https://sblob.it
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
90
GRADE
A
FIX
1
REVIEW
1
PASS
5
INFO
1
Checks
85 PASS 1 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 HTTP Server✗CDN Not identified✗
Based on known provider commitments. Verify at thegreenwebfoundation.org
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+CO2 Per Page Load0.05g CO2 per viewPASS
CO2 Per Page Load
0.05g CO2 per view
0.05g CO2 per view
Info::
0.05g CO2 per page view
This page transfers 0.2 MB, producing an estimated 0.05g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.01g, end-user device 0.03g.
Got: 0.05g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 6.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 6.1 kg of CO2 annually — equivalent to charging 763 smartphones.
0.05g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 90% of websites
Sustainable Web Design model v4 · Page size: 0.2 MB
Your site
0.05g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.01g
Network
0.01g
End-user device
0.03g
At 10,000 monthly views: Monthly: 0.5 kg · Annual: 6.1 kg · ≈ 763 smartphone charges
A+Repeat Visit Weight96% cachedPASS
Repeat Visit Weight
96% cached
96% cached
Info::
96% reduction on repeat visits
Returning visitors download only 7 KB (vs 183 KB first visit). 16 of 17 resources are served from browser cache, saving 0.05g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 0.05g)
First visit
183 KB
Repeat visit
7 KB
96% reduction on repeat visits
Saving 0.05g CO2 per returning visitor
16 resources served from cache · 1 resources re-downloaded
A+Carbon Budget10th percentilePASS
Carbon Budget
10th percentile
10th percentile
Info::
0.05g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 90% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 10th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.05g
10th percentile
Cleaner than 90% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 92% cleaner ✓
vs Target 90% cleaner ✓
A+Transfer Efficiency100% efficientPASS
Transfer Efficiency
100% efficient
100% efficient
Info::
Transfer efficiency: 100%
Only 0 KB of potential savings identified. Your page is well-optimized for size.
Actual transfer 183 KB
Theoretical minimum 183 KB
See Deep Analysis sections above for specific optimizations.
A+Web Font Weight Variants2 font weights loaded across 1 famil(y/ies) -- reasonablePASS
Web Font Weight Variants
2 font weights loaded across 1 famil(y/ies) -- reasonable
2 font weights loaded across 1 famil(y/ies) -- reasonable
Info::
2 font weight(s) loaded across 1 famil(y/ies)
Image Optimization2 images, 11 KB total, 5 KB wastedINFO
Image Optimization
2 images, 11 KB total, 5 KB wasted
Image Optimization Audit
Total Images
2
Total Size
11 KB
Oversized
1
Wasted
5 KB
2 missing dimensions
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.