https://simpleswap.io/?id=jvw7l9dn7nk6aj4j

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 3 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 Next.js✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

Repeat Visit Weight

76% cached

REVIEW

76% cached

76% reduction on repeat visits

Returning visitors download only 262 KB (vs 1076 KB first visit). 69 of 70 resources are served from browser cache, saving 0.23g CO2 per repeat visit.

Repeat visit: 0.07g CO2 (first visit: 0.30g)

First visit

1076 KB

Repeat visit

262 KB

76% reduction on repeat visits

Saving 0.23g CO2 per returning visitor

69 resources served from cache · 1 resources re-downloaded

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

CO2 Per Page Load

0.30g CO2 per view

PASS

0.30g CO2 per view

0.30g CO2 per page view

This page transfers 1.1 MB, producing an estimated 0.30g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.06g, network 0.05g, end-user device 0.19g.

Got: 0.30g CO2 Expected: < 0.50g (sustainability target)

At 10,000 monthly views: 35.7 kg CO2/year

With 10,000 page views per month, this page would generate approximately 35.7 kg of CO2 annually — equivalent to charging 4466 smartphones.

0.30g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 81% of websites

Sustainable Web Design model v4 · Page size: 1.1 MB

Your site

0.30g

Top 10%

0.20g

Target

0.50g

Median website

0.60g

Energy Breakdown

Data center

0.06g

Network

0.05g

End-user device

0.19g

At 10,000 monthly views: Monthly: 3.0 kg · Annual: 35.7 kg · ≈ 4466 smartphone charges

Carbon Budget

19th percentile

PASS

19th percentile

0.30g CO2 — below the sustainability target of 0.50g

Cleaner than an estimated 81% of websites analyzed. This page meets the Web Sustainability Guidelines target.

Estimated 19th percentile

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

Top 10%

Target

Median website

0.30g

19th percentile

Cleaner than 81% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 50% cleaner ✓

vs Target 40% cleaner ✓

A+

Transfer Efficiency

98% efficient

PASS

98% efficient

Transfer efficiency: 98%

Only 20 KB of potential savings identified. Your page is well-optimized for size.

Total waste: 20 KB (2% of page weight)

Unused JS 20 KB

0.01g unnecessary CO2 per visit

Actual transfer 1076 KB

Theoretical minimum 1056 KB

Potential savings 20 KB (0.01g CO2)

See Deep Analysis sections above for specific optimizations.

Image Optimization

76 images, 0 KB total, 0 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

0 KB

6 missing alt text 11 missing dimensions 56 missing lazy loading

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