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

0.57g CO2 per view

REVIEW

0.57g CO2 per view

0.57g CO2 per page view

This page transfers 2.0 MB, producing an estimated 0.57g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.11g, network 0.10g, end-user device 0.37g.

Got: 0.57g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 68.3 kg CO2/year

With 10,000 page views per month, this page would generate approximately 68.3 kg of CO2 annually — equivalent to charging 8540 smartphones.

0.57g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 54% of websites

Sustainable Web Design model v4 · Page size: 2.0 MB

Your site

0.57g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.11g

Network

0.10g

End-user device

0.37g

At 10,000 monthly views: Monthly: 5.7 kg · Annual: 68.3 kg · ≈ 8540 smartphone charges

Carbon Budget

46th percentile

REVIEW

46th percentile

0.57g CO2 — below the median website (0.60g)

Better than an estimated 54% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.

Estimated 46th percentile

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

Top 10%

Target

Median website

0.57g

46th percentile

Cleaner than 54% of websites

✗ Above the median website

vs Median 5% cleaner ✓

vs Target 14% 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

99% cached

PASS

99% cached

99% reduction on repeat visits

Returning visitors download only 14 KB (vs 2058 KB first visit). 28 of 32 resources are served from browser cache, saving 0.57g CO2 per repeat visit.

Repeat visit: 0.00g CO2 (first visit: 0.57g)

First visit

2058 KB

Repeat visit

14 KB

99% reduction on repeat visits

Saving 0.57g CO2 per returning visitor

28 resources served from cache · 4 resources re-downloaded

A+

Transfer Efficiency

99% efficient

PASS

99% efficient

Transfer efficiency: 99%

Only 22 KB of potential savings identified. Your page is well-optimized for size.

Total waste: 22 KB (1% of page weight)

Unused JS 22 KB

0.01g unnecessary CO2 per visit

Actual transfer 2058 KB

Theoretical minimum 2036 KB

Potential savings 22 KB (0.01g CO2)

See Deep Analysis sections above for specific optimizations.

Image Optimization

2 images, 259 KB total, 192 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

259 KB

Oversized

Wasted

192 KB

1 missing dimensions 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.