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 2 REVIEW 3 FIX

CO2 Per Page Load

Action

1.14g CO2 per view

FIX

1.14g CO2 per view

1.14g CO2 per page view

This page transfers 4.0 MB, producing an estimated 1.14g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.21g, network 0.20g, end-user device 0.73g.

Got: 1.14g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 136.7 kg CO2/year

With 10,000 page views per month, this page would generate approximately 136.7 kg of CO2 annually — equivalent to charging 17093 smartphones.

1.14g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 35% of websites

Sustainable Web Design model v4 · Page size: 4.0 MB

Your site

1.14g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.21g

Network

0.20g

End-user device

0.73g

At 10,000 monthly views: Monthly: 11.4 kg · Annual: 136.7 kg · ≈ 17093 smartphone charges

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

Carbon Budget

Action

65th percentile

FIX

65th percentile

1.14g CO2 — above the median website (0.60g)

Heavier than an estimated 35% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.

Estimated 65th percentile

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

Top 10%

Target

Median website

1.14g

65th percentile

Cleaner than 35% of websites

✗ Above the median website

vs Median 90% more

vs Target 128% 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 113 KB (vs 4120 KB first visit). 341 of 346 resources are served from browser cache, saving 1.11g CO2 per repeat visit.

Repeat visit: 0.03g CO2 (first visit: 1.14g)

First visit

4120 KB

Repeat visit

113 KB

97% reduction on repeat visits

Saving 1.11g CO2 per returning visitor

341 resources served from cache · 5 resources re-downloaded

A+

Transfer Efficiency

92% efficient

PASS

92% efficient

Transfer efficiency: 92%

Only 335 KB of potential savings identified. Your page is well-optimized for size.

Total waste: 335 KB (8% of page weight)

Unused JS 335 KB

0.09g unnecessary CO2 per visit

Actual transfer 4120 KB

Theoretical minimum 3784 KB

Potential savings 335 KB (0.09g CO2)

See Deep Analysis sections above for specific optimizations.

Image Optimization

54 images, 812 KB total, 553 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

812 KB

Oversized

Wasted

553 KB

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