Plan A vs Persefoni vs Sweep: emissions reporting compared

Plan A, Persefoni and Sweep solve the same problem from different angles. Plan A is the most focused on European CSRD reporting and decarbonisation planning. Persefoni is the most focused on external assurance and financed emissions. Sweep is the strongest on multi entity data management and value chain engagement. None of the three publishes list prices, and none has a Spanish language website.

Plan A, Persefoni and Sweep at a glance

All data comes from each vendor's own website, checked in August 2026. Where a vendor publishes nothing, the table says so rather than guessing.

Plan A: where it wins and where it falls short

Plan A builds its pitch on three pillars its own site spells out: measure, report and reduce. The measurement side rests on a corporate carbon footprint methodology certified by TÜV Rheinland in 2021 following the GHG Protocol, which lets the company say the calculation has been reviewed by a third party rather than simply asserted.

Its most distinctive piece for the European market is CSRD Manager, announced in November 2024. It is a reporting process manager more than a calculator: it guides identification of the required data points, manages the people who have to supply them, and lets external auditors into the workflow while the report is being built. For a company facing double materiality and a wide set of data points for the first time, process management is worth more than another dashboard, even after the revised ESRS of July 2026 cut more than 60 % of the mandatory datapoints.

Where it falls short. It does not explain on its site how it consolidates groups with many subsidiaries, it has no financed emissions line, and its audit documentation is less explicit than Sweep's. API access starts at the Pro plan, which constrains automation at entry level. And it publishes no prices.

Persefoni: where it wins and where it falls short

Persefoni is the one that leans hardest into the accounting angle. Its message is assurance grade emissions reporting for every major climate disclosure regulation, and the product splits in two: corporate and financial services. The financial line covers PCAF aligned financed emissions and portfolio company engagement, something neither Plan A nor Sweep's general pitch emphasises in the same way.

The other differentiator is commercial. Persefoni publishes two plans and the Pro tier is free, with no trial period and no time limit, aimed at companies with low to medium operational complexity. Its 2024 launch included SOC 1, SOC 2 and ISO 27001 certifications. That means you can run real carbon accounting without a procurement process, which is rare in this market.

Where it falls short. Its natural frame of reference is Anglo American: California SB 253 and SB 261, plus the TCFD and SASB legacy. That is worth keeping in mind when reading its site: the TCFD task force disbanded in 2023 and its recommendations now live inside IFRS S2, while SASB sits under the ISSB. It covers CSRD, but the European weighting is lighter than in Plan A or Sweep. It also does not detail multi entity consolidation or enterprise system integrations on its site, and there is no Spanish version.

Sweep: where it wins and where it falls short

Sweep is the closest of the three to a data platform. Its five modules are carbon accounting, ESG disclosure, value chain engagement, audit and assurance, and business intelligence. The line that best captures its approach is the one on its own site: upload your data once and use it across every reporting framework.

It is the only one of the three that explicitly describes a flexible data model for multiple entities, business units and geographies, and the only one with a dedicated audit module offering complete data lineage, immutable records and governance controls. If your problem is twelve legal entities, three ERPs and an auditor asking where every figure came from, that is precisely the problem Sweep claims to solve. It also states integration with ERP, procurement and HR systems, though it names no specific products.

Where it falls short. It publishes no pricing and no visible entry tier beyond an offer called Sweep Starter, which is also unpriced. Because the platform is designed for complexity, a 60 person company with only scope 1 and 2 will pay for capabilities it will not use. Its website is not available in Spanish either.

Which one should you choose?

The comparison only becomes useful once you map it to scenarios. These four come up most often.

• An auditor or investor will read your report. Persefoni for its assurance focus, or Sweep for its audit and lineage module. Plan A comes third in this specific scenario.
• CSRD is your main obligation and you are starting from zero. Plan A, thanks to CSRD Manager and its handling of the double materiality process. Sweep is the alternative if you also have many subsidiaries.
• You are a group with subsidiaries, several ERPs and thousands of suppliers. Sweep, without argument, for the multi entity model and automated value chain collection.
• You are a financial institution or a fund. Persefoni, for its dedicated financed emissions line and portfolio company engagement.

