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Sweep
Carbon and ESG data governance platform engineered for multi-entity corporate groups. Sweep's founding insight is that most organizations know how to calculate their emissions — they just cannot get the data from their subsidiaries in a state that makes calculation meaningful. The platform governs collection, enforces methodology, and produces the audit lineage that CSRD-grade assurance requires.
Persefoni
Audit-grade carbon accounting platform built for the moment carbon stopped being a communication exercise and became a regulated financial disclosure. Persefoni's design premise is that a carbon figure destined for external assurance must be treated with the same documentation discipline as a balance sheet item — every input sourced, every calculation versioned, every output traceable. For organizations where a misstated emissions figure is a compliance risk, not an embarrassment, this architecture is not a premium. It is the minimum viable standard.
Sweep
Persefoni
Sustainability Impact
18/20
19/20
🏆
Features & Capabilities
16/20
17/20
🏆
Value for Money
15/20
15/20
Ease of Use
16/20
16/20
Trust & Maturity
17/20
17/20
Pricing
enterprise
enterprise
Year founded
2020
2020
Best for
Multinational corporate groups and listed companies with 10 or more subsidiary entities that must consolidate carbon and ESG data across complex organizational structures — where the primary obstacle to CSRD compliance is not knowing how to calculate emissions, but not being able to get clean, governed, auditable data out of 25 different business units in time to produce a figure an assurance provider will not challenge.
Large enterprises facing mandatory carbon disclosure under CSRD or SEC climate rules where the disclosed figure will be reviewed by an external assurance provider — and financial institutions measuring financed emissions across loan books and investment portfolios under PCAF methodology, where the calculation problem is not generic but asset-class-specific and the regulatory consequence of getting it wrong is material.
Categories
Carbon Accounting
Carbon Accounting
Carbon Scopes
Scope 1 (Direct emissions)Scope 2 (Indirect energy)Scope 3 (Value chain)
Scope 1 (Direct emissions)Scope 2 (Indirect energy)Scope 3 (Value chain)
Key features
- Multi-entity consolidation architecture — a parent-subsidiary data model that preserves entity-level granularity while producing group-level rollup with full traceability. Designed around the organizational reality that a sustainability director in Paris cannot compel a plant manager in Seoul to submit clean data on deadline — and builds the workflow infrastructure that makes it happen anyway.
- Supplier Scope 3 engagement engine — structured primary data requests distributed to suppliers through a managed portal, with completion tracking, automated follow-up, and direct ingestion of supplier-provided emission factors into the group inventory. The gap between a Scope 3 figure built on EEIO spend proxies and one built on primary supplier data is not a rounding error. It is the difference between a disclosure an assurance provider accepts and one they qualify.
- Native audit lineage layer — an immutable record linking every disclosed figure to its source entity, data owner, input method, emission factor version, and submission timestamp. Under CSRD limited assurance — and increasingly under reasonable assurance — the assurance provider is not checking your arithmetic. They are checking whether your governance process can be documented and followed end to end. Sweep makes that documentation automatic rather than retrospective.
- Audit-grade carbon ledger — structures every emissions calculation as a documented, attributed, versioned financial-grade record. The emission factor applied is logged by version. The activity data input is linked to its source. The calculation methodology is referenced explicitly. The output can be followed by an assurance provider from disclosure line to underlying data without manual reconstruction. This is what "audit-grade" means in practice, as distinct from what it means in a vendor pitch deck.
- PCAF financed emissions — calculates Scope 3 Category 15 attributable emissions across corporate loans, listed equity, project finance, mortgages, and commercial real estate using Partnership for Carbon Accounting Financials methodology, with asset-class-specific attribution logic and PCAF data quality scoring by counterparty. For the bank whose financed emissions dwarf its operational footprint, this is not a module. It is the reason Persefoni is on the shortlist.
- Multi-framework regulatory alignment — maps a single governed emissions inventory to CSRD/ESRS, SEC climate disclosure, GHG Protocol, TCFD, SBTi, and CDP simultaneously, so the methodology consistency question between frameworks is resolved at the data layer rather than in the reporting layer. One audited inventory. Multiple compliance obligations. No re-collection.
Pros
- Most carbon accounting failures at group level are coordination failures, not calculation failures. Sweep is the only platform in this category architected specifically around that insight — and the multi-entity data model is genuinely different from carbon calculators that added a "group" feature as an afterthought. Organizations with 20 or more entities that have tried to consolidate via spreadsheet will recognize immediately what problem Sweep was built to solve.
