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 2 REVIEW 2 FIX

CO2 Per Page Load

Action

0.98g CO2 per view

FIX

0.98g CO2 per view

0.98g CO2 per page view

This page transfers 4.2 MB, producing an estimated 0.98g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.20g, end-user device 0.76g.

Got: 0.98g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 118.0 kg CO2/year

With 10,000 page views per month, this page would generate approximately 118.0 kg of CO2 annually — equivalent to charging 14751 smartphones.

Green hosting reduces data center emissions

0.98g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 40% of websites

Sustainable Web Design model v4 · Page size: 4.2 MB

Your site

0.98g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.02g

Network

0.20g

End-user device

0.76g

At 10,000 monthly views: Monthly: 9.8 kg · Annual: 118.0 kg · ≈ 14751 smartphone charges

Carbon Budget

Action

60th percentile

FIX

60th percentile

0.98g CO2 — above the median website (0.60g)

Heavier than an estimated 40% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.

Estimated 60th percentile

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

Top 10%

Target

Median website

0.98g

60th percentile

Cleaner than 40% of websites

✗ Above the median website

vs Median 64% more

vs Target 97% more

Green Hosting

Green (hosting)

REVIEW

Green (hosting)

Hetzner Online GmbH uses renewable energy

Hetzner Online GmbH: 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 Hetzner Online GmbH✓CDN Not identified✗

Hetzner Online GmbH: Verified by the Green Web Foundation

Based on known provider commitments. Verify at thegreenwebfoundation.org

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

100% cached

PASS

100% cached

100% reduction on repeat visits

Returning visitors download only 8 KB (vs 4254 KB first visit). 19 of 20 resources are served from browser cache, saving 0.98g CO2 per repeat visit.

Repeat visit: 0.00g CO2 (first visit: 0.98g)

First visit

4254 KB

Repeat visit

8 KB

100% reduction on repeat visits

Saving 0.98g CO2 per returning visitor

19 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 4254 KB

Theoretical minimum 4254 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: Hetzner Online GmbH

Image Optimization

15 images, 3728 KB total, 825 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

3728 KB

Oversized

Wasted

825 KB

15 missing dimensions

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