# Best Carbon Accounting Software - Page 6

*By [Lauren Worth](https://research.g2.com/insights/author/lauren-worth)*


Carbon accounting software helps companies track carbon emissions and implement programs to reduce them through decarbonization. Businesses use this software to improve their environmental protection initiatives and demonstrate their efficiency to interested parties like investors, partners, government agencies, NGOs, and the public.

This type of software is used mainly by industries that produce high emissions, such as manufacturing, oil and gas, mining, transportation, and utilities. Carbon accounting software can also be used by IT companies since hardware, such as servers, produce CO2 emissions. While carbon accounting features may be found in [sustainability management software](https://www.g2.com/categories/sustainability-management) and [environmental, social, and governance (ESG) reporting software](https://www.g2.com/categories/environmental-social-and-governance-esg-reporting), many vendors provide standalone software that offer advanced features such as decarbonization.

To qualify for inclusion in the Carbon Accounting category, a product must:

- Provide features for monitoring carbon emissions from multiple sources
- Create emissions reports that are compliant with carbon regulations
- Allow users to create and analyze emissions scenarios and forecasts
- Deliver decarbonization plans to help companies reduce carbon emissions
- Provide access to marketplaces to buy and sell carbon credits
- Include metrics and analytics specific to carbon accounting






## G2 Grid® for Carbon Accounting Software
![G2 Grid® for Carbon Accounting Software plotting products by satisfaction and market presence](https://www.g2.com/categories/carbon-accounting/grids.png?focus%5B%5D=1301114&focus%5B%5D=1323049&focus%5B%5D=20026&focus%5B%5D=1868342&focus%5B%5D=143528&focus%5B%5D=169047&focus%5B%5D=1240642&focus%5B%5D=1318221)
Highlighted products: osapiens, Watershed, Workiva, Orki, Greenly, Trace, carbmee EIS, and Google Carbon Footprint.
Underlying data: [Grid® JSON](https://www.g2.com/categories/carbon-accounting/grids.json?focus%5B%5D=osapiens&focus%5B%5D=watershed&focus%5B%5D=workiva-workiva&focus%5B%5D=orki&focus%5B%5D=greenly&focus%5B%5D=trace-2025-03-07&focus%5B%5D=carbmee-eis&focus%5B%5D=google-carbon-footprint)


## How Many Carbon Accounting Software Products Does G2 Track?
**Total Products under this Category:** 134

### Category Stats (Jul 2026)
- **Average Rating**: 4.64/5 The average rating of products in this category, based on all submitted ratings
- **Top Trending Product**: Ecologi (+6.36%) - Among all products in this category, Ecologi recorded the largest rating increase compared to last month
*Last updated: July 22, 2026*


## How Does G2 Rank Carbon Accounting Software Products?

**Why You Can Trust G2's Software Rankings:**

- 30 Analysts and Data Experts
- 3,100+ Authentic Reviews
- 134+ Products
- Unbiased Rankings

G2's software rankings are built on verified user reviews, rigorous moderation, and a consistent research methodology maintained by a team of analysts and data experts. Each product is measured using the same transparent criteria, with no paid placement or vendor influence. While reviews reflect real user experiences, which can be subjective, they offer valuable insight into how software performs in the hands of professionals. Together, these inputs power the G2 Score, a standardized way to compare tools within every category.


