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SB253 Vendors

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Narrow the directory by category, by the standards and frameworks a vendor names, and by other facts we have published. Results are alphabetical, not ranked.

Filters use what each vendor states in the sources we recorded. Naming a standard does not mean a vendor is certified, accredited or approved under it, and a mention of SB 253 is not a claim that the vendor can make any company compliant. See the methodology for how facts are collected, or browse vendors by standard.

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Showing 51 of 51 vendors

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  • Aclymate

    Carbon accounting software paired with optional expert services and sustainability certifications, aimed at small and mid-sized businesses.

    Category: Carbon accounting software

    Names: CDP, CSRD and ESRS

  • Anthesis Group

    Sustainability consultancy offering GHG inventory development, Scope 1/2 measurement and Scope 3 screening, with its own inventory software and California regulation pages.

    Category: GHG accounting consulting

    Names: GHG Protocol, ISO 14064, CSRD and ESRS, TCFD, Science Based Targets initiative (SBTi)

  • Apex Companies

    Firm whose sustainability page describes verification of GHG emissions and other sustainability metrics, citing ISO 14064-3, ISSA 5000 and AA1000AS.

    Category: Assurance and verification

    Names: ISO 14064, AA1000

  • Aster Global Environmental Solutions

    Firm offering third-party auditing, validation and verification of GHG inventories, including organizational-level verification, and states ANAB accreditation under ISO 14065.

    Category: Assurance and verification

    Names: ISO 14064, ISO 14065

  • BDO USA

    Accounting firm describing limited and reasonable sustainability assurance, readiness assessments, and GHG inventory support, and referencing SB 253 reporting.

    Category: Assurance and verification

    Names: GHG Protocol, CSRD and ESRS, ISSB standards (IFRS S1 and S2)

  • Benchmark Gensuite

    EHS and sustainability software including Scope 1-3 GHG tracking, air emissions modules, disclosure management and CSRD-oriented reporting.

    Category: ESG and climate reporting platforms

    Names: CDP, CSRD and ESRS, TCFD, GRI Standards, SASB Standards

  • BSI Consulting

    BSI's consulting page describes GHG accounting and reporting support (Scope 1-3 inventories, verification preparation); BSI's separate pages also list ISO 14064-1 verification.

    Category: GHG accounting consulting

    Names: GHG Protocol, ISO 14064, CDP, TCFD, GRI Standards, SASB Standards

  • Bureau Veritas

    Testing/inspection/certification group offering carbon footprint verification including organizational Scope 1-3 verification, referencing ISO 14064 and the GHG Protocol.

    Category: Assurance and verification

    Names: GHG Protocol, ISO 14064

  • Carbon Analytics

    AI-based carbon accounting platform for tracking Scope 1-3 emissions with automated data collection, supplier mapping and report templates.

    Category: Carbon accounting software

    Names: GHG Protocol, CDP, CSRD and ESRS, GRI Standards, Science Based Targets initiative (SBTi)

  • Carbon Trust

    Organization whose footprinting and reporting page describes helping corporates, cities and financial institutions measure Scope 1, 2 and 3 emissions against recognized standards.

    Category: GHG accounting consulting

    Names: GHG Protocol, ISO 14064, ISO 14067, PCAF

  • Carbonfact

    Environmental data platform for apparel, textile and footwear brands, offering GHG inventories, product LCAs and framework reports.

    Category: Carbon accounting software

    Names: CDP, CSRD and ESRS

  • Climatiq

    Provider of an emission-factor database and API, plus tools for managing emission factors and calculating product carbon footprints.

    Category: Emissions data and factors

    Names: GHG Protocol, ISO 14067

  • Cority

    EHS and sustainability software offering GHG emissions tracking across Scope 1-3, ESG targets and KPIs, and reporting to global frameworks.

    Category: ESG and climate reporting platforms

    Names: CDP, CSRD and ESRS, ISSB standards (IFRS S1 and S2), TCFD, GRI Standards, SASB Standards

  • Crowe

    Accounting and advisory firm whose US page describes GHG emissions accounting help across Scopes 1-3, based on the GHG Protocol, including readiness reviews of existing inventories.

    Category: GHG accounting consulting

    Names: GHG Protocol

  • Cventure LLC

    Firm describing third-party GHG verification at project, facility, corporate, municipal and national levels for disclosure programs and registries.

    Category: Assurance and verification

    Names: CDP

  • Deloitte (US)

    Accounting and advisory firm whose US page describes sustainability assurance integrated with financial audit, plus GHG inventory and carbon assessment services.

    Category: Assurance and verification

    Names: CSRD and ESRS, ISSB standards (IFRS S1 and S2), GRI Standards

  • Diligent ESG

    Diligent's ESG product with a carbon calculator covering Scope 1-3, stakeholder data collection for Scope 3 and multi-report data reuse.

