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Scope 3 emissions — the indirect emissions across your supply chain — are the most difficult to measure and the most critical for sustainability reporting. For many companies, these emissions make up more than 70% of their total footprint, yet data gaps, supplier variability, and inconsistent formats make accurate modeling nearly impossible without the right tools. The good news: modern Life Cycle Assessment (LCA) platforms now combine automation, collaboration, and transparent data workflows to help businesses take control of their value chain impacts. Here’s our expert overview of the best LCA tools for Scope 3 and supply chain modeling in 2025.

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🧭 What Makes a Good Scope 3 LCA Tool?

The best supply chain emissions software doesn’t just quantify carbon — it makes collaboration and transparency possible across multiple stakeholders. Look for these key capabilities: ✅ Supplier engagement workflows and data requests
✅ Automated estimation for missing primary data
✅ Dynamic transport and logistics modeling
✅ Multi-level visibility across product, site, and portfolio levels
✅ CSRD, EF 3.1, and Scope 3 category reporting readiness
✅ AI to handle inconsistencies, conversions, and taxonomy mapping

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Top Tools for Scope 3 Modeling

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1. Sustainly

🌍 Best for scalable supply chain collaboration
  • 🧠 Transparent AI-driven data processing and supplier invite system
  • 📦 Product- and category-level modeling for distributed value chains
  • 📄 Ready-made EF 3.1 and CSRD export templates
  • 🔗 Centralized sustainability data accessible across departments
Overview: Sustainly simplifies Scope 3 management by combining AI automation with structured supplier collaboration.
Its transparent AI copilot helps fill data gaps responsibly, while the platform centralizes all sustainability data in one place—making it easy for sustainability, procurement, and reporting teams to work from the same system. Ideal for: Businesses needing a carbon footprint tool for manufacturing products that scales from product-level LCAs to entire supply chain impact reporting.

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2. Ecochain Helix

🏭 Strong for multi-site manufacturers
  • 📊 Factory-wide and cross-portfolio modeling
  • 👥 Great for managing environmental data across facilities
  • 🔄 Real-time dashboards and updates for Scope 1–3
Overview: Ecochain Helix focuses on operational data and multi-site comparisons. It’s particularly effective for manufacturers that already collect process-level data and want to extend visibility across their full value chain.

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3. SimaPro Flow + Collect

⚙️ For expert users needing full control
  • 🧾 Deep database connectivity
  • 🛠️ Allows custom modeling for any Scope 3 category
  • 👤 Suited for LCA professionals and consultants
Overview: SimaPro’s Flow and Collect modules combine primary data gathering with detailed modeling capabilities. While powerful, it’s less suited for teams needing automation or large-scale supplier collaboration.

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4. One Click LCA

🏗️ Best for construction-related supply chains
  • ✅ EN 15804 and EPD-ready
  • 📤 Built for contractor and manufacturer collaboration
  • 🌍 Useful for material-based emissions in building projects
Overview: One Click LCA helps construction suppliers align with EPD and embodied carbon standards. Its strength lies in standardized workflows, though it’s more specialized than general-purpose Scope 3 tools.

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Final Takeaway

Managing Scope 3 emissions isn’t just about calculation—it’s about collaboration, data consistency, and scalability.
Your software should help you turn supplier complexity into carbon clarity, automating what used to take weeks of manual data wrangling. Sustainly stands out for enabling this at scale through transparent AI, centralized sustainability data, and easy supplier collaboration — giving every stakeholder the tools to measure, manage, and reduce supply chain impacts.
Ready to see which tool fits your needs? Try Sustainly’s Scope 3 modeling workflows to transform supplier data into actionable insights.