https://swappz.com
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
81
GRADE
B
FIX
2
REVIEW
1
PASS
4
INFO
1
Checks
84 PASS 1 REVIEW 2 FIX
FCO2 Per Page LoadAction1.60g CO2 per viewFIX
CO2 Per Page Load
Action1.60g CO2 per view
1.60g CO2 per view
Warning::
1.60g CO2 per page view
This page transfers 6.7 MB, producing an estimated 1.60g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.04g, network 0.33g, end-user device 1.23g.
Got: 1.60g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 191.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 191.6 kg of CO2 annually — equivalent to charging 23947 smartphones.
Info::
Green hosting reduces data center emissions
1.60g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 22% of websites
Sustainable Web Design model v4 · Page size: 6.7 MB
Your site
1.60g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.04g
Network
0.33g
End-user device
1.23g
At 10,000 monthly views: Monthly: 16.0 kg · Annual: 191.6 kg · ≈ 23947 smartphone charges
FCarbon BudgetAction78th percentileFIX
Carbon Budget
Action78th percentile
78th percentile
Warning::
1.60g CO2 — above the median website (0.60g)
Heavier than an estimated 22% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 78th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
1.60g
78th percentile
Cleaner than 22% of websites
✗ Above the median website
vs Median 166% more
vs Target 219% more
BWeb Font Weight VariantsNo detectable Google Fonts weightsREVIEW
Web Font Weight Variants
No detectable Google Fonts weights
No detectable Google Fonts weights
Info::
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+Green HostingGreen (both)PASS
Green Hosting
Green (both)
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Cloudflare, CDN: Cloudflare
Info::
Cloudflare: Verified by the Green Web Foundation
Info::
Cloudflare: 100% renewable energy for global network since 2019
Info::
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 Cloudflare✓CDN Cloudflare✓
Cloudflare: Verified by the Green Web Foundation
Cloudflare: 100% renewable energy for global network since 2019
Based on known provider commitments. Verify at thegreenwebfoundation.org
A+Repeat Visit Weight97% cachedPASS
Repeat Visit Weight
97% cached
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 240 KB (vs 6907 KB first visit). 53 of 54 resources are served from browser cache, saving 1.54g CO2 per repeat visit.
Info::
Repeat visit: 0.06g CO2 (first visit: 1.60g)
First visit
6907 KB
Repeat visit
240 KB
97% reduction on repeat visits
Saving 1.54g CO2 per returning visitor
53 resources served from cache · 1 resources re-downloaded
A+Transfer Efficiency95% efficientPASS
Transfer Efficiency
95% efficient
95% efficient
Info::
Transfer efficiency: 95%
Only 340 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 340 KB (5% of page weight)
Unused JS 340 KB
0.08g unnecessary CO2 per visit
Actual transfer 6907 KB
Theoretical minimum 6566 KB
Potential savings 340 KB (0.08g CO2)
See Deep Analysis sections above for specific optimizations.
A+Green HostingWhether the site is served from green-energy infrastructurePASS
Green Hosting
Whether the site is served from green-energy infrastructure
Green Hosting
This site is hosted on green energy infrastructure
Provider: Cloudflare
Image Optimization52 images, 0 KB total, 0 KB wastedINFO
Image Optimization
52 images, 0 KB total, 0 KB wasted
Image Optimization Audit
Total Images
52
Total Size
0 KB
27 missing alt text 49 missing dimensions 30 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.