- The Scope 3 supplier portal is among the most operationally significant capabilities in the platform. Spend-based Scope 3 estimation is fast, cheap, and increasingly inadequate — SBTi validation, CDP quality ratings, and CSRD assurance providers are all applying more scrutiny to Category 1 methodology. A managed portal that industrializes primary data collection and tracks supplier response rates year-on-year addresses this gap in a way that a general-purpose carbon tool cannot.
- Audit lineage that is generated automatically, rather than reconstructed under deadline pressure, is the practical difference between a first CSRD assurance engagement that goes smoothly and one that does not. The platform logs provenance continuously throughout the reporting cycle. When the assurance team arrives, they review a record — they do not trigger a documentation exercise.
- The audit-grade ledger architecture is the platform's defining advantage and the reason it sits on shortlists that other carbon tools do not reach. When a listed company's sustainability disclosure will face the same assurance standard as its financial statements — ISAE 3000 or equivalent — the question is not whether the carbon figure is approximately correct. The question is whether every element of the calculation can be documented, attributed, and followed by an assurance provider without the sustainability team spending three weeks reconstructing evidence. Persefoni's architecture answers that question before the assurance engagement begins.
- The financed emissions capability is the most technically sophisticated in the carbon accounting category, and it addresses a problem most general carbon platforms treat superficially. PCAF methodology is not uniform across asset classes: corporate loans use one attribution approach, listed equity another, project finance another. Data quality scoring varies by counterparty from a PCAF score of 1 (audited company-reported data) to 5 (modeled estimates). An institution that reports Scope 3 Category 15 without differentiating by asset class and data quality tier is producing a figure that no serious ESG analyst — let alone a supervisor — will accept without extensive qualification. Persefoni handles this differentiation natively.
- The multi-framework output architecture means an organization managing simultaneous obligations to CSRD, SEC climate disclosure, CDP, and SBTi reporting does not re-collect data for each framework or reconcile outputs that diverge because different parts of the team applied slightly different methodology. One governed inventory. One set of methodology decisions. Multiple compliant outputs. At the scale of organizations facing all these obligations simultaneously, that consolidation has measurable operational and cost implications.
Cons
- The organizational complexity that makes Sweep valuable is also the precondition for its value. A company with one legal entity, straightforward energy and travel data, and no supplier engagement program will pay enterprise pricing for multi-entity consolidation infrastructure it cannot use. For that profile, Normative, Watershed, or Persefoni deliver better value per unit of effort and cost.
- Implementation timeline is driven by organizational readiness, not platform configuration. The platform can be technically configured in weeks. Getting 25 subsidiary data owners — finance managers, operations leads, facility administrators who have other jobs and no sustainability background — identified, briefed, trained, and actively submitting quality data to a deadline takes months of structured change management. This is not a software caveat. It is the nature of the problem the software is solving. But buyers who treat it as a software project will be surprised.
- Sweep governs and consolidates. It does not build the decarbonization program that acts on what the data reveals. Organizations that have consolidated their ESG data and now need to manage reduction initiatives, track intervention progress, and connect emissions to budget allocation should evaluate Watershed for the program management layer, or SINAI Technologies for the marginal abatement analysis that informs where to invest.
- The controls, documentation requirements, and methodology governance that define Persefoni are genuinely valuable to organizations with assurance obligations and genuinely burdensome to organizations without them. A company seeking a directional internal carbon footprint for operational awareness, without any near-term external assurance requirement or investor scrutiny, will pay for audit infrastructure that generates no return at their current stage. For that buyer, Normative's data-driven accuracy or Greenly's accessibility delivers more value per unit of investment.
- Persefoni is a single-entity or financial-institution platform with deep methodology rigor. It is not a multi-entity group consolidation platform. A corporate group whose primary challenge is coordinating data collection across 30 subsidiaries with inconsistent methodology — where the governance problem precedes the calculation problem — will find that Persefoni's ledger depth is applied to a data foundation that is not ready to receive it. That organizational coordination challenge is Sweep's specific design purpose, and the two platforms address sequential problems rather than competing ones.
- The platform delivers its full value when the underlying activity data supplied to it is managed with equivalent rigor. Persefoni documents and versions every calculation it performs. What it cannot do is compensate for poorly structured, incomplete, or inconsistently defined input data. The assurance advantage materializes when both the governance of the data collection and the governance of the calculation are operating at the same standard. Organizations that have resolved the first problem will find Persefoni addresses the second precisely. Organizations that have not should resolve it first.
