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

5 PASS 2 REVIEW

Transfer Efficiency

87% efficient

REVIEW

87% efficient

Transfer efficiency: 87%

An estimated 151 KB (13%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 151 KB of unused JavaScript. This wasted data produces 0.04g of unnecessary CO2 per page view.

Total waste: 151 KB (13% of page weight)

Unused JS 151 KB

0.04g unnecessary CO2 per visit

Actual transfer 1133 KB

Theoretical minimum 981 KB

Potential savings 151 KB (0.04g CO2)

See Deep Analysis sections above for specific optimizations.

Web Font Weight Variants

Action

10 font weights loaded across 3 famil(y/ies)

REVIEW

10 font weights loaded across 3 famil(y/ies)

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

Loading 10 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: DM Sans, Noto Serif Devanagari, Playfair Display.

CO2 Per Page Load

0.26g CO2 per view

PASS

0.26g CO2 per view

0.26g CO2 per page view

This page transfers 1.1 MB, producing an estimated 0.26g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.05g, end-user device 0.20g.

Got: 0.26g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 31.4 kg CO2/year

With 10,000 page views per month, this page would generate approximately 31.4 kg of CO2 annually — equivalent to charging 3930 smartphones.

Green hosting reduces data center emissions

0.26g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 84% of websites

Sustainable Web Design model v4 · Page size: 1.1 MB

Your site

0.26g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.01g

Network

0.05g

End-user device

0.20g

At 10,000 monthly views: Monthly: 2.6 kg · Annual: 31.4 kg · ≈ 3930 smartphone charges

A+

Green Hosting

Green (both)

PASS

Green (both)

Both hosting and CDN use renewable energy

Got: Hosting: Quis Lab (Plushie App), CDN: Fastly

Quis Lab (Plushie App): Verified by the Green Web Foundation

Fastly: 100% renewable energy for edge network

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 Quis Lab (Plushie App)✓CDN Fastly✓

Quis Lab (Plushie App): Verified by the Green Web Foundation

Fastly: 100% renewable energy for edge network

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+

Repeat Visit Weight

100% cached

PASS

100% cached

100% reduction on repeat visits

Returning visitors download only 2 KB (vs 1133 KB first visit). 64 of 65 resources are served from browser cache, saving 0.26g CO2 per repeat visit.

Repeat visit: 0.00g CO2 (first visit: 0.26g)

First visit

1133 KB

Repeat visit

2 KB

100% reduction on repeat visits

Saving 0.26g CO2 per returning visitor

64 resources served from cache · 1 resources re-downloaded

Carbon Budget

16th percentile

PASS

16th percentile

0.26g CO2 — below the sustainability target of 0.50g

Cleaner than an estimated 84% of websites analyzed. This page meets the Web Sustainability Guidelines target.

Estimated 16th percentile

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

Top 10%

Target

Median website

0.26g

16th percentile

Cleaner than 84% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 56% cleaner ✓

vs Target 48% cleaner ✓

A+

Green Hosting

Whether the site is served from green-energy infrastructure

PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Quis Lab (Plushie App)

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