https://spotify.com
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
72
GRADE
C
FIX
2
REVIEW
2
PASS
2
INFO
0
Checks
62 PASS 2 REVIEW 2 FIX
DCO2 Per Page LoadAction1.31g CO2 per viewFIX
CO2 Per Page Load
Action1.31g CO2 per view
1.31g CO2 per view
Warning::
1.31g CO2 per page view
This page transfers 5.5 MB, producing an estimated 1.31g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.03g, network 0.27g, end-user device 1.01g.
Got: 1.31g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 157.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 157.4 kg of CO2 annually — equivalent to charging 19678 smartphones.
Info::
Green hosting reduces data center emissions
1.31g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 30% of websites
Sustainable Web Design model v4 · Page size: 5.5 MB
Your site
1.31g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.03g
Network
0.27g
End-user device
1.01g
At 10,000 monthly views: Monthly: 13.1 kg · Annual: 157.4 kg · ≈ 19678 smartphone charges
DCarbon BudgetAction70th percentileFIX
Carbon Budget
Action70th percentile
70th percentile
Warning::
1.31g CO2 — above the median website (0.60g)
Heavier than an estimated 30% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 70th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
1.31g
70th percentile
Cleaner than 30% of websites
✗ Above the median website
vs Median 119% more
vs Target 162% more
BGreen HostingGreen (hosting)REVIEW
Green Hosting
Green (hosting)
Green (hosting)
Info::
Google Cloud uses renewable energy
Info::
Google Cloud: Verified by the Green Web Foundation
Info::
Google Cloud CDN: Inherits Google Cloud regional renewable mix
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 Google Cloud✓CDN Google Cloud CDN✗
Google Cloud: Verified by the Green Web Foundation
Google Cloud CDN: Inherits Google Cloud regional renewable mix
Based on known provider commitments. Verify at thegreenwebfoundation.org
BTransfer Efficiency88% efficientREVIEW
Transfer Efficiency
88% efficient
88% efficient
Info::
Transfer efficiency: 88%
An estimated 669 KB (12%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 669 KB of unused JavaScript. This wasted data produces 0.15g of unnecessary CO2 per page view.
Total waste: 669 KB (12% of page weight)
Unused JS 669 KB
0.15g unnecessary CO2 per visit
Actual transfer 5675 KB
Theoretical minimum 5006 KB
Potential savings 669 KB (0.15g CO2)
See Deep Analysis sections above for specific optimizations.
A+Repeat Visit Weight100% cachedPASS
Repeat Visit Weight
100% cached
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 22 KB (vs 5675 KB first visit). 156 of 157 resources are served from browser cache, saving 1.31g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 1.31g)
First visit
5675 KB
Repeat visit
22 KB
100% reduction on repeat visits
Saving 1.31g CO2 per returning visitor
156 resources served from cache · 1 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: Google Cloud
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.