Skip to content
https://vrt.be

Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
68
GRADE
D
FIX
3
REVIEW
1
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 1 REVIEW 3 FIX
D
CO2 Per Page Load
Action
1.32g CO2 per view
FIX
1.32g CO2 per view
Warning::
1.32g CO2 per page view
This page transfers 4.7 MB, producing an estimated 1.32g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.24g, network 0.23g, end-user device 0.85g.
Got: 1.32g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 158.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 158.1 kg of CO2 annually — equivalent to charging 19768 smartphones.

1.32g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 30% of websites

Sustainable Web Design model v4 · Page size: 4.7 MB

Your site
1.32g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.24g
Network
0.23g
End-user device
0.85g
At 10,000 monthly views: Monthly: 13.2 kg · Annual: 158.1 kg · ≈ 19768 smartphone charges
D
Green Hosting
Action
Not green
FIX
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

D
Carbon Budget
Action
70th percentile
FIX
70th percentile
Warning::
1.32g 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

1.32g

70th percentile

Cleaner than 30% of websites

✗ Above the median website

vs Median 120% more
vs Target 164% more
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Repeat Visit Weight
98% cached
PASS
98% cached
Info::
98% reduction on repeat visits
Returning visitors download only 76 KB (vs 4765 KB first visit). 108 of 111 resources are served from browser cache, saving 1.30g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 1.32g)
First visit
4765 KB
Repeat visit
76 KB

98% reduction on repeat visits

Saving 1.30g CO2 per returning visitor

108 resources served from cache · 3 resources re-downloaded

A+
Transfer Efficiency
96% efficient
PASS
96% efficient
Info::
Transfer efficiency: 96%
Only 209 KB of potential savings identified. Your page is well-optimized for size.
96% efficient

Total waste: 209 KB (4% of page weight)

Unused JS 209 KB

0.06g unnecessary CO2 per visit

Actual transfer 4765 KB
Theoretical minimum 4555 KB
Potential savings 209 KB (0.06g CO2)

See Deep Analysis sections above for specific optimizations.

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

Send Feedback