https://symfony.com
Sustainability
· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
100
GRADE
A+
FIX
0
REVIEW
0
PASS
6
INFO
0
Checks
66 PASS
A+CO2 Per Page Load0.05g CO2 per viewPASS
CO2 Per Page Load
0.05g CO2 per view
0.05g CO2 per view
Info::
0.05g CO2 per page view
This page transfers 0.2 MB, producing an estimated 0.05g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.00g, network 0.01g, end-user device 0.04g.
Got: 0.05g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 6.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 6.4 kg of CO2 annually — equivalent to charging 797 smartphones.
Info::
Green hosting reduces data center emissions
0.05g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 90% of websites
Sustainable Web Design model v4 · Page size: 0.2 MB
Your site
0.05g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.00g
Network
0.01g
End-user device
0.04g
At 10,000 monthly views: Monthly: 0.5 kg · Annual: 6.4 kg · ≈ 797 smartphone charges
A+Green HostingGreen (both)PASS
Green Hosting
Green (both)
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Platform.sh, CDN: Cloudflare
Info::
Platform.sh: 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 Platform.sh✓CDN Cloudflare✓
Platform.sh: 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 Weight85% cachedPASS
Repeat Visit Weight
85% cached
85% cached
Info::
85% reduction on repeat visits
Returning visitors download only 34 KB (vs 230 KB first visit). 37 of 38 resources are served from browser cache, saving 0.05g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.05g)
First visit
230 KB
Repeat visit
34 KB
85% reduction on repeat visits
Saving 0.05g CO2 per returning visitor
37 resources served from cache · 1 resources re-downloaded
A+Carbon Budget10th percentilePASS
Carbon Budget
10th percentile
10th percentile
Info::
0.05g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 90% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 10th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.05g
10th percentile
Cleaner than 90% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 91% cleaner ✓
vs Target 89% cleaner ✓
A+Transfer Efficiency100% efficientPASS
Transfer Efficiency
100% efficient
100% efficient
Info::
Transfer efficiency: 100%
Only 0 KB of potential savings identified. Your page is well-optimized for size.
Actual transfer 230 KB
Theoretical minimum 230 KB
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
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.