https://stripe.com
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
75
GRADE
C
FIX
1
REVIEW
5
PASS
1
INFO
1
Checks
81 PASS 5 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 Amazon Web Services✗CDN Not identified✗
Based on known provider commitments. Verify at thegreenwebfoundation.org
BCO2 Per Page Load0.51g CO2 per viewREVIEW
CO2 Per Page Load
0.51g CO2 per view
0.51g CO2 per view
Info::
0.51g CO2 per page view
This page transfers 1.8 MB, producing an estimated 0.51g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.09g, network 0.09g, end-user device 0.33g.
Got: 0.51g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 61.2 kg CO2/year
With 10,000 page views per month, this page would generate approximately 61.2 kg of CO2 annually — equivalent to charging 7644 smartphones.
0.51g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 60% of websites
Sustainable Web Design model v4 · Page size: 1.8 MB
Your site
0.51g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.09g
Network
0.09g
End-user device
0.33g
At 10,000 monthly views: Monthly: 5.1 kg · Annual: 61.2 kg · ≈ 7644 smartphone charges
BCarbon Budget40th percentileREVIEW
Carbon Budget
40th percentile
40th percentile
Info::
0.51g CO2 — below the median website (0.60g)
Better than an estimated 60% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.
Info::
Estimated 40th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.51g
40th percentile
Cleaner than 60% of websites
✗ Above the median website
vs Median 15% cleaner ✓
vs Target 2% more
BTransfer Efficiency88% efficientREVIEW
Transfer Efficiency
88% efficient
88% efficient
Info::
Transfer efficiency: 88%
An estimated 218 KB (12%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 218 KB of unused JavaScript. This wasted data produces 0.06g of unnecessary CO2 per page view.
Total waste: 218 KB (12% of page weight)
Unused JS 218 KB
0.06g unnecessary CO2 per visit
Actual transfer 1842 KB
Theoretical minimum 1623 KB
Potential savings 218 KB (0.06g 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.
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 Weight91% cachedPASS
Repeat Visit Weight
91% cached
91% cached
Info::
91% reduction on repeat visits
Returning visitors download only 171 KB (vs 1842 KB first visit). 112 of 115 resources are served from browser cache, saving 0.46g CO2 per repeat visit.
Info::
Repeat visit: 0.05g CO2 (first visit: 0.51g)
First visit
1842 KB
Repeat visit
171 KB
91% reduction on repeat visits
Saving 0.46g CO2 per returning visitor
112 resources served from cache · 3 resources re-downloaded
Image Optimization42 images, 0 KB total, 0 KB wastedINFO
Image Optimization
42 images, 0 KB total, 0 KB wasted
Image Optimization Audit
Total Images
42
Total Size
0 KB
Oversized
4
34 missing alt text 2 missing dimensions
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.