Read Sweep's pricing page carefully and you can tell who they're built for: a sustainability director at a listed European industrial with 400 tier-1 suppliers, a board that wants a CSRD story by Q2, and budget to hire one vendor for the next three years. Read Formist's pricing page and it's the opposite — a single ESG lead (often a finance person wearing a second hat) who has to file CBAM this quarter, CSRD next quarter, and a CDP questionnaire before October, and doesn't want to explain any of it to procurement.
Both of those people are running legitimate sustainability programs. They just have very different problems.
This isn't one of those comparisons where the vendor doing the writing pretends the competitor is a warmed-over spreadsheet. Sweep is a well-built product with real strengths, and the first half of this article is about those strengths honestly. The second half is about the specific cases where Formist is the better fit, and the last section is a recommendation you can actually use.
What Sweep and Formist have in common
Both are software platforms for corporate sustainability, not Excel templates dressed up as SaaS. Both handle the common framework stack — GHG Protocol Scope 1/2/3, CSRD/ESRS, CDP — and both can produce outputs that pass limited assurance if the underlying data is clean. Both are pricing off the premise that a platform plus a lightweight internal team should cost a fraction of a Big Four engagement.
Both were founded in the same short window of post-2020 climate-tech optimism, both have bilingual French/English teams, and both have customers who have genuinely cut their reporting time in half compared to what they were doing before. If you've seen one and not the other, it's easy to assume they compete head-on. They overlap, but they don't aim at the same buyer.
The shorthand: Sweep is a carbon and supply-chain data platform with a reporting layer on top. Formist is a compliance-reporting agent with a data layer underneath. That distinction drives almost every real difference.
Where Sweep wins
Sweep, founded in 2020 out of Paris and San Francisco, built itself around a specific hard problem: getting primary emissions data out of hundreds of suppliers who don't particularly want to give it to you. Their supplier engagement portal is, genuinely, the best execution of that idea on the market.
Scope 3 Category 1 at scale. If you're a food company with 600 ingredient suppliers, or a fashion brand with 280 tier-1 mills, or an industrial buyer with a thousand vendors across four continents — Sweep's supplier portal is purpose-built for that shape of problem. You send invitations, your suppliers log in, fill structured questionnaires, upload evidence, get automated reminders, and you watch a response-rate dashboard tick up from 12% to 70% over a quarter. The portal handles localization, multi-language reminders, data validation on the supplier side, and a reasonable approximation of the back-and-forth that used to happen by email. If your Scope 3 Category 1 footprint is the majority of your total emissions — which it is for most consumer-goods and manufacturing companies — that workflow is the product.
The UI. It's not a vanity point. Sweep is one of the few carbon platforms where the design doesn't fight the user. Procurement managers who have never seen an LCA can navigate it. Sustainability leads can demo it to boards without apologizing. For a buyer who is going to need budget approval from a CFO who has never heard of CSRD, "it doesn't look like SAP" is worth real money.
Enterprise references. Sweep has the logo wall — L'Oréal, Decathlon, Stripe, LVMH-adjacent fashion houses. If you're the ESG lead at a European listed company and your head of procurement wants a reference call, Sweep can produce one in your exact industry. That's not trivial. It means the product has been stress-tested against the kind of edge cases — scope boundaries, consolidation quirks, supplier data disputes — that only show up at scale.
Deep supply-chain data modeling. Sweep treats the supplier network as a first-class object, with product-level footprints, spend-based fallbacks, activity-based overrides, and the audit trail to explain each choice. Formist does this too, but not with the same fidelity on supplier primary data. If your business case is "I need to calculate Scope 3 Category 1 from actual supplier-provided emissions rather than industry averages," Sweep has a ten-mile head start.
This is what Sweep is good at, and pretending otherwise would insult the reader. It is also what you are paying for — public pricing isn't posted, but typical enterprise engagements land between €30,000 and €80,000 per year, with larger programs well above that. Onboarding is usually a multi-month exercise with a customer success team.
Where Formist wins
Formist is an AI-powered compliance platform built by WeCarbon. It works like a knowledgeable colleague sitting next to you — you talk to it, upload your documents, and it fills out sustainability compliance forms for you. It supports CBAM, GHG Protocol, CSRD/ESRS, EU Taxonomy, CDP, ISSB, LCA screening, SBTi, and 15+ other frameworks under a single subscription. That list of frameworks, and the way they share underlying data, is the thing Sweep isn't optimized to compete on.
Small or single-person ESG teams. Sweep's architecture assumes a buyer who has a team — a sustainability manager, one or two analysts, a procurement liaison. Formist assumes a buyer who is the team. The Formist AI agent handles the work that would otherwise fall on two junior analysts: extracting data from uploaded PDFs, mapping CN codes, drafting narrative disclosures, flagging inconsistencies, filling XBRL tags. If you're the only person at your company who knows what an ESRS datapoint is, Sweep's portal will feel like it was designed for someone else's org chart. Formist was designed for yours.