    Category: ESG and climate reporting platforms

    Names: GHG Protocol, ISO 14064

  • DNV

    Assurance and certification group whose pages describe third-party verification of corporate carbon footprints and GHG emissions against ISO 14064-1 and the GHG Protocol.

    Category: Assurance and verification

    Names: GHG Protocol, ISO 14064, ISO 14065, CDP, CSRD and ESRS

  • ecoinvent

    Environmental database organization providing life cycle inventory datasets, API access, and climate-indicator and GHG-breakdown packages.

    Category: Emissions data and factors

  • ERM

    Sustainability consultancy whose pages describe sustainability reporting and disclosure support and GHG accounting work, including a private-equity GHG standard using the GHG Protocol.

    Category: GHG accounting consulting

    Names: GHG Protocol, CDP, CSRD and ESRS, ISSB standards (IFRS S1 and S2), TCFD, GRI Standards, SASB Standards, PCAF

  • ERM CVS

    Independent assurance and verification arm of ERM Group; its SB 253 page cites ISAE 3000, ISAE 3410 and ISO 14064-3 for GHG assurance and offers assurance-readiness assessments.

    Category: Assurance and verification

    Names: GHG Protocol, ISO 14064

  • EY (US)

    Professional services firm whose US climate page lists assurance over data and disclosures and greenhouse gas and energy audits.

    Category: Assurance and verification

    Names: TCFD

  • Green Project Technologies

    Supply chain decarbonization platform combining supplier engagement, Scope 1-3 carbon accounting and renewable energy procurement; absorbed the Emitwise and Optera platforms.

    Category: Carbon accounting software

    Names: GHG Protocol, CDP, CSRD and ESRS, Science Based Targets initiative (SBTi)

  • IBM Envizi ESG Suite

    IBM's ESG data and emissions software covering Scope 1-3 GHG accounting, financed emissions, decarbonization and ESG reporting.

    Category: Carbon accounting software

    Names: GHG Protocol, CSRD and ESRS

  • Intertek

    Assurance provider stating independent GHG validation and verification to ISO 14064-3, with ISAE 3000 and AA1000 engagement options for Scope 1, 2 and 3.

    Category: Assurance and verification

    Names: ISO 14064, AA1000

  • KERAMIDA

    Environmental consultancy offering GHG assessments and inventories (Scopes 1-3), verification services, and SB 253 and New York reporting assistance.

    Category: GHG accounting consulting

    Names: GHG Protocol, ISO 14064, ISO 14067, CDP, CSRD and ESRS, ISSB standards (IFRS S1 and S2), TCFD, Science Based Targets initiative (SBTi), AA1000

  • KPMG (US)

    Professional services firm whose US page describes limited or reasonable assurance over metrics including greenhouse gas emissions, and GRI and SASB reports.

    Category: Assurance and verification

    Names: GRI Standards, SASB Standards

  • LRQA

    Certification and assurance group offering ISO 14064 validation and verification of organizational carbon footprints, plus GHG inventory services.

    Category: Assurance and verification

    Names: ISO 14064, ISO 14067

  • Microsoft Sustainability Manager

    Microsoft product for recording, calculating and reporting emissions, water and waste data, with Scope 1-3 calculations and dashboards.

    Category: Carbon accounting software

    Names: GHG Protocol, CSRD and ESRS

  • Novisto

    Sustainability management software for ESG data collection, carbon emissions measurement, peer benchmarking and multi-framework disclosure reporting.

    Category: ESG and climate reporting platforms

    Names: CDP, CSRD and ESRS, ISSB standards (IFRS S1 and S2), TCFD, GRI Standards, SASB Standards

  • Persefoni

    Software for carbon accounting and sustainability management covering Scope 1-3 measurement, reporting, decarbonization planning and financed emissions.

    Category: Carbon accounting software

    Names: GHG Protocol, CSRD and ESRS, TCFD, SASB Standards, Science Based Targets initiative (SBTi), PCAF

  • Plan A

    Carbon accounting and decarbonisation software for measuring, reporting and reducing corporate emissions, with AI features.

    Category: Carbon accounting software

    Names: GHG Protocol, CSRD and ESRS

  • Pulsora

    Sustainability and carbon management platform that centralizes ESG data, calculates Scope 1-3 emissions and prepares disclosures, for corporates and private capital firms.

    Category: ESG and climate reporting platforms

    Names: CSRD and ESRS, GRI Standards

  • PwC (US)

    Professional services firm whose US page describes independent ESG assurance, including over selected metrics such as GHG emissions.

