Sustainability

· 7 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 Express✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

Carbon Budget

35th percentile

REVIEW

35th percentile

0.45g CO2 — below the sustainability target of 0.50g

Cleaner than an estimated 65% of websites analyzed. This page meets the Web Sustainability Guidelines target.

Estimated 35th percentile

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

Top 10%

Target

Median website

0.45g

35th percentile

Cleaner than 65% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 25% cleaner ✓

vs Target 10% cleaner ✓

Transfer Efficiency

Action

64% efficient

REVIEW

64% efficient

Transfer efficiency: 64%

An estimated 588 KB (36%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 588 KB of unused JavaScript. This wasted data produces 0.16g of unnecessary CO2 per page view.

Total waste: 588 KB (36% of page weight)

Unused JS 588 KB

0.16g unnecessary CO2 per visit

Actual transfer 1627 KB

Theoretical minimum 1038 KB

Potential savings 588 KB (0.16g CO2)

See Deep Analysis sections above for specific optimizations.

Web Font Weight Variants

Action

28 font weights loaded across 9 famil(y/ies)

REVIEW

28 font weights loaded across 9 famil(y/ies)

28 font weights loaded -- likely 100+ KB of unused payload

Loading 28 font weights typically transfers 200-400 KB just for fonts. Most pages legitimately use 2-3 weights (regular + bold, maybe medium). Audit which weights your stylesheet actually applies and trim the Google Fonts URL accordingly. Affected families: Amiri, Cinzel, Gulzar, Hind Siliguri, Noto Nastaliq Urdu, Noto Serif Bengali, Noto Serif Devanagari, Playfair Display, Plus Jakarta Sans.

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

CO2 Per Page Load

0.45g CO2 per view

PASS

0.45g CO2 per view

0.45g CO2 per page view

This page transfers 1.6 MB, producing an estimated 0.45g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.08g, network 0.08g, end-user device 0.29g.

Got: 0.45g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 54.0 kg CO2/year

With 10,000 page views per month, this page would generate approximately 54.0 kg of CO2 annually — equivalent to charging 6750 smartphones.

0.45g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 65% of websites

Sustainable Web Design model v4 · Page size: 1.6 MB

Your site

0.45g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.08g

Network

0.08g

End-user device

0.29g

At 10,000 monthly views: Monthly: 4.5 kg · Annual: 54.0 kg · ≈ 6750 smartphone charges

A+

Repeat Visit Weight

100% cached

PASS

100% cached

100% reduction on repeat visits

Returning visitors download only 2 KB (vs 1627 KB first visit). 11 of 12 resources are served from browser cache, saving 0.45g CO2 per repeat visit.

Repeat visit: 0.00g CO2 (first visit: 0.45g)

First visit

1627 KB

Repeat visit

2 KB

100% reduction on repeat visits

Saving 0.45g CO2 per returning visitor

11 resources served from cache · 1 resources re-downloaded

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