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

3 PASS 4 REVIEW

CO2 Per Page Load

0.55g CO2 per view

REVIEW

0.55g CO2 per view

0.55g CO2 per page view

This page transfers 2.3 MB, producing an estimated 0.55g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.11g, end-user device 0.43g.

Got: 0.55g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 66.4 kg CO2/year

With 10,000 page views per month, this page would generate approximately 66.4 kg of CO2 annually — equivalent to charging 8305 smartphones.

Green hosting reduces data center emissions

0.55g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 55% of websites

Sustainable Web Design model v4 · Page size: 2.3 MB

Your site

0.55g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.01g

Network

0.11g

End-user device

0.43g

At 10,000 monthly views: Monthly: 5.5 kg · Annual: 66.4 kg · ≈ 8305 smartphone charges

Green Hosting

Green (hosting)

REVIEW

Green (hosting)

Amazon Web Services uses renewable energy

Amazon Web Services: Verified by the Green Web Foundation

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 Amazon Web Services✓CDN Shopify✗

Amazon Web Services: Verified by the Green Web Foundation

Based on known provider commitments. Verify at thegreenwebfoundation.org

Carbon Budget

45th percentile

REVIEW

45th percentile

0.55g CO2 — below the median website (0.60g)

Better than an estimated 55% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.

Estimated 45th percentile

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

Top 10%

Target

Median website

0.55g

45th percentile

Cleaner than 55% of websites

✗ Above the median website

vs Median 8% cleaner ✓

vs Target 11% 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.

A+

Repeat Visit Weight

96% cached

PASS

96% cached

96% reduction on repeat visits

Returning visitors download only 103 KB (vs 2395 KB first visit). 153 of 154 resources are served from browser cache, saving 0.53g CO2 per repeat visit.

Repeat visit: 0.02g CO2 (first visit: 0.55g)

First visit

2395 KB

Repeat visit

103 KB

96% reduction on repeat visits

Saving 0.53g CO2 per returning visitor

153 resources served from cache · 1 resources re-downloaded

A+

Transfer Efficiency

100% efficient

PASS

100% efficient

Transfer efficiency: 100%

Only 0 KB of potential savings identified. Your page is well-optimized for size.

Actual transfer 2395 KB

Theoretical minimum 2395 KB

See Deep Analysis sections above for specific optimizations.

A+

Green Hosting

Whether the site is served from green-energy infrastructure

PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

Image Optimization

200 images, 336 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

200

Total Size

336 KB

2 missing alt text 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.