https://crashlytics.com
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
80
GRADE
B
FIX
0
REVIEW
4
PASS
2
INFO
0
Checks
62 PASS 4 REVIEW
BCO2 Per Page Load0.55g CO2 per viewREVIEW
CO2 Per Page Load
0.55g CO2 per view
0.55g CO2 per view
Info::
0.55g CO2 per page view
This page transfers 2.3 MB, producing an estimated 0.55g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.11g, end-user device 0.43g.
Got: 0.55g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 66.5 kg CO2/year
With 10,000 page views per month, this page would generate approximately 66.5 kg of CO2 annually — equivalent to charging 8311 smartphones.
Info::
Green hosting reduces data center emissions
0.55g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 55% of websites
Sustainable Web Design model v4 · Page size: 2.3 MB
Your site
0.55g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.01g
Network
0.11g
End-user device
0.43g
At 10,000 monthly views: Monthly: 5.5 kg · Annual: 66.5 kg · ≈ 8311 smartphone charges
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::
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 Not identified✗
Google Cloud: Verified by the Green Web Foundation
Based on known provider commitments. Verify at thegreenwebfoundation.org
BCarbon Budget45th percentileREVIEW
Carbon Budget
45th percentile
45th percentile
Info::
0.55g CO2 — below the median website (0.60g)
Better than an estimated 55% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.
Info::
Estimated 45th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.55g
45th percentile
Cleaner than 55% of websites
✗ Above the median website
vs Median 8% cleaner ✓
vs Target 11% more
BTransfer Efficiency83% efficientREVIEW
Transfer Efficiency
83% efficient
83% efficient
Info::
Transfer efficiency: 83%
An estimated 396 KB (17%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 396 KB of unused JavaScript. This wasted data produces 0.09g of unnecessary CO2 per page view.
Total waste: 396 KB (17% of page weight)
Unused JS 396 KB
0.09g unnecessary CO2 per visit
Actual transfer 2397 KB
Theoretical minimum 2000 KB
Potential savings 396 KB (0.09g CO2)
See Deep Analysis sections above for specific optimizations.
A+Repeat Visit Weight96% cachedPASS
Repeat Visit Weight
96% cached
96% cached
Info::
96% reduction on repeat visits
Returning visitors download only 88 KB (vs 2397 KB first visit). 79 of 81 resources are served from browser cache, saving 0.53g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.55g)
First visit
2397 KB
Repeat visit
88 KB
96% reduction on repeat visits
Saving 0.53g CO2 per returning visitor
79 resources served from cache · 2 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.