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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.
Plan A
Plan A is a Berlin-born carbon accounting and decarbonization platform, founded in 2017 and acquired by Diginex in January 2026. Built for European enterprises navigating CSRD obligations alongside active emissions reduction, it combines TÜV Rheinland-certified carbon accounting with science-based decarbonization planning in a single workflow — with an explicit position that reduction must come before reporting.
Persefoni
Plan A
Sustainability Impact
19/20
🏆
15/20
Features & Capabilities
17/20
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15/20
Value for Money
15/20
16/20
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Ease of Use
16/20
16/20
Trust & Maturity
17/20
🏆
14/20
Pricing
enterprise
enterprise
Year founded
2020
2017
Best for
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.
European mid-market to large enterprises at Stage 3 maturity — organizations with a CSRD obligation on the horizon, a commitment to SBTi, and a need to move from compliance baseline to active decarbonization plan within a single platform.
Categories
Carbon & ClimateCarbon Accounting
Carbon & ClimateCarbon 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
- 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.
- TÜV Rheinland-Certified Carbon Accounting — GHG Protocol and SBTi Aligned Plan A's carbon accounting methodology is certified by TÜV Rheinland and aligned with the GHG Protocol Corporate Standard and SBTi criteria. The platform covers Scope 1, 2, and 3 emissions across all 15 categories using AI-assisted data mapping, automated anomaly detection, and customizable calculation methods developed in collaboration with a Scientific Advisory Board. The certification is operationally significant for European enterprises: it provides documented third-party confirmation of methodology alignment that can be presented to auditors, CSRD reporting reviewers, and SBTi technical staff without requiring the organization to reconstruct its methodology rationale from scratch.
- Decarbonization Planning and ROI Scenario Modeling Plan A is built on the premise that carbon accounting exists to produce a reduction plan, not merely a disclosure. The platform includes science-based decarbonization scenario modeling — allowing organizations to test the emissions impact and financial ROI of specific reduction initiatives before committing resources. Scenarios can be modeled at Scope level, by business unit, by geography, or by supplier category. The output is a structured reduction roadmap aligned with SBTi pathways, with progress tracking built into the same platform as the measurement. For organizations that need to demonstrate a credible decarbonization trajectory — to a board, a regulator, or an SBTi reviewer — the scenario tool connects the baseline footprint to a forward-looking strategy in a way that static reporting cannot.
- CSRD-Aligned Reporting and ESG Framework Integration Plan A's reporting module supports CSRD disclosure preparation with pre-structured ESRS E1 outputs covering GHG emissions, transition risk indicators, and climate targets. The platform is SOC 2 and GDPR compliant, with an audit trail maintained across data ingestion, calculation, and output generation. Through the Diginex acquisition (completed January 15, 2026), Plan A's carbon accounting capability is being integrated with Diginex's broader ESG reporting infrastructure spanning 19 global frameworks — extending the platform's reach beyond carbon-only disclosure toward a more complete CSRD data point coverage. This integration is in progress as of mid-2026; buyers evaluating the combined platform should confirm the current state of ESRS social and governance coverage with the vendor directly.
Pros
- 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.
- Plan A's explicit positioning — that decarbonization must come before disclosure — is a philosophical stance with operational consequences. The platform is built so that the measurement leads directly to a reduction roadmap, and the reduction roadmap leads to a compliant disclosure, in a single workflow. For European mid-market organizations that need to demonstrate a credible SBTi pathway alongside their CSRD reporting obligations, this sequence is built into the product rather than requiring a separate strategy engagement. The TÜV Rheinland certification of the methodology provides the documentation anchor that makes the resulting footprint defensible in both an SBTi technical review and a CSRD assurance engagement.
- The platform's accessibility for organizations without a large sustainability team is a practical differentiator at the mid-market level. AI-assisted data mapping, automated anomaly detection, and ready-to-use calculation methods reduce the time and specialist knowledge required to build a first Scope 3 inventory. The AI-driven data processing retains organizational context — memorizing naming conventions and custom data structures across reporting cycles — so the second year of carbon accounting takes materially less time than the first. For organizations that cannot justify a full-time sustainability data function but face a CSRD reporting obligation for FY2027 data, this reduction in operational friction is financially material.
- The Diginex acquisition opens a strategic dimension that Plan A as a standalone platform could not offer: integration with ESG reporting coverage across 19 global frameworks, supply chain transparency infrastructure, and AI-driven analytics from Matter DK. For Plan A's existing customer base — which includes BMW, Deutsche Bank, Visa, Chloé, and Trivago — the combined platform trajectory points toward an end-to-end solution that links regulatory compliance, value chain emissions, and decarbonization strategy. The integration is a work in progress, and buyers should evaluate the current state carefully. But the strategic direction addresses the fragmentation problem that carbon-only platforms structurally cannot solve alone.
Cons
- 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.
- The Diginex acquisition, completed January 15, 2026, introduces a transition period whose duration and impact on product stability are genuinely uncertain. Integration of two distinct technology stacks — Plan A's carbon accounting engine and Diginex's ESG reporting infrastructure — is a complex technical process. The platform's roadmap will be shaped by the priorities of the combined entity rather than by Plan A's standalone strategy. Organizations evaluating Plan A in mid-2026 should ask explicitly about product roadmap commitments, data migration guarantees, and the contractual terms that apply if the integration changes the platform materially. This is not a reason to avoid the platform; it is a reason to evaluate with the same diligence applied to any software that has recently changed ownership.
- Plan A's Scope 3 depth and enterprise scalability are competitive for the European mid-market but less developed than the specialist tools at the enterprise tier. Organizations with highly complex global supply chains, a Scope 3 Category 1 inventory spanning thousands of suppliers in multiple geographies, or significant financed emissions (PCAF Category 15) will encounter the ceiling of Plan A's methodology before the ceiling of their own data complexity. <a href="/ai_tool/watershed/">Watershed</a> is purpose-built for the former; <a href="/ai_tool/persefoni/">Persefoni</a> is purpose-built for the latter. Plan A is not trying to compete with either on those dimensions — it is not positioned there by design — but buyers evaluating across the full market should calibrate expectations accordingly.
- Plan A's pricing is enterprise-negotiated and not publicly disclosed, which places it in the same evaluation challenge as Watershed and Persefoni. Unlike Normative, which offers two named tiers (Essential and Premium), Plan A does not publish a tier structure. For mid-market organizations where budget predictability is a constraint, the absence of published pricing creates friction at the evaluation stage. The venture funding history — approximately $27 million raised between 2021 and 2023 — and the Diginex acquisition at approximately €55 million suggest a platform that is priced for the organizations that can commit at enterprise contract level, not for teams evaluating on a trial or annual-renewal basis.
