 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 Weight96% cachedPASS
Repeat Visit Weight
96% cached
96% cached
Info::
96% reduction on repeat visits
Returning visitors download only 89 KB (vs 2299 KB first visit). 85 of 88 resources are served from browser cache, saving 0.61g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.64g)
First visit
2299 KB
Repeat visit
89 KB
96% reduction on repeat visits
Saving 0.61g 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.