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 3 REVIEW 2 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 Next.js✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

Carbon Budget

Action

51th percentile

FIX

51th percentile

0.66g CO2 — above the median website (0.60g)

Heavier than an estimated 49% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.

Estimated 51th percentile

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

Top 10%

Target

Median website

0.66g

51st percentile

Cleaner than 49% of websites

✗ Above the median website

vs Median 9% more

vs Target 31% more

CO2 Per Page Load

0.66g CO2 per view

REVIEW

0.66g CO2 per view

0.66g CO2 per page view

This page transfers 2.3 MB, producing an estimated 0.66g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.12g, network 0.11g, end-user device 0.42g.

Got: 0.66g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 78.6 kg CO2/year

With 10,000 page views per month, this page would generate approximately 78.6 kg of CO2 annually — equivalent to charging 9825 smartphones.

0.66g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 49% of websites

Sustainable Web Design model v4 · Page size: 2.3 MB

Your site

0.66g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.12g

Network

0.11g

End-user device

0.42g

At 10,000 monthly views: Monthly: 6.6 kg · Annual: 78.6 kg · ≈ 9825 smartphone charges

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 39 KB (vs 2368 KB first visit). 103 of 104 resources are served from browser cache, saving 0.64g CO2 per repeat visit.

Repeat visit: 0.01g CO2 (first visit: 0.66g)

First visit

2368 KB

Repeat visit

39 KB

98% reduction on repeat visits

Saving 0.64g CO2 per returning visitor

103 resources served from cache · 1 resources re-downloaded

A+

Transfer Efficiency

93% efficient

PASS

93% efficient

Transfer efficiency: 93%

Only 160 KB of potential savings identified. Your page is well-optimized for size.

Total waste: 160 KB (7% of page weight)

Unused JS 160 KB

0.04g unnecessary CO2 per visit

Actual transfer 2368 KB

Theoretical minimum 2207 KB

Potential savings 160 KB (0.04g CO2)

See Deep Analysis sections above for specific optimizations.

Image Optimization

6 images, 0 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

0 KB

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