Best Free Sustainability & ESG Tools in 2026

Persefoni is a comprehensive carbon accounting and sustainability management platform designed to help businesses of all sizes and complexities measure, report, and decarbonize their greenhouse gas (GHG) emissions. It provides assurance-grade reporting for major climate disclosure regulations and supports net-zero target setting, reduction modeling, and supplier engagement. The platform leverages PersefoniAI, which includes features like Copilot for technical carbon accounting expertise, anomaly detection for large datasets, and natural language-based emission factor mapping. Persefoni also offers specialized solutions for financial services companies to measure financed emissions and provides expert support for navigating complex regulatory requirements like California's SB 253 and SB 261, offering both software tools and managed services for compliance.

Sylvera Carbon offers a comprehensive platform for assessing, analyzing, and navigating the carbon credit and commodity markets. It provides geospatial analytics, independent ratings of carbon credit quality, market intelligence, and carbon intensity assessments. The platform is designed for a wide range of global market participants, including project developers, buyers, investors, and governments, enabling them to make informed decisions with confidence. The product helps users understand how carbon projects are assessed and priced, identify early-stage project risks, and track market and pricing signals. It supports the full lifecycle of carbon and commodity market participation, from early development to long-term value creation, by providing transparent, science-led data and tools to optimize climate impact and investment returns.

Carbon Analytics is a comprehensive platform designed to help businesses understand and manage their environmental impact by accurately measuring carbon emissions. It provides tools for collecting data, calculating emissions across various scopes, and generating detailed reports to meet compliance and sustainability goals. The platform simplifies the complex process of carbon accounting, enabling organizations to identify emission hotspots, set reduction targets, and monitor progress over time. This tool is ideal for businesses of all sizes looking to improve their environmental performance, comply with regulations, and demonstrate their commitment to sustainability to stakeholders. It supports data input from diverse sources, offers customizable reporting, and provides insights to inform strategic decisions for a greener operation. By centralizing carbon data, Carbon Analytics empowers companies to take actionable steps towards reducing their carbon footprint.

EcoRatings is an AI-powered platform that utilizes Generative AI and blockchain technology to provide comprehensive and verifiable sustainability ratings for products and services. It aims to address the challenges of greenwashing and lack of transparency in environmental, social, and governance (ESG) claims by offering a robust system for data collection, analysis, and immutable record-keeping. The platform is designed for businesses seeking to accurately measure, report, and improve their sustainability performance, as well as for consumers and investors who require trustworthy information to make informed decisions. By integrating AI for data processing and blockchain for secure, transparent validation, EcoRatings helps organizations build trust and demonstrate genuine commitment to sustainability, fostering a more sustainable global economy.

LumiWatts is a ClimateTech solution designed to help households reduce their CO2 emissions and save on utility costs. It achieves this by providing personalized energy insights, analyzing utility bills and appliance data to identify energy waste. The platform translates complex energy information into simple, visual recommendations, empowering users to make informed decisions about their energy consumption. This tool is for homeowners who want to actively contribute to combating climate change while also lowering their household expenses. By understanding exactly where energy is being used, from individual appliances to entire rooms, users can implement targeted changes to reduce waste, extend appliance longevity, and make their home more sustainable.

Measurabl is a comprehensive ESG (Environmental, Social, and Governance) platform specifically designed for the real estate industry. It enables owners, operators, investors, and lenders to centralize, manage, and analyze sustainability data across their portfolios. The platform transforms subjective sustainability data into objective, actionable insights, helping users track performance, benchmark progress, and comply with evolving regulations. Measurabl leverages its Quantum Cloud, an authoritative repository of aggregated real estate data, to provide accurate and investment-grade information. It supports various aspects of sustainability management, from automated utility data collection and carbon emissions calculation to physical climate risk assessment and effortless reporting to global frameworks like GRESB, CDP, and SFDR. The platform aims to drive better decision-making, accelerate progress towards net-zero goals, and improve net operating income (NOI) through real-time building insights.