Sustainability

· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Device:

Mobile Desktop

Checks

2 PASS 4 REVIEW 1 FIX

Green Hosting

Action

Not green

FIX

Not green

No confirmed renewable energy commitment detected

Consider providers like Cloudflare, Google Cloud, or Vercel that match 100% of their energy use with renewables.

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 Not identified✗CDN Shopify✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

CO2 Per Page Load

0.50g CO2 per view

REVIEW

0.50g CO2 per view

0.50g CO2 per page view

This page transfers 1.8 MB, producing an estimated 0.50g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.09g, network 0.09g, end-user device 0.32g.

Got: 0.50g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 60.3 kg CO2/year

With 10,000 page views per month, this page would generate approximately 60.3 kg of CO2 annually — equivalent to charging 7541 smartphones.

0.50g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 60% of websites

Sustainable Web Design model v4 · Page size: 1.8 MB

Your site

0.50g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.09g

Network

0.09g

End-user device

0.32g

At 10,000 monthly views: Monthly: 5.0 kg · Annual: 60.3 kg · ≈ 7541 smartphone charges

Carbon Budget

40th percentile

REVIEW

40th percentile

0.50g CO2 — below the median website (0.60g)

Better than an estimated 60% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.

Estimated 40th percentile

Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.

Top 10%

Target

Median website

0.50g

40th percentile

Cleaner than 60% of websites

✗ Above the median website

vs Median 16% cleaner ✓

vs Target 1% more

Web Font Weight Variants

No detectable Google Fonts weights

REVIEW

No detectable Google Fonts weights

The analyzer detects font weights via Google Fonts URL parameters (~70% of font-using sites). Self-hosted fonts and non-Google CDN fonts aren't visible to URL-based detection. If you self-host fonts, manually audit how many @font-face weights you ship -- 2-3 weights per family is typically enough; 5+ is usually unused payload.

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

A+

Repeat Visit Weight

97% cached

PASS

97% cached

97% reduction on repeat visits

Returning visitors download only 46 KB (vs 1817 KB first visit). 257 of 260 resources are served from browser cache, saving 0.49g CO2 per repeat visit.

Repeat visit: 0.01g CO2 (first visit: 0.50g)

First visit

1817 KB

Repeat visit

46 KB

97% reduction on repeat visits

Saving 0.49g CO2 per returning visitor

257 resources served from cache · 3 resources re-downloaded

A+

Transfer Efficiency

98% efficient

PASS

98% efficient

Transfer efficiency: 98%

Only 41 KB of potential savings identified. Your page is well-optimized for size.

Total waste: 41 KB (2% of page weight)

Unused JS 41 KB

0.01g unnecessary CO2 per visit

Actual transfer 1817 KB

Theoretical minimum 1776 KB

Potential savings 41 KB (0.01g CO2)

See Deep Analysis sections above for specific optimizations.

Image Optimization

8 images, 154 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

154 KB

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