Top supplier engagement tools for Scope 3 success

Updated: 29 July 2026. Vendor details reflect public information at that date.

Scope 3 supplier data still arrives by spreadsheet, and most of the work is chasing it. Engagement tools promise to fix that, and they do different jobs: some collect data, some score suppliers, some model products, and a few help you act on what you find.

This post compares six platforms procurement and sustainability teams shortlist for supplier engagement: what each one is built for, and where each one stops.

What makes a good supplier engagement tool?

A supplier engagement tool earns its place when it produces an emissions figure a third-party auditor can follow and an action a category manager can take. Six things to check:

• Supplier-specific emissions data, rather than spend-based averages standing in for it
• Reduction recommendations tied to the individual supplier, not generic guidance
• Forecasting and target setting, so you can see whether a plan reaches the target
• Low burden on the supplier: no new portal, no duplicate data entry
• Alignment with the GHG Protocol Scope 3 Standard, SBTi and CSRD reporting
• Provenance on every figure, with the source and change history a third-party auditor can follow

The top tools, and what each one is best at

Six platforms that come up on procurement and sustainability shortlists, and the job each one does well.

1. DitchCarbon, best for verified supplier engagement at scale

What it does:

• DitchCarbon provides verified emissions data for over 2 million organisations, so procurement, sustainability and finance teams can measure and act on supply chain and portfolio emissions from one source.
• The Portal calculator is verified to ISO 14064-3, limited assurance, by UL Solutions, renewed annually. The emission factor methodology for spend-based Scope 3 categories 1 and 2 was independently assessed by Globus Thenken in August 2025. Both documents sit on the trust centre.
• It is the only specialist Scope 3 tool with third-party assurance of its calculation methodology. The verification benchmark shows every vendor checked, with the verifier and the evidence for each.
• Supplier figures resolve to the right legal entity through DUNS, LEI and ISIN identifiers, and every figure carries its source and change history.
• Forecasting shows which actions close the gap to a target, at supplier, category or group level.
• Requests reach suppliers already populated with what is known, which gets higher response rates than a cold survey.

Best for: teams that need audit-ready supplier numbers backed by ISO 14064-3 verification rather than a claim, and a plan to act on them. A recent deployment reached about 60% of a large supplier base within 2 weeks.

2. StepChange, best for broad emissions visibility

What it does:

• Scope 3 emissions dashboard aligned to the GHG Protocol
• Basic forecasting, with limited supplier-level reduction guidance

Best for: teams that want a footprint in view quickly, before moving on to supplier-specific action.

3. Makersite, best for product-level lifecycle modelling

What it does:

• Models supply chain emissions at component and bill of materials level
• Brings cost, carbon and compliance into one view
• Built around product decisions rather than supplier engagement workflows

Best for: product and R&D teams testing the impact of a material, component or design change.

4. EcoVadis, best for ESG scoring at scale

What it does:

• ESG and carbon scoring built on supplier disclosures
• Assessments that scale across a global supplier base
• Scores rather than emissions forecasts or reduction plans

Best for: procurement teams that want one consistent sustainability signal across vendors. If you already hold EcoVadis scorecards, you can turn them into structured emissions data.

5. IntegrityNext, best for ESG risk screening in procurement

What it does:

• Screens suppliers across ESG and compliance risk categories
• Carries carbon reporting alongside the risk view
• Risk-led, without emissions forecasting or reduction planning

Best for: organisations using risk scores to inform sourcing decisions.

6. Sweep, best for carbon accounting with supplier surveys

What it does:

• Corporate carbon accounting across all three scopes
• Supplier survey tools for collecting primary data
• Survey-led collection, rather than supplier data supplied for you

Best for: teams whose main job is corporate disclosure, with supply chain data as one input.

Tool comparison snapshot

Verification status follows our verification benchmark, which names the verifier and the evidence for every vendor it checks. "None published" means the vendor was checked and no public software or methodology verification was found. "Not in our benchmark" means the vendor has not been checked there yet, not that no verification exists. Every other column reflects public product information at July 2026.

Final thoughts

Collecting supplier data is the easy half. The tools that move a Scope 3 number are the ones that hand you a supplier-level figure with its source attached, then show which action closes the gap to your target. Shortlist on that, and on whether the methodology behind the number has been verified by someone outside the vendor.

See the coverage on your own supplier list

DitchCarbon brings supplier-specific data, verified methodology and forecasting together, inside the procurement and sustainability tools your team already runs. Request a walkthrough to see the coverage on your own supplier list.

Being asked for emissions data rather than asking for it? Claim your company profile and answer once, then reuse it.