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https://komoot.com

Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
57
GRADE
D
FIX
3
REVIEW
1
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
6
2 PASS 1 REVIEW 3 FIX
F
CO2 Per Page Load
Action
2.61g CO2 per view
FIX
2.61g CO2 per view
Critical::
2.61g CO2 per page view
This page transfers 9.2 MB, producing an estimated 2.61g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.48g, network 0.45g, end-user device 1.68g.
Got: 2.61g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 313.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 313.8 kg of CO2 annually — equivalent to charging 39223 smartphones.

2.61g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 5% of websites

Sustainable Web Design model v4 · Page size: 9.2 MB

Your site
2.61g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.48g
Network
0.45g
End-user device
1.68g
At 10,000 monthly views: Monthly: 26.1 kg · Annual: 313.8 kg · ≈ 39223 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::
AWS: Renewable energy varies by region; committed to 100% by 2025
Info::
AWS CloudFront: Renewable varies by edge location
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 AWS✗CDN AWS CloudFront✗

AWS: Renewable energy varies by region; committed to 100% by 2025

AWS CloudFront: Renewable varies by edge location

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
95th percentile
FIX
95th percentile
Warning::
2.61g CO2 — above the median website (0.60g)
Heavier than an estimated 5% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 95th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

2.61g

95th percentile

Cleaner than 5% of websites

✗ Above the median website

vs Median 336% more
vs Target 423% 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
95% cached
PASS
95% cached
Info::
95% reduction on repeat visits
Returning visitors download only 432 KB (vs 9455 KB first visit). 53 of 54 resources are served from browser cache, saving 2.50g CO2 per repeat visit.
Info::
Repeat visit: 0.12g CO2 (first visit: 2.61g)
First visit
9455 KB
Repeat visit
432 KB

95% reduction on repeat visits

Saving 2.50g CO2 per returning visitor

53 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
96% efficient
PASS
96% efficient
Info::
Transfer efficiency: 96%
Only 369 KB of potential savings identified. Your page is well-optimized for size.
96% efficient

Total waste: 369 KB (4% of page weight)

Unused JS 369 KB

0.10g unnecessary CO2 per visit

Actual transfer 9455 KB
Theoretical minimum 9085 KB
Potential savings 369 KB (0.10g 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.

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