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https://www.coloriet.nl

Sustainability

· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
79
GRADE
C
FIX
1
REVIEW
3
PASS
3
INFO
1
Device:
Mobile Desktop
Checks
8
3 PASS 3 REVIEW 1 FIX
D
Carbon Budget
Action
51th percentile
FIX
51th percentile
Warning::
0.67g CO2 — above the median website (0.60g)
Heavier than an estimated 49% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 51th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.67g

51st percentile

Cleaner than 49% of websites

✗ Above the median website

vs Median 12% more
vs Target 34% more
B
CO2 Per Page Load
0.67g CO2 per view
REVIEW
0.67g CO2 per view
Info::
0.67g CO2 per page view
This page transfers 2.8 MB, producing an estimated 0.67g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.14g, end-user device 0.51g.
Got: 0.67g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 80.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 80.3 kg of CO2 annually — equivalent to charging 10035 smartphones.
Info::
Green hosting reduces data center emissions

0.67g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 49% of websites

Sustainable Web Design model v4 · Page size: 2.8 MB

Your site
0.67g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.02g
Network
0.14g
End-user device
0.51g
At 10,000 monthly views: Monthly: 6.7 kg · Annual: 80.3 kg · ≈ 10035 smartphone charges
C
Web Font Weight Variants
Action
10 font weights loaded across 1 famil(y/ies)
REVIEW
10 font weights loaded across 1 famil(y/ies)
Warning::
10 font weights loaded -- likely 100+ KB of unused payload
Loading 10 font weights typically transfers 200-400 KB just for fonts. Most pages legitimately use 2-3 weights (regular + bold, maybe medium). Audit which weights your stylesheet actually applies and trim the Google Fonts URL accordingly. Affected families: Lato.
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
Green Hosting
Green (cdn)
PASS
Green (cdn)
Info::
Cloudflare CDN uses renewable energy
Since most traffic is served through the CDN, the majority of data transfer energy is renewable.
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 Not identified✗CDN Cloudflare✓

Cloudflare: 100% renewable energy for global network since 2019

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
99% cached
PASS
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 39 KB (vs 2894 KB first visit). 80 of 81 resources are served from browser cache, saving 0.66g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.67g)
First visit
2894 KB
Repeat visit
39 KB

99% reduction on repeat visits

Saving 0.66g CO2 per returning visitor

80 resources served from cache · 1 resources re-downloaded

A+
Transfer Efficiency
92% efficient
PASS
92% efficient
Info::
Transfer efficiency: 92%
Only 230 KB of potential savings identified. Your page is well-optimized for size.
92% efficient

Total waste: 230 KB (8% of page weight)

Unused JS 230 KB

0.05g unnecessary CO2 per visit

Actual transfer 2894 KB
Theoretical minimum 2663 KB
Potential savings 230 KB (0.05g CO2)

See Deep Analysis sections above for specific optimizations.

Image Optimization
69 images, 0 KB total, 0 KB wasted
INFO

Image Optimization Audit

Total Images

69

Total Size

0 KB

69 missing dimensions 1 missing lazy loading
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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