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 Apache HTTP Server✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

CO2 Per Page Load

0.59g CO2 per view

REVIEW

0.59g CO2 per view

0.59g CO2 per page view

This page transfers 2.1 MB, producing an estimated 0.59g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.11g, network 0.10g, end-user device 0.38g.

Got: 0.59g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 70.8 kg CO2/year

With 10,000 page views per month, this page would generate approximately 70.8 kg of CO2 annually — equivalent to charging 8847 smartphones.

0.59g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 52% of websites

Sustainable Web Design model v4 · Page size: 2.1 MB

Your site

0.59g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.11g

Network

0.10g

End-user device

0.38g

At 10,000 monthly views: Monthly: 5.9 kg · Annual: 70.8 kg · ≈ 8847 smartphone charges

Carbon Budget

48th percentile

REVIEW

48th percentile

0.59g CO2 — below the median website (0.60g)

Better than an estimated 52% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.

Estimated 48th percentile

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

Top 10%

Target

Median website

0.59g

48th percentile

Cleaner than 52% of websites

✗ Above the median website

vs Median 2% cleaner ✓

vs Target 18% 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

98% cached

PASS

98% cached

98% reduction on repeat visits

Returning visitors download only 46 KB (vs 2132 KB first visit). 111 of 112 resources are served from browser cache, saving 0.58g CO2 per repeat visit.

Repeat visit: 0.01g CO2 (first visit: 0.59g)

First visit

2132 KB

Repeat visit

46 KB

98% reduction on repeat visits

Saving 0.58g CO2 per returning visitor

111 resources served from cache · 1 resources re-downloaded

A+

Transfer Efficiency

95% efficient

PASS

95% efficient

Transfer efficiency: 95%

Only 107 KB of potential savings identified. Your page is well-optimized for size.

Total waste: 107 KB (5% of page weight)

Unused JS 107 KB

0.03g unnecessary CO2 per visit

Actual transfer 2132 KB

Theoretical minimum 2025 KB

Potential savings 107 KB (0.03g CO2)

See Deep Analysis sections above for specific optimizations.

Image Optimization

80 images, 320 KB total, 144 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

320 KB

Oversized

Wasted

144 KB

77 missing dimensions 76 missing lazy loading

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