https://app.exonore.fr
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
82
GRADE
B
FIX
0
REVIEW
5
PASS
2
INFO
1
Checks
82 PASS 5 REVIEW
BCO2 Per Page Load0.59g CO2 per viewREVIEW
CO2 Per Page Load
0.59g CO2 per view
0.59g CO2 per view
Info::
0.59g CO2 per page view
This page transfers 2.5 MB, producing an estimated 0.59g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.12g, end-user device 0.45g.
Got: 0.59g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 70.4 kg CO2/year
With 10,000 page views per month, this page would generate approximately 70.4 kg of CO2 annually — equivalent to charging 8804 smartphones.
Info::
Green hosting reduces data center emissions
0.59g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 52% of websites
Sustainable Web Design model v4 · Page size: 2.5 MB
Your site
0.59g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.01g
Network
0.12g
End-user device
0.45g
At 10,000 monthly views: Monthly: 5.9 kg · Annual: 70.4 kg · ≈ 8804 smartphone charges
BCarbon Budget48th percentileREVIEW
Carbon Budget
48th percentile
48th percentile
Info::
0.59g CO2 — below the median website (0.60g)
Better than an estimated 52% of websites, but above the sustainability target of 0.50g. Reducing page weight would help reach the target.
Info::
Estimated 48th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.59g
48th percentile
Cleaner than 52% of websites
✗ Above the median website
vs Median 2% cleaner ✓
vs Target 17% more
BTransfer Efficiency86% efficientREVIEW
Transfer Efficiency
86% efficient
86% efficient
Info::
Transfer efficiency: 86%
An estimated 344 KB (14%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 344 KB of unused JavaScript. This wasted data produces 0.08g of unnecessary CO2 per page view.
Total waste: 344 KB (14% of page weight)
Unused JS 344 KB
0.08g unnecessary CO2 per visit
Actual transfer 2539 KB
Theoretical minimum 2195 KB
Potential savings 344 KB (0.08g CO2)
See Deep Analysis sections above for specific optimizations.
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.
CGreen HostingActionWhether the site is served from green-energy infrastructureREVIEW
Green Hosting
ActionWhether the site is served from green-energy infrastructure
Green Hosting
No green hosting detected
AGreen HostingGreen (cdn)PASS
Green Hosting
Green (cdn)
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 Weight91% cachedPASS
Repeat Visit Weight
91% cached
91% cached
Info::
91% reduction on repeat visits
Returning visitors download only 241 KB (vs 2539 KB first visit). 34 of 37 resources are served from browser cache, saving 0.53g CO2 per repeat visit.
Info::
Repeat visit: 0.06g CO2 (first visit: 0.59g)
First visit
2539 KB
Repeat visit
241 KB
91% reduction on repeat visits
Saving 0.53g CO2 per returning visitor
34 resources served from cache · 3 resources re-downloaded
Image Optimization1 images, 308 KB total, 0 KB wastedINFO
Image Optimization
1 images, 308 KB total, 0 KB wasted
Image Optimization Audit
Total Images
1
Total Size
308 KB
1 missing dimensions 1 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.