Persefoni alternatives for corporate Scope 3: 5 platforms compared (2026)

Teams that look past Persefoni for corporate Scope 3 usually have the inventory in hand and want the supplier lines to carry real figures sooner. Persefoni covers Scope 1, 2 and 3 across all 15 categories, and its own guidance is to start with estimates and improve data quality over time. This page compares five alternatives on how fast that improvement happens: how much of a supplier list carries the supplier's own figure on day one, what each supplier is asked to do, and what tracking looks like once the baseline is set. DitchCarbon is the Scope 3 emissions platform for large organisations. It combines verified emissions data for over 2 million organisations, built on primary emissions data wherever it exists, with the tools procurement, sustainability and finance teams need to measure supply chain and portfolio emissions and deliver measurable reductions.

For portfolios and PCAF data quality, see the financed emissions version of this comparison.

For the wider market, see our comparison of the best Scope 3 software and of automated supplier emissions tracking, and for how requests work in DitchCarbon, see supplier engagement.

Persefoni described from its own pages, checked 30 October 2026. Other vendors checked between 23 September and 30 October 2026.

Why do corporate teams look for a Persefoni alternative?

The Category 1 number is in, and the next question is which suppliers to act on. The triggers we hear most often:

• The supplier lines are still estimates. A spend-based line moves only when procurement spends less, so a supplier's real reduction never shows up in it.
• Supplier figures wait for suppliers. A supplier's own number arrives once it has built a footprint and shared it, and most of a large list has not.
• Requests are a tier decision. On Persefoni's published plans, sending requests to suppliers sits in the paid Advanced tier; the free Pro tier responds to requests.
• The team wants a plan per supplier. Reporting is solved, and the work now is which suppliers carry the emissions, what each is on course for, and what to ask for.

Can you run DitchCarbon alongside Persefoni?

Yes. Persefoni is a system of record for the full inventory and the disclosure. Run alongside it, DitchCarbon becomes the data layer feeding it: each supplier line calculated by the most accurate method available, with the source document behind every figure, so the inventory you already report from starts on supplier-specific (primary) emissions data wherever a supplier has published. Nothing about the reporting stack changes.

Run on its own, DitchCarbon is the platform and the system of record for Scope 3: measure the organisations you buy from, engage the ones that matter for the detail you need, forecast each against its own target, and plan the reduction. It integrates into the procurement, ERP or sourcing system the team already runs.

Settle this before the shortlist. If the inventory is solved and the supplier data underneath it is the work, you are choosing a data layer, and half the comparison below stops mattering.

Which Persefoni alternatives put supplier figures in the baseline fastest?

DitchCarbon, because the supplier's own published figure is in place before anyone is asked. The others start from averages, imports or analyst research, and improve as suppliers reply.

"Not described" means the vendor's public pages, as checked, do not describe the feature. It does not mean the feature cannot exist.

How do the 5 alternatives compare?

Persefoni, the reference point

Persefoni covers Scope 1, 2 and 3 across all 15 Scope 3 categories, and in its own words lets teams "start with estimates and progressively improve data quality". Its route to supplier data is the supplier itself: Persefoni Pro is free, single user and calculates annually, so a supplier with no footprint builds one there and shares it. Its supplier engagement page lists the Scope 3 Data Exchange as coming soon. On the paid Advanced plan, each customer gets a Customer Success Manager and a Climate Solutions Expert, with done-for-you professional services as an add-on. DitchCarbon holds the figure the supplier has already published, so a supplier line improves the day the baseline is built, and the supplier is asked only for detail beyond it.

1. DitchCarbon

DitchCarbon is a specialist Scope 3 carbon accounting platform for acting on supply chain emissions without adding to suppliers' survey load: a spend file ranked the same week, numbers you can defend within 2 weeks, and a plan for each supplier that matters. It starts from verified emissions data for over 2 million organisations, built on primary emissions data wherever it exists: published GHG inventories, and service and product-level carbon footprints, from sources including CDP responses, EcoVadis scorecards, SBTi targets and data that suppliers declare on their own profiles. Suppliers are matched by entity resolution against DUNS, LEI and ISIN identifiers, and from a company name alone where that is all the purchase file holds. We calculate on product data, activity data and supplier-specific spend, and only when all else fails, industry-level spend.

Requests go to the suppliers carrying the most emissions with the least disclosed, prepopulated with what each has already published, so the supplier adds only the detail you need to reduce or report accurately. The method is the same for 100 suppliers as for 10,000, it runs in production on supply chains of over 100,000 suppliers, and a recent deployment reached 70% coverage of emissions with primary data within 2 weeks. Each supplier is then forecast against the trajectory its own target requires, rolled up to category or portfolio level. Every figure carries its source and change history, and the Portal calculator is verified to ISO 14064-3, limited assurance, by UL Solutions, renewed annually.

Best for: large enterprises that want to cut supply chain emissions this year without adding to their suppliers' survey load. AI reads what suppliers have already published, a team of 15 analysts checks it, and each supplier that matters comes with a reduction plan drawn from a named peer that has already made the cut.

2. Watershed

Watershed's supply chain module ranks suppliers by emissions impact and climate maturity, and sends data requests, target commitments and reduction plans through a guided portal. Supplier responses replace industry averages in the footprint as they arrive. DitchCarbon holds verified data on over 2 million organisations, so the supplier's own figure is in place before a request goes out, and requests are aimed at the suppliers where a better figure would change the total.

Best for: companies that put one platform for inventory and suppliers ahead of the load on suppliers: until a supplier replies through the portal, its line stays on an industry average.

3. Sweep

Sweep is a full-inventory carbon accounting platform with a supplier module: surveys and supplier portals, free accounts for surveyed suppliers, hotspot analysis by supplier and category, and joint reduction targets tracked supplier by supplier. It imports supplier data from CDP, EcoVadis, S&P and the SBTi. Run alongside Sweep, DitchCarbon supplies supplier figures calculated by the most accurate method available for each line.

Best for: ESG teams that want one tool for every scope and broader ESG data, with supplier surveys run from it for the figures it cannot import.

4. Normative

Normative's route to supplier data runs through people: surveys, a shared Carbon Network, an EcoVadis integration, and its own analysts researching your most important suppliers. Its reach grows with the number of suppliers someone chooses to research. In September 2026 Normative and Greenly announced they are merging, with Normative's methodology now feeding Greenly's platform (announcement, 10 September 2026). DitchCarbon covers the whole list from verified data before anyone is chosen, with the source document behind every figure, and sends requests only where a better figure would change the total.

Best for: companies whose list of suppliers that matter is short enough to research by hand, inside a full inventory platform.

5. CO2 AI

CO2 AI does product and corporate footprinting at enterprise scale, with supplier data exchanged through the PACT network and consortium pools. A product footprint arrives once a tier-one supplier has produced one and exchanged it. DitchCarbon validates the product footprints suppliers have already published, matches them to the items you buy, and carries the supplier's company figure wherever a product footprint does not exist yet.

Best for: enterprises whose tier-one suppliers already produce and exchange product footprints through the network.

How should you test a Persefoni alternative on your own supplier list?

Send each vendor a sample of your supplier list and ask for two numbers: how many suppliers carry their own figure before any request goes out, and what share of the resulting baseline still rests on an industry average. The first is how much of the list you can act on now. The second is what requests still have to deliver. DitchCarbon shows both as numbers, because every line records the method that produced it.