https://otpp.com
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
78
GRADE
C
FIX
1
REVIEW
3
PASS
3
INFO
1
Checks
83 PASS 3 REVIEW 1 FIX
DCarbon BudgetAction52th percentileFIX
Carbon Budget
Action52th percentile
52th percentile
Warning::
0.69g CO2 — above the median website (0.60g)
Heavier than an estimated 48% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 52th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.69g
52nd percentile
Cleaner than 48% of websites
✗ Above the median website
vs Median 16% more
vs Target 39% more
BCO2 Per Page Load0.69g CO2 per viewREVIEW
CO2 Per Page Load
0.69g CO2 per view
0.69g CO2 per view
Info::
0.69g CO2 per page view
This page transfers 2.9 MB, producing an estimated 0.69g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.02g, network 0.14g, end-user device 0.53g.
Got: 0.69g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 83.3 kg CO2/year
With 10,000 page views per month, this page would generate approximately 83.3 kg of CO2 annually — equivalent to charging 10413 smartphones.
Info::
Green hosting reduces data center emissions
0.69g
Carbon Footprint per page view
✗ Above sustainability target (0.50g)
Cleaner than 48% of websites
Sustainable Web Design model v4 · Page size: 2.9 MB
Your site
0.69g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.02g
Network
0.14g
End-user device
0.53g
At 10,000 monthly views: Monthly: 6.9 kg · Annual: 83.3 kg · ≈ 10413 smartphone charges
CTransfer EfficiencyAction68% efficientREVIEW
Transfer Efficiency
Action68% efficient
68% efficient
Warning::
Transfer efficiency: 68%
An estimated 949 KB (32%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 949 KB of unused JavaScript. This wasted data produces 0.22g of unnecessary CO2 per page view.
Total waste: 949 KB (32% of page weight)
Unused JS 949 KB
0.22g unnecessary CO2 per visit
Actual transfer 3003 KB
Theoretical minimum 2054 KB
Potential savings 949 KB (0.22g 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.
A+Green HostingGreen (both)PASS
Green Hosting
Green (both)
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Equinix, Inc., CDN: Fastly
Info::
Equinix, Inc.: Verified by the Green Web Foundation
Info::
Fastly: 100% renewable energy for edge network
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 Equinix, Inc.✓CDN Fastly✓
Equinix, Inc.: 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 Weight97% cachedPASS
Repeat Visit Weight
97% cached
97% cached
Info::
97% reduction on repeat visits
Returning visitors download only 95 KB (vs 3003 KB first visit). 68 of 70 resources are served from browser cache, saving 0.67g CO2 per repeat visit.
Info::
Repeat visit: 0.02g CO2 (first visit: 0.69g)
First visit
3003 KB
Repeat visit
95 KB
97% reduction on repeat visits
Saving 0.67g CO2 per returning visitor
68 resources served from cache · 2 resources re-downloaded
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: Equinix, Inc.
Image Optimization8 images, 0 KB total, 0 KB wastedINFO
Image Optimization
8 images, 0 KB total, 0 KB wasted
Image Optimization Audit
Total Images
8
Total Size
0 KB
Oversized
1
2 missing alt text 7 missing lazy loading
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.