---

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---

## What Are the Top-Rated Carbon Accounting Software Products in 2026?
### 1. [Sphera Environmental Accounting](https://www.g2.com/products/sphera-environmental-accounting/reviews)
SpheraCloud Environmental Accounting is a comprehensive software solution designed to help organizations manage and report their environmental data effectively. Tailored for industries with significant environmental footprints, it simplifies the complexities of emissions calculations and ensures compliance with environmental regulations. By providing a transparent and auditable system, the software enables companies to track and calculate their carbon footprint and other emissions with ease. Key Features and Functionality: - Data Collection and Management: Automates the gathering of environmental data, reducing manual errors and enhancing efficiency. - Emissions Calculation: Utilizes advanced algorithms to accurately compute emissions across various categories, including air, water, and waste. - Regulatory Compliance: Keeps organizations aligned with evolving environmental regulations by providing up-to-date reporting tools. - Real-Time Reporting: Offers dynamic dashboards and reports, enabling stakeholders to monitor environmental performance continuously. - Integration Capabilities: Seamlessly integrates with existing systems, facilitating a unified approach to environmental data management. Primary Value and Problem Solved: SpheraCloud Environmental Accounting addresses the challenges organizations face in managing vast amounts of environmental data and adhering to stringent regulations. By automating data collection and analysis, it minimizes the risk of non-compliance and associated penalties. The software's transparency and traceability build trust among stakeholders, while its real-time insights empower companies to make informed decisions, optimize asset performance, and advance their sustainability goals.



**Who Is the Company Behind Sphera Environmental Accounting?**

- **Seller:** [Sphera](https://www.g2.com/sellers/sphera)
- **Year Founded:** 2016
- **HQ Location:** Chicago, IL
- **Twitter:** @SpheraSolutions (4,011 Twitter followers)
- **LinkedIn® Page:** https://www.linkedin.com/company/sphera/ (1,449 employees on LinkedIn®)






### 2. [Sumday](https://www.g2.com/products/sumday/reviews)
Market leading GHG accounting training, software and support for your company and every single business in your supply chain.



**Who Is the Company Behind Sumday?**

- **Seller:** [Sumday](https://www.g2.com/sellers/sumday)
- **Year Founded:** 2023
- **HQ Location:** Burnie, AU
- **Twitter:** @sumday_io (10 Twitter followers)
- **LinkedIn® Page:** https://www.linkedin.com/company/sumday-io (23 employees on LinkedIn®)






### 3. [Sylvera](https://www.g2.com/products/sylvera/reviews)
Sylvera is a carbon intelligence platform that delivers comprehensive and accessible carbon ratings and insights.



**Who Is the Company Behind Sylvera?**

- **Seller:** [sylvera](https://www.g2.com/sellers/sylvera)
- **Year Founded:** 2020
- **HQ Location:** London, GB
- **LinkedIn® Page:** https://www.linkedin.com/company/sylveracarbon (154 employees on LinkedIn®)






### 4. [Tanso](https://www.g2.com/products/tanso-technologies-gmbh-tanso/reviews)
Tanso is the ESG and carbon accounting software that industrial companies in DACH rely on to stay competitive and compliant. The Tanso platform enables companies to meet customer requests and regulatory requirements in sustainability, ensuring data management to the highest standards through structured, audit-proof processes. Built specifically for producing companies, Tanso combines deep industrial carbon expertise with flexible data architecture that integrates seamlessly into the existing IT landscape. The platform supports major regulatory frameworks including CSRD, EU Taxonomy, VSME, ISO 14064, EcoVadis, and SAQ 5.0, and features TÜV Rheinland-certified carbon accounting methodology. Developed and hosted in Germany, Tanso is trusted by over 300 industrial customers in carbon-intensive sectors such as automotive, mechanical engineering, food and chemicals to strengthen their competitive position in sustainability and ESG performance.


**Average Rating:** 5.0/5.0
**Total Reviews:** 1

**Who Is the Company Behind Tanso?**

- **Seller:** [Tanso Technologies](https://www.g2.com/sellers/tanso-technologies)
- **Year Founded:** 2021
- **HQ Location:** Munich, DE
- **LinkedIn® Page:** https://www.linkedin.com/company/tansotechnologies/ (71 employees on LinkedIn®)

**Who Uses This Product?**
- **Company Size:** 100% Enterprise



#### What Are Recent G2 Reviews of Tanso?

**"[Simple, flexible, and supportive - Tanso is unbeatable](https://www.g2.com/survey_responses/tanso-review-12750901)"**

**Rating:** 5.0/5.0 stars
*— Marcus S.*

[Read full review](https://www.g2.com/survey_responses/tanso-review-12750901)

