https://froga.io
Sustainability
· 8 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.SCORE
88
GRADE
B
FIX
0
REVIEW
3
PASS
4
INFO
1
Checks
84 PASS 3 REVIEW
BCarbon Budget37th percentileREVIEW
Carbon Budget
37th percentile
37th percentile
Info::
0.47g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 63% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 37th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website
0.47g
37th percentile
Cleaner than 63% of websites
✓ Below the Web Sustainability Guidelines target
vs Median 21% cleaner ✓
vs Target 5% cleaner ✓
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
ACO2 Per Page Load0.47g CO2 per viewPASS
CO2 Per Page Load
0.47g CO2 per view
0.47g CO2 per view
Info::
0.47g CO2 per page view
This page transfers 2.0 MB, producing an estimated 0.47g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.10g, end-user device 0.36g.
Got: 0.47g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 56.9 kg CO2/year
With 10,000 page views per month, this page would generate approximately 56.9 kg of CO2 annually — equivalent to charging 7111 smartphones.
Info::
Green hosting reduces data center emissions
0.47g
Carbon Footprint per page view
✓ Below sustainability target (0.50g)
Cleaner than 63% of websites
Sustainable Web Design model v4 · Page size: 2.0 MB
Your site
0.47g
Top 10%
0.20g
Target
0.50g
Median website
0.60g
Energy Breakdown
Data center
0.01g
Network
0.10g
End-user device
0.36g
At 10,000 monthly views: Monthly: 4.7 kg · Annual: 56.9 kg · ≈ 7111 smartphone charges
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 Weight99% cachedPASS
Repeat Visit Weight
99% cached
99% cached
Info::
99% reduction on repeat visits
Returning visitors download only 21 KB (vs 2051 KB first visit). 60 of 61 resources are served from browser cache, saving 0.47g CO2 per repeat visit.
Info::
Repeat visit: 0.01g CO2 (first visit: 0.47g)
First visit
2051 KB
Repeat visit
21 KB
99% reduction on repeat visits
Saving 0.47g CO2 per returning visitor
60 resources served from cache · 1 resources re-downloaded
A+Transfer Efficiency95% efficientPASS
Transfer Efficiency
95% efficient
95% efficient
Info::
Transfer efficiency: 95%
Only 109 KB of potential savings identified. Your page is well-optimized for size.
Total waste: 109 KB (5% of page weight)
Unused JS 109 KB
0.03g unnecessary CO2 per visit
Actual transfer 2051 KB
Theoretical minimum 1941 KB
Potential savings 109 KB (0.03g CO2)
See Deep Analysis sections above for specific optimizations.
Image Optimization1 images, 0 KB total, 0 KB wastedINFO
Image Optimization
1 images, 0 KB total, 0 KB wasted
Image Optimization Audit
Total Images
1
Total Size
0 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.