https://alembika.com
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
68
GRADE
D
FIX
2
REVIEW
2
PASS
3
INFO
1
Checks
83 PASS 2 REVIEW 2 FIX
FCO2 Per Page LoadAction1.77g CO2 per viewFIX
CO2 Per Page Load
Action1.77g CO2 per view
1.77g CO2 per view
Warning::
1.77g CO2 per page view
This page transfers 7.5 MB, producing an estimated 1.77g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.04g, network 0.37g, end-user device 1.36g.
Got: 1.77g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 212.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 212.1 kg of CO2 annually — equivalent to charging 26514 smartphones.
Info::
Green hosting reduces data center emissions
1.77g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 17% of websites
Sustainable Web Design model v4 · Page size: 7.5 MB
Your site
1.77g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.04g
Network
0.37g
End-user device
1.36g
At 10,000 monthly views: Monthly: 17.7 kg · Annual: 212.1 kg · ≈ 26514 smartphone charges
FCarbon BudgetAction83th percentileFIX
Carbon Budget
Action83th percentile
83th percentile
Warning::
1.77g CO2 — above the median website (0.60g)
Heavier than an estimated 17% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 83th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
1.77g
83rd percentile
Cleaner than 17% of websites
✗ Above the median website
vs Median 195% more
vs Target 254% more
BTransfer Efficiency76% efficientREVIEW
Transfer Efficiency
76% efficient
76% efficient
Info::
Transfer efficiency: 76%
An estimated 1869 KB (24%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 1869 KB of unused JavaScript. This wasted data produces 0.43g of unnecessary CO2 per page view.
Total waste: 1869 KB (24% of page weight)
Unused JS 1869 KB
0.43g unnecessary CO2 per visit
Actual transfer 7647 KB
Theoretical minimum 5778 KB
Potential savings 1869 KB (0.43g 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.
A+Green HostingGreen (both)PASS
Green Hosting
Green (both)
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Amazon Web Services, CDN: Cloudflare
Info::
Amazon Web Services: Verified by the Green Web Foundation
Info::
Cloudflare: 100% renewable energy for global network since 2019
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 Amazon Web Services✓CDN Cloudflare✓
Amazon Web Services: Verified by the Green Web Foundation
Cloudflare: 100% renewable energy for global network since 2019
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 143 KB (vs 7647 KB first visit). 528 of 534 resources are served from browser cache, saving 1.73g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 1.77g)
First visit
7647 KB
Repeat visit
143 KB
98% reduction on repeat visits
Saving 1.73g CO2 per returning visitor
528 resources served from cache · 6 resources re-downloaded
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: Cloudflare
Image Optimization44 images, 506 KB total, 4 KB wastedINFO
Image Optimization
44 images, 506 KB total, 4 KB wasted
Image Optimization Audit
Total Images
44
Total Size
506 KB
Oversized
1
Wasted
4 KB
38 missing dimensions 8 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.