    Category: Assurance and verification

    Names: GHG Protocol, TCFD, SASB Standards

  • Ramboll

    Engineering and consulting firm whose insight article says it can support Scope 1 and 2 inventories; other pages describe climate calculations and decarbonization consulting.

    Category: GHG accounting consulting

    Names: GHG Protocol, Science Based Targets initiative (SBTi)

  • RSM US

    Accounting and consulting firm whose US page lists ESG attestation, greenhouse gas assurance and agreed-upon procedures.

    Category: Assurance and verification

  • Salesforce Net Zero Cloud

    Salesforce ESG product for tracking Scope 1-3 emissions, forecasting toward net zero goals, and building framework-specific sustainability reports.

    Category: Carbon accounting software

    Names: CDP, CSRD and ESRS, GRI Standards, SASB Standards

  • SAP Sustainability Solutions

    SAP's ERP-connected sustainability portfolio covering carbon accounting through a green ledger, footprint management and ESG steering and reporting.

    Category: Carbon accounting software

    Names: CDP, CSRD and ESRS, ISSB standards (IFRS S1 and S2), Science Based Targets initiative (SBTi)

  • SCS Global Services

    Third-party GHG inventory verification body covering Scope 1, 2 and 3, with verification against GHG Protocol and several program rules.

    Category: Assurance and verification

    Names: GHG Protocol, ISO 14064, ISO 14065

  • SGS

    Inspection and certification group offering verification of GHG inventories to ISO 14064-1, at limited or reasonable assurance, with accredited and non-accredited options stated.

    Category: Assurance and verification

    Names: GHG Protocol, ISO 14064, ISO 14065, ISO 14067

  • South Pole

    Climate consultancy whose GHG accounting page describes inventory support (notably Scope 3), data-gap work and help with disclosure frameworks.

    Category: GHG accounting consulting

    Names: CDP, CSRD and ESRS, ISSB standards (IFRS S1 and S2), TCFD

  • Sphera

    Risk, safety and sustainability software provider whose offerings include GHG emissions management, Scope 3 tracking, sustainability reporting software and life-cycle-assessment data.

    Category: ESG and climate reporting platforms

    Names: CSRD and ESRS, Science Based Targets initiative (SBTi)

  • Sweep

    Platform for centralizing carbon and ESG data across a business and its value chain, with supplier data collection and multi-framework reporting templates.

    Category: Carbon accounting software

    Names: GHG Protocol, CDP, CSRD and ESRS, ISSB standards (IFRS S1 and S2), GRI Standards, SASB Standards, PCAF

  • Terrascope

    Software for measuring and reducing corporate and product carbon footprints, with AI-assisted data ingestion, gap filling and reporting.

    Category: Carbon accounting software

    Names: GHG Protocol, CDP, CSRD and ESRS, ISSB standards (IFRS S1 and S2), TCFD, GRI Standards, Science Based Targets initiative (SBTi)

  • Trinity Consultants

    Environmental consultancy offering GHG inventories across all three scopes, GHG and CDP reporting support, and staff for SB 253 emissions reporting questions.

    Category: GHG accounting consulting

    Names: GHG Protocol, CDP

  • TUV SUD

    Testing and certification group offering GHG verification of corporate carbon footprints (ISO 14064-1, GHG Protocol) and projects, with verification following ISO 14064-3.

    Category: Assurance and verification

    Names: GHG Protocol, ISO 14064, ISO 14065, ISO 14067

  • UL Solutions

    Testing and certification company offering GHG statement verification to ISO 14064-3 at limited or reasonable assurance for enterprise and product carbon footprints.

    Category: Assurance and verification

    Names: ISO 14064

  • Watershed

    Enterprise sustainability platform for measuring emissions, drafting sustainability reports and planning reductions, with AI-assisted data tools.

    Category: Carbon accounting software

    Names: CDP, CSRD and ESRS, ISSB standards (IFRS S1 and S2)

  • Wolters Kluwer Enablon

    Wolters Kluwer software for EHS, risk and ESG that includes a GHG management module for Scope 1-3 reporting and sustainability disclosure.

    Category: ESG and climate reporting platforms

    Names: CDP, GRI Standards

  • Workiva

    Reporting and disclosure platform whose sustainability offerings include Workiva Carbon for GHG accounting, plus ESG reporting, double materiality and data collection.

    Category: ESG and climate reporting platforms

    Names: GHG Protocol, CDP, CSRD and ESRS, ISSB standards (IFRS S1 and S2), GRI Standards

  • WSP

    Engineering and consulting firm whose US page lists GHG inventory management and inventory verification aligned with ISO 14064 and AA1000, plus disclosure support.

    Category: GHG accounting consulting

    Names: ISO 14064, CDP, TCFD, GRI Standards, SASB Standards, AA1000