Skip to content
https://seowebchecker.com/ai-website-tester

Sustainability

· 7 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
77
GRADE
C
FIX
0
REVIEW
5
PASS
2
INFO
0
Device:
Mobile Desktop
Checks
7
2 PASS 5 REVIEW
B
CO2 Per Page Load
0.56g CO2 per view
REVIEW
0.56g CO2 per view
Info::
0.56g CO2 per page view
This page transfers 2.3 MB, producing an estimated 0.56g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.11g, end-user device 0.43g.
Got: 0.56g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 66.7 kg CO2/year
With 10,000 page views per month, this page would generate approximately 66.7 kg of CO2 annually — equivalent to charging 8338 smartphones.
Info::
Green hosting reduces data center emissions

0.56g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 55% of websites

Sustainable Web Design model v4 · Page size: 2.3 MB

Your site
0.56g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.01g
Network
0.11g
End-user device
0.43g
At 10,000 monthly views: Monthly: 5.6 kg · Annual: 66.7 kg · ≈ 8338 smartphone charges
B
Carbon Budget
45th percentile
REVIEW
45th percentile
Info::
0.56g CO2 — below the median website (0.60g)
Better than an estimated 55% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.
Info::
Estimated 45th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.56g

45th percentile

Cleaner than 55% of websites

✗ Above the median website

vs Median 7% cleaner ✓
vs Target 11% more
B
Transfer Efficiency
82% efficient
REVIEW
82% efficient
Info::
Transfer efficiency: 82%
An estimated 434 KB (18%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 434 KB of unused JavaScript. This wasted data produces 0.10g of unnecessary CO2 per page view.
82% efficient

Total waste: 434 KB (18% of page weight)

Unused JS 434 KB

0.10g unnecessary CO2 per visit

Actual transfer 2405 KB
Theoretical minimum 1970 KB
Potential savings 434 KB (0.10g CO2)

See Deep Analysis sections above for specific optimizations.

C
Web Font Weight Variants
Action
32 font weights loaded across 6 famil(y/ies)
REVIEW
32 font weights loaded across 6 famil(y/ies)
Warning::
32 font weights loaded -- likely 100+ KB of unused payload
Loading 32 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: Archivo, Google%20Sans%20Text%3A400%2C500, Google%20Sans%20Text%3A400%2C500%2C700, Google%20Symbols%3Aopsz%2Cwght%2CFILL%2CGRAD%4020..48%2C100..700%2C0..1%2C-50..200, Inter, Outfit.
C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A
Green Hosting
Green (cdn)
PASS
Green (cdn)
Info::
Cloudflare CDN uses renewable energy
Since most traffic is served through the CDN, the majority of data transfer energy is renewable.
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 Not identified✗CDN Cloudflare✓

Cloudflare: 100% renewable energy for global network since 2019

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
96% cached
PASS
96% cached
Info::
96% reduction on repeat visits
Returning visitors download only 88 KB (vs 2405 KB first visit). 71 of 77 resources are served from browser cache, saving 0.54g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.56g)
First visit
2405 KB
Repeat visit
88 KB

96% reduction on repeat visits

Saving 0.54g CO2 per returning visitor

71 resources served from cache · 6 resources re-downloaded

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

Send Feedback