As regulatory pressure builds and corporate climate targets become more ambitious, Australian businesses are increasingly turning to carbon accounting software to streamline emissions measurement, reporting, and reduction. But with so many platforms now available, ranging from fully automated Scope 3 systems to disclosure tools aimed at investors, choosing the right one can get complicated, fast.
This guide cuts through the noise. We’ve reviewed nine software platforms either based in Australia or actively serving the local market, looking at how each handles emissions data, reporting standards, and real-world usability.
Why choose an Australian carbon accounting platform?
Choosing an Australian carbon accounting platform gives your business a practical edge. Local providers are more likely to understand the specific reporting requirements of the Australian Sustainability Reporting Standards (ASRS), evolving regulatory expectations, and the realities of operating in the Australian market, from emissions factors to procurement data. Working with a local team also means faster support, better alignment with your financial year, and a deeper understanding of Australian industries and supply chains. If you're aiming for credible, audit-ready reporting, choosing a platform built for this region just makes sense.
1. Avarni
Avarni is an award-winning Australian carbon accounting software company, founded in 2021 by former Atlassian and Macquarie Telecom Group staff Misha Cajic and Anuj Paudel, and backed by Main Sequence Ventures, a VC firm co-founded by CSIRO. Purpose-built for CFOs and finance teams in Australia who are getting up to speed with sustainability reporting, Avarni is the leading solution for organisations implementing carbon accounting, especially Scope 3 emissions.
Automation and compliance at scale
Avarni uses machine learning to automate emissions mapping, invoice data extraction, and emissions factors application, reducing manual work and errors. The platform can process millions of rows of data, apply consistent calculation rules, and generate audit-ready reports aligned with the GHG Protocol, ASRS, and ISSB.
Scope 3 and supplier engagement
Avarni combines advanced Scope 3 analysis with a supplier engagement tool that enables companies to collect activity-based data directly from suppliers. Remaining gaps are filled with spend-based estimates and regional factors, making Scope 3 reporting more credible and verifiable. The platform also includes forecasting tools to model emissions pathways and test reduction scenarios.
Ongoing support
Every Avarni customer is paired with a dedicated implementation team to ensure successful onboarding, data quality, and compliance outcomes. For those requiring additional expertise, Avarni partners with firms such as BDO Australia, Jacobs, NTT Data, and Schneider Electric to extend support into broader ESG strategy.
2. Clear Carbon
Clear Carbon is an Australian platform that combines carbon accounting software with advisory services. It supports GHG Protocol alignment and helps businesses build emissions inventories that align with current reporting requirements. The platform may suit organisations that prefer a guided implementation approach, particularly where internal sustainability resources are limited.
3. Climate Zero
Climate Zero is designed for small to medium-sized businesses starting out with carbon accounting. It supports Scopes 1, 2, and 3 and includes features for forecasting and emissions planning. With a focus on accessibility and ease of use, the platform aims to make carbon reporting more manageable for teams without dedicated sustainability resources.
4. Greenbase
Greenbase has a long-standing presence in Australia’s carbon reporting space, particularly within sectors like mining, energy, and utilities. The platform supports detailed emissions calculation and compliance reporting, including NGER. It may be most relevant for organisations with complex regulatory obligations and established environmental reporting processes.
5. NetNada
NetNada offers a streamlined carbon accounting tool for small and medium-sized businesses. It supports both activity-based and spend-based methods and includes built-in climate action planning. The platform is designed for ease of use and quick implementation, with a focus on helping businesses get started with emissions measurement and reduction.
6. Pathzero
Pathzero now focuses on the financial sector, providing a disclosure and emissions risk platform for private equity firms and institutional investors. It enables users to assess emissions exposure across investment portfolios using data shared by portfolio companies. While no longer positioned as a general-purpose carbon accounting tool, it plays a growing role in financed emissions transparency and investor reporting.
7. Sumday
Sumday is a carbon accounting platform built for accountants, advisors, and finance teams supporting clients through emissions reporting. It integrates with financial workflows and helps facilitate the collection of Scope 3 data from suppliers. Sumday is particularly relevant for firms providing climate reporting services, rather than large enterprises looking to manage emissions directly within their own operations.
8. Trace
Trace offers a carbon accounting and offsetting platform tailored for SMEs, with a strong emphasis on climate storytelling and customer-facing dashboards. It provides baseline emissions estimates and supports progress reporting against broad frameworks. The platform is designed for businesses focused on brand-led climate action, rather than operational emissions management or supply chain analysis.
9. Workiva Carbon
Workiva Carbon is part of the broader Workiva reporting platform, combining carbon measurement with financial and ESG disclosures. While not developed specifically for the Australian market, it supports international frameworks such as the GHG Protocol and ISSB, and is used by organisations operating across multiple regions and jurisdictions.