Before deciding, get clear on what actually forces you to report. Directive (EU) 2026/470, published on 26 February 2026, narrowed CSRD to companies with more than 1,000 employees and more than 450 million euros in turnover, with first reports covering financial years starting on or after 1 January 2027 and limited assurance only, with no planned move to reasonable assurance. If your company has dropped out of scope, buying a platform sized for full ESRS is overspending. If the relationship between the directive and the standards is unclear, the guide to CSRD and ESRS differences settles it in five minutes.

What none of the three covers

Four common gaps matter a lot if your company operates in Spain or Latin America.

1. The Spanish MITECO carbon footprint registry. None of the three documents support for registration or for the Calculo, Reduzco and Compenso seals. That matters because Royal Decree 214/2025 requires companies in scope to calculate their scope 1 and 2 footprint and produce a reduction plan, even though registry entry remains voluntary for private companies.
2. Language. As of August 2026 none of the three publishes a Spanish version of its website. For a team documenting in Spanish and audited in Spain, that translates into translation and review hours.
3. Environmental areas other than carbon. All three are carbon and ESG platforms. Waste, water footprint and product footprint sit outside or are only partly covered.
4. A visible entry price. Only Persefoni offers a free plan. For the others, every comparison requires a full sales process before you know whether the budget works.

Manglai as a fourth option for Spain and Latin America

If your company operates in the Spanish or Latin American market, there is a fourth option worth putting on the table. Manglai is a Spanish environmental management platform with clients in 70 countries, more than 30,000 users and 25 million tonnes of CO2 equivalent under management.

It differs from the three above on three specific points: it covers registration in the Spanish MITECO carbon footprint registry, it works in Spanish, Portuguese, English, French, Italian, Catalan and German, and it is not carbon only, since it also includes water footprint, waste management, product footprint and service footprint for logistics. On frameworks it states GHG Protocol, ISO 14064, ISO 14083, ISO 14046, the GLEC Framework, SQAS, PEF and CSRD. It does not publish list prices either: its Starter, Pro and Enterprise plans are quoted as annual subscriptions.

It does not replace Persefoni if your main report is PCAF financed emissions, nor Sweep if you have forty subsidiaries across fifteen countries. It belongs in the comparison when Spain or Latin America is the centre of gravity and you need local compliance alongside international reporting.

Frequently asked questions

Which of the three is best for CSRD reporting?

Plan A has the module most explicitly designed for the CSRD process, with CSRD Manager, data point management and external auditor involvement. Sweep is equally valid and adds multi entity handling and lineage. Persefoni covers CSRD, but its centre of gravity sits with Anglo American frameworks.

Is any of the three free?

Only Persefoni. Its Pro plan is free, with no trial period and no time limit, and is designed for companies with low to medium operational complexity. The Advanced plan is paid and unpriced publicly. Plan A and Sweep offer neither a free tier nor published rates.

Which handles supplier scope 3 emissions best?

Sweep, thanks to its supplier portals and automated collection inside the value chain engagement module. Persefoni also has a dedicated supplier data tool. In Plan A that capability lives in the Supply Chain+ module, with 500 suppliers included in the Enterprise plan. If you are just starting, review the 15 GHG Protocol scope 3 categories first so you know what you are asking for.

How much do Plan A, Persefoni and Sweep cost?

None publishes amounts, beyond Persefoni's free Pro plan. Any figure you find on review aggregators comes from users, not from the vendors. Always ask for a written quote with licence, implementation and support hours broken out.

Can all three be used to register with MITECO?

None documents specific support for the Spanish registry. You can use their GHG Protocol aligned calculation as the basis, but preparing the file and the official templates falls outside the tool.

What should I check beyond features?

Three things: whether the methodology aligns with the GHG Protocol, with ISO 14064-1:2018 or with both, for which it helps to understand the differences between the GHG Protocol and ISO 14064-1; whether you can export all activity data and applied factors on the day you leave; and whether support works in your language and time zone.

If you are comparing these three platforms from Spain or Latin America, test the result against the Manglai carbon footprint product and see what local compliance does to your total first year cost.