https://bang.com
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
0
REVIEW
2
PASS
5
INFO
1
Checks
85 PASS 2 REVIEW
BCarbon Budget35th percentileREVIEW
Carbon Budget
35th percentile
35th percentile
Info::
0.46g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 65% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 35th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.46g
35th percentile
Cleaner than 65% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 24% cleaner ✓
vs Target 9% cleaner ✓
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.
ACO2 Per Page Load0.46g CO2 per viewPASS
CO2 Per Page Load
0.46g CO2 per view
0.46g CO2 per view
Info::
0.46g CO2 per page view
This page transfers 1.9 MB, producing an estimated 0.46g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.09g, end-user device 0.35g.
Got: 0.46g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 54.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 54.7 kg of CO2 annually — equivalent to charging 6839 smartphones.
Info::
Green hosting reduces data center emissions
0.46g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 65% of websites
Sustainable Web Design model v4 · Page size: 1.9 MB
Your site
0.46g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.01g
Network
0.09g
End-user device
0.35g
At 10,000 monthly views: Monthly: 4.6 kg · Annual: 54.7 kg · ≈ 6839 smartphone charges
A+Green HostingGreen (both)PASS
Green Hosting
Green (both)
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Cloudflare, CDN: Cloudflare
Info::
Cloudflare: 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 Cloudflare✓CDN Cloudflare✓
Cloudflare: 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 34 KB (vs 1972 KB first visit). 125 of 126 resources are served from browser cache, saving 0.45g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.46g)
First visit
1972 KB
Repeat visit
34 KB
98% reduction on repeat visits
Saving 0.45g CO2 per returning visitor
125 resources served from cache · 1 resources re-downloaded
A+Transfer Efficiency99% efficientPASS
Transfer Efficiency
99% efficient
99% efficient
Info::
Transfer efficiency: 99%
Only 26 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 26 KB (1% of page weight)
Unused JS 26 KB
0.01g unnecessary CO2 per visit
Actual transfer 1972 KB
Theoretical minimum 1946 KB
Potential savings 26 KB (0.01g 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: Cloudflare
Image Optimization129 images, 0 KB total, 0 KB wastedINFO
Image Optimization
129 images, 0 KB total, 0 KB wasted
Image Optimization Audit
Total Images
129
Total Size
0 KB
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.