Buying guide
Carbon accounting platforms in an honest map of the market
Live demo · Scope Classifier
No signup neededSee your own spend classified to GHG Protocol scopes in about a minute.
| Shape | Examples | Strengths | Trade-offs |
|---|---|---|---|
| Enterprise suite | Persefoni, Watershed, Sweep | Depth, integrations, decarbonization programs | Enterprise tiers quoted after a sales call, long implementation; built for companies with data teams (Persefoni also offers a free single-user Pro tier) |
| Consultant-led | Greenly, Normative, boutique firms | Human help with a first inventory | The hours are the product, so it scales like a consultancy; methodology depth varies |
| Ledger-first software | CarbonAccounting.ai | Runs on your AP data before you talk to anyone; published pricing; evidence per line | Young product; smaller partner ecosystem than the incumbents |
Most incumbents quote enterprise pricing only after a sales call, so check where any contract value on a comparison site comes from. The exceptions worth knowing: Persefoni publishes a free single-user Persefoni Pro tier and lists its Advanced platform on AWS Marketplace from $55,000 a year, and Vendr publishes buyer data on Watershed contracts. We publish ours on the pricing page and let you run the core classification on your own data in the demo above, before any email address changes hands. A deeper look at the named vendors is on the Persefoni alternatives page, with the LCA-data-heavy end of the market covered on Sphera carbon accounting alternatives, and the vendor landscape overview lives in our carbon accounting companies post.
Five questions that separate platforms fast
- 01 Can you see the product working on your data before a sales call?
- 02 Is pricing published, or discovered at the end of a procurement cycle?
- 03 Does every figure resolve to a source line and a factor, or to a black box?
- 04 When the method or factor set changes, is last year's number still reproducible?
- 05 Who does the classification work: your team, their consultants, or reviewed AI?
Answering those five usually narrows the shape before it narrows the vendor. If the outcome you owe is a measured company footprint, the relevant category is carbon footprint software; if it is a disclosure someone else reviews, it is carbon reporting software; and if you need the number maintained and reduced year over year, carbon emissions management software. Most tools claim all three and are genuinely good at one.
Persefoni alternatives by buyer type
The best Persefoni alternatives depend on why Persefoni is on the list. A finance-led enterprise that wants the Advanced platform usually compares it with Watershed. A company that started on the free Pro tier and now needs more users, CDP reports or a supplier program compares paid tiers. A mid-market company with one SB 253, CDP or customer deadline often needs neither and is better served by a tool that runs on its accounts payable export. The table uses only prices the vendors or a named buyer-data source publish.
| Platform | Best for | Published price |
|---|---|---|
| Persefoni | Finance-led enterprises and financial institutions | Pro free for one user, with paid report add-ons; Advanced $55,000 to $260,000 a year by revenue band on AWS Marketplace |
| Watershed | Funded reduction programs, supplier engagement, an SB 253 assurance guarantee | No price page; Vendr buyer data shows a median near $70,000 a year |
| Hydrus | Mid-market teams that also want AI governance tooling | Sustainability Platform from $2,000 a month |
| Aclymate | Small companies starting with a directional estimate | Navigator $45 a month and Aclymate One $448 a month at the 1 to 10 employee setting, billed annually |
| Greenly | Companies that want a managed first inventory | Plans listed with "Get in touch", no numbers |
| CarbonAccounting.ai | A first evidenced inventory from the AP export, for a customer, CDP or SB 253 date | Ledger $2,340 a year, Compliance $7,740 a year |
Each row has a full comparison: Persefoni alternatives, Persefoni pricing, Watershed alternatives, Hydrus alternatives, Aclymate alternatives and Greenly alternatives. For a ranked shortlist, see the best carbon accounting software.
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