5 features your emissions tracking software must have

Emissions tracking software helps a business measure, report and reduce its carbon footprint on one platform. When you compare carbon emission software, five features matter most: fast data import, a clear ranking of emission hotspots, support for the US rules you report under, supplier data collection for Scope 3 and built-in reduction planning. Each section explains what to look for and ends with a test you can run in a vendor demo on your own data. The timing matters for many US companies: first Scope 1 and 2 reports under California’s SB 253 are due on November 10, 2026, according to CARB’s 2026 reporting guidance, so traceable data is now a purchasing criterion.

It rests on greenhouse gas accounting: each figure is an activity multiplied by an emission factor and sorted into Scope 1, 2 or 3. Scope 1 covers direct emissions from sources a company owns or controls, Scope 2 covers the energy it buys, and Scope 3 covers all other indirect emissions across its value chain. Some vendors sell the same job as carbon tracking software, carbon footprint tracking software or emissions management software, and it sits at the heart of carbon accounting.

For US companies, the rules are moving in different directions. California’s SB 253 is in force, SB 261 is paused by a court order, and the SEC’s 2024 climate rules never took effect and are proposed for rescission. Whichever rule applies to you, the data behind it needs a clear audit trail.

Quickly, and with errors flagged along the way. For most companies, collecting and organizing the data is the first and hardest step, so import speed and accuracy shape everything that follows. Look for a tool that takes your accounting files, utility data and supplier records directly, and connects to the systems you already use, such as your accounting package or ERP.

Speed only helps if the method behind each number is clear. The GHG Protocol’s Scope 3 calculation guidance lists four ways to calculate emissions from purchased goods and services: supplier-specific, hybrid, average-data and spend-based. Spend-based estimates emissions from the economic value of purchases and is the fallback when better data is not available. The tool should support several methods and flag data quality.

For US inventories, the US EPA publishes default factors for organizational reporting in its Emission Factors Hub; the 2025 edition (January 2025) is the latest listed on EPA’s page. Your software should show which factor it applied to each line.

To test this feature, ask the vendor to import a sample of your own ledger and utility data live, and show how errors are flagged.

Once your data is in, the next test is whether the tool ranks your largest sources. Hotspot analysis sorts emissions by activity, supplier and site, so you can see where a reduction will count most.

Why does hotspot analysis matter?

Hotspots vary with industry, scale and business model. A manufacturer may find that production processes dominate, while a service firm may find that employee commuting and business travel make up a large share. Knowing which applies lets you direct budget and effort to the sources that cut the most emissions.

Check that results can be split by scope, category and site, and that you can drill down to the underlying records.

To test this, ask for a breakdown by scope and category that ranks your top sources.

Here the test is output: the tool should produce what each rule requires and show how every figure was calculated. Three rules matter most to a US company, and their status keeps shifting.

SB 253 and SB 261 sit within California’s climate disclosure laws, which differ in who must report and when.

For finance teams preparing for SB 253, four questions show whether a tool is ready:

• Can it produce a Scope 1 and 2 inventory for the reporting year?
• Can every figure be traced to its source document for an auditor?
• Can it export the inventory in the format CARB accepts?
• Can it add Scope 3 categories when CARB finalizes its 2027 requirements?

To test this feature, trace one reported figure back to its source document.

It should: the value chain is often where the largest share of a company’s emissions sits. In a June 2024 CDP and BCG analysis, companies disclosing to CDP reported supply chain emissions 26 times their operational emissions on average for 2023, yet only 15% had set a supply chain emissions target.

Under SB 253, Scope 3 reporting is scheduled to begin in 2027, and CARB is still developing the details, so a tool should be able to add supplier data and new categories without a rebuild. Supplier data also replaces spend-based estimates with figures specific to each source of Scope 3 emissions.

A supplier workflow should cover invitation, questionnaire, validation and an audit trail. Supplier figures vary in scope and quality, so look for a tool that checks responses and flags outliers before they enter your Scope 3 total.

To test this, send a test questionnaire to one supplier and see how responses are validated.

The fifth feature is what turns a measurement into a plan. Look for target setting, reduction scenarios, action assignment and progress tracking in the same platform as your footprint.

A reduction plan is specific to each company: it has to fit your emission sources, operations and objectives, and it should let you adjust as the business evolves. Plans also need owners inside the business and among key suppliers, so the tool should let you assign actions and track who delivers them.

To test this, model one reduction action and see how it changes your target trajectory.

Use the five features as a checklist for any platform, including Greenly’s, and add four questions for every vendor:

• How much manual work does data entry actually require? Ask which systems connect directly and what still needs a manual upload.
• Does it cover Scope 3 as well as Scope 1 and 2? A tool that stops at direct emissions leaves the largest share of a footprint unmeasured, and SB 253 Scope 3 reporting is scheduled for 2027.
• Which frameworks does it map to? GHG Protocol coverage is table stakes; check whether it handles the rules you report under, such as California’s SB 253, and CSRD if you have EU operations.
• What happens after the measurement? A platform that stops at a number leaves you to build the reduction plan yourself.

Use the table below to request proof for each feature during a demo.

What is the best software for tracking carbon emissions?

The best software for tracking carbon emissions is the one that passes all five tests above on your own data. Rankings help you build a shortlist, and the guide to top carbon management software compares platforms for US businesses. Make the final choice in live demos: import your files, check the hotspot breakdown, trace a figure to source, test a supplier questionnaire and model a reduction action.

Greenly is the carbon accounting and climate management platform that helps companies measure, reduce and report their emissions with AI. Four features address the problems above:

• Manual data entry. Accounting, Excel and CSV files go straight in, physical flow data is added, and APIs connect more than 100 systems, including ERP and accounting tools.
• Choosing the right factor. Each entry is matched against more than 300,000 traceable emission factors, so you can show which factor sits behind a figure.
• Supplier data. Suppliers receive a questionnaire and are scored on more than 40 criteria with a grade from A to E, and every data entry is logged for auditor review.
• Plans that follow the footprint. Targets, reduction plans and progress tracking live in the same platform as the data.

More than 3,500 companies use Greenly for their carbon accounting. Book a free demo to run your own files through Greenly’s carbon footprint platform and see the audit trail for yourself.