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Sustainability

· 7 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
95
GRADE
A
FIX
0
REVIEW
2
PASS
5
INFO
0
Device:
Mobile Desktop
Checks
7
5 PASS 2 REVIEW
B
Web Font Weight Variants
6 font weights loaded across 2 famil(y/ies)
REVIEW
6 font weights loaded across 2 famil(y/ies)
Info::
6 font weights loaded -- review whether all are used
5+ weights for a single page is often more than needed. Compare against the actual font-weight CSS rules in your stylesheets; trim weights that aren't applied to any element. Affected families: Inter, Space Grotesk.
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
CO2 Per Page Load
0.07g CO2 per view
PASS
0.07g CO2 per view
Info::
0.07g CO2 per page view
This page transfers 0.3 MB, producing an estimated 0.07g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.00g, network 0.01g, end-user device 0.05g.
Got: 0.07g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 8.1 kg CO2/year
With 10,000 page views per month, this page would generate approximately 8.1 kg of CO2 annually — equivalent to charging 1014 smartphones.
Info::
Green hosting reduces data center emissions

0.07g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 90% of websites

Sustainable Web Design model v4 · Page size: 0.3 MB

Your site
0.07g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.00g
Network
0.01g
End-user device
0.05g
At 10,000 monthly views: Monthly: 0.7 kg · Annual: 8.1 kg · ≈ 1014 smartphone charges
A
Green Hosting
Green (cdn)
PASS
Green (cdn)
Info::
Netlify CDN uses renewable energy
Since most traffic is served through the CDN, the majority of data transfer energy is renewable.
Info::
Netlify: Hosted on AWS/Google Cloud with renewable energy matching
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 Netlify✓

Netlify: Hosted on AWS/Google Cloud with renewable energy matching

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
86% cached
PASS
86% cached
Info::
86% reduction on repeat visits
Returning visitors download only 41 KB (vs 292 KB first visit). 18 of 19 resources are served from browser cache, saving 0.06g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.07g)
First visit
292 KB
Repeat visit
41 KB

86% reduction on repeat visits

Saving 0.06g CO2 per returning visitor

18 resources served from cache · 1 resources re-downloaded

A+
Carbon Budget
10th percentile
PASS
10th percentile
Info::
0.07g 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

0.07g

10th percentile

Cleaner than 90% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 89% cleaner ✓
vs Target 86% cleaner ✓
A+
Transfer Efficiency
91% efficient
PASS
91% efficient
Info::
Transfer efficiency: 91%
Only 27 KB of potential savings identified. Your page is well-optimized for size.
91% efficient

Total waste: 27 KB (9% of page weight)

Unused JS 27 KB

0.01g unnecessary CO2 per visit

Actual transfer 292 KB
Theoretical minimum 265 KB
Potential savings 27 KB (0.01g 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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