Multi-framework under one subscription. This is the big one. The same supplier invoice, the same electricity bill, the same production data feeds into CBAM, CSRD E1, CDP Climate, ISSB S2, and your GHG inventory. Sweep supports several of these frameworks, but it prices and scopes around carbon accounting as the core, with other frameworks as adjacent modules. Formist treats framework-switching as the default mode — the AI agent maintains one underlying data model and routes the same datapoint into whichever form is due next. For a mid-cap that owes CBAM quarterly reports, a CDP questionnaire in summer, an ISSB-aligned climate disclosure to investors, and a CSRD draft by year-end, "one subscription covers all of them" is a meaningful cost and operational difference.
Speed of filing. This is where the agent architecture earns its keep. A first CBAM quarterly filing on Formist takes about three hours — upload invoices, upload supplier data sheets, confirm a handful of extracted fields, export. A first CSRD draft takes a few days of real interaction, not a three-month consulting engagement. The Formist AI agent is not magic; it still needs your source documents and your judgment on materiality. But the mechanical work — the parts that used to consume 70% of an analyst's time — is no longer your problem.
AI document ingestion in any language. Upload a supplier production data sheet written in Chinese, a Spanish utility bill, a German calibration certificate — the Formist AI agent extracts the fields, normalizes the units, and asks you to confirm. Sweep supports multilingual supplier portals, which is different: it asks the supplier to type data in. Formist accepts whatever the supplier already has. For a mid-cap with 30 suppliers who mostly respond with scanned PDFs and broken English, that difference is the whole ballgame.
Usage-based pricing. Formist charges for what you actually use. A company with a quiet quarter — maybe just a single CBAM filing — pays for a single CBAM filing. A company with a heavy compliance calendar pays proportionally more. Sweep's pricing is committed annual, which is the right model for a 200-supplier portal rollout and the wrong model for a buyer whose compliance load varies quarter to quarter.
What Sweep is not trying to do
This is worth making explicit, because the two products are sometimes compared as if they're symmetric. They aren't.
Sweep is not optimized for the solo ESG lead at a mid-cap filing her first CBAM report next Tuesday. It can be used for that, but the onboarding time and the annual-committed pricing make it an awkward fit. Formist is not optimized for the Scope 3 lead at a €4B consumer goods company running a 500-supplier primary-data program. It can handle supplier data, but it doesn't have Sweep's procurement-team-facing portal polish, and it shouldn't pretend it does.
These are different products that happen to share a category label. A good buyer asks which problem is actually in front of them, not which brand has better Google rankings.
Price, roughly
Neither vendor publishes exact pricing, and made-up numbers would be worse than none. Here's the directional shape.
Sweep is sold as an enterprise subscription. Typical engagements for mid-to-large European companies land in the €30,000 to €80,000 per year range, with larger deployments — supplier portals for 500+ vendors, multi-entity consolidations, custom integrations — running well into six figures. You'll also budget onboarding time: weeks to months, depending on the size of your supplier base.
Formist is usage-based with a usage-linked subscription floor. A single-person ESG team handling CBAM quarterly plus one CSRD draft per year typically runs in the low thousands of dollars annually. A more active compliance calendar — several frameworks, monthly usage — scales up from there, but still rarely crosses mid-five-figures. Onboarding is measured in hours, not months, because there is no portal to configure and no supplier list to import before the first filing.
If you're comparing quotes, the scale difference is real. It reflects that the two products are solving different-sized problems.
Which one to pick
Real recommendation, not "it depends on your needs":
Pick Sweep if you have more than ~150 suppliers that you need to actively engage for primary emissions data, and supplier engagement is a named line item in your sustainability strategy. That's the job Sweep was built for and the job it does best. If your Scope 3 Category 1 footprint is the majority of your emissions, if your procurement team is willing to operationalize a supplier portal, and if you have the internal staffing to run a multi-quarter data-collection program — the money spent on Sweep will come back to you in data quality that a spreadsheet-based approach genuinely cannot match.
Pick Formist if you have fewer than ~50 suppliers needing primary-data engagement, and your day-to-day reality is filing regulatory forms across multiple frameworks with a small team. That's where Formist's agent architecture, multi-framework subscription, and document-ingestion capabilities compound. If most of your compliance pain is "CBAM is due in 10 days, CDP closes next month, and the finance team is asking about CSRD" — that's the shape of problem Formist was built around.
In between — 50 to 150 suppliers, a mix of supplier engagement and form filing — the honest answer is that both tools can work and the decision comes down to where you want your team's time to go. If you want to spend it running a supplier program, Sweep. If you want to spend it reviewing AI-drafted disclosures and filing, Formist. One isn't a better version of the other; they're optimized for different weeks of your calendar.
If you're already on Sweep and primarily struggling with multi-framework output (CBAM, CDP, ISSB on top of your carbon data) — you don't necessarily need to switch. You can run Formist alongside Sweep for the filing layer and keep Sweep's supplier portal for what it does well. The frameworks are the same either way; what changes is who does the form-filling.
That's the answer. Pick the tool that matches the problem actually in front of you, not the one your peer company in a different industry happens to use.
Formist is built by WeCarbon, a climate-tech company with offices in Shanghai, Paris, and Dubai. It supports CBAM, CSRD/ESRS, GHG Protocol, EU Taxonomy, CDP, ISSB, SBTi, and 15+ other sustainability frameworks under a single usage-based subscription.