---



### 5. [Terrave](https://www.g2.com/products/terrave/reviews)
Terrave is an AI-powered platform that generates Environmental Product Declarations (EPDs) for building product manufacturers and performs whole-building lifecycle assessment (LCA) for architects — in minutes instead of months. Manufacturers upload their bill of materials. Terrave's AI matches every ingredient to verified LCA data from ecoinvent, calculates all environmental impact categories, and generates a verification-ready EPD with full background report. Architects upload a material schedule. Terrave matches every material against 70,000+ published EPDs in TerraBase, calculates total building embodied carbon, and generates LEED-ready documentation. Built for Buy Clean compliance. ISO 14025, EN 15804+A2, and ISO 21930 conformant.



**Who Is the Company Behind Terrave?**

- **Seller:** [Terrave](https://www.g2.com/sellers/terrave)
- **HQ Location:** N/A
- **LinkedIn® Page:** https://www.linkedin.com/company/terrave/ (2 employees on LinkedIn®)






### 6. [Thrust Calculator](https://www.g2.com/products/thrust-calculator/reviews)
Thrust Calculator gives you accurate CO2 measurements & analysis for all of your business travel.



**Who Is the Company Behind Thrust Calculator?**

- **Seller:** [Thrust Carbon](https://www.g2.com/sellers/thrust-carbon)
- **Year Founded:** 2019
- **HQ Location:** London, GB
- **LinkedIn® Page:** https://www.linkedin.com/company/thrustcarbon (34 employees on LinkedIn®)






### 7. [Unravel Carbon](https://www.g2.com/products/unravel-carbon/reviews)
Unravel Carbon is the climate platform helping companies with global supply chains make data-driven decisions. Our platform provides enterprises with reliable insights into their emissions, enabling them to measure, reduce, and report with confidence. We are trusted by companies across key sectors, including manufacturing, fashion, consumer goods, food and beverage, and financial services.



**Who Is the Company Behind Unravel Carbon?**

- **Seller:** [Unravel Carbon](https://www.g2.com/sellers/unravel-carbon)
- **Year Founded:** 2021
- **HQ Location:** Singapore, SG
- **LinkedIn® Page:** https://www.linkedin.com/company/unravelcarbon (36 employees on LinkedIn®)






### 8. [Virtual Sustainability Officer®](https://www.g2.com/products/virtual-sustainability-officer/reviews)
The Virtual Sustainability Officer® is an all-in-one net zero solution and climate technology platform. Its primary purpose is to help businesses measure, monitor, report, and reduce their carbon emissions and manage their environmental, social, and governance (ESG) strategies. The platform enables organisations to achieve their net zero carbon objectives with efficiency and precision.



**Who Is the Company Behind Virtual Sustainability Officer®?**

- **Seller:** [Alectro](https://www.g2.com/sellers/alectro)
- **HQ Location:** London, GB
- **LinkedIn® Page:** https://www.linkedin.com/company/alectro-io/ (18 employees on LinkedIn®)
- **Ownership:** Private






### 9. [Vizcab](https://www.g2.com/products/vizcab/reviews)
Vizcab's mission is to help construction players manage the carbon emissions of their projects by securing the achievement of RE2020 thresholds from the sketch stage with Explo, and by making the most of your regulatory LCAs with Eval.



**Who Is the Company Behind Vizcab?**

- **Seller:** [Vizcab](https://www.g2.com/sellers/vizcab)
- **HQ Location:** Lyon, FR
- **LinkedIn® Page:** https://www.linkedin.com/company/vizcab/ (52 employees on LinkedIn®)







## What Is Carbon Accounting Software?

[Governance, Risk & Compliance Software](https://www.g2.com/categories/governance-risk-compliance)

## What Software Categories Are Similar to Carbon Accounting Software?

- [Sustainability Management Software](https://www.g2.com/categories/sustainability-management)
- [Environmental, Social, and Governance (ESG) Reporting Software](https://www.g2.com/categories/environmental-social-and-governance-esg-reporting)