# ESG and carbon reporting for small business buyers: what AI models recommend, September 2026

Gane Index, September 2026 Edition. Asked as "ESG reporting software" and as "carbon accounting platform", six framings each, to twelve models with search on, on behalf of a small B2B company. Page: https://www.gane.ai/index/finance/corporate/esg-and-carbon-reporting/2026-09/smb

This is the permanent record of the September 2026 Edition, published September 17, 2026 and superseded since. The current standing: https://www.gane.ai/index/finance/corporate/esg-and-carbon-reporting/smb/index.md

**Standing:** Greenly leads with 41% of first choices; verdict clear leader. 46 first choices across the direct, paraphrase, budget and scale prompts.

## First-choice share

| Rank | Product | Share | Negative rate | Labels |
|---|---|---|---|---|
| 1 | [Greenly](https://www.gane.ai/index/finance/vendors/greenly/index.md) | 41% | 4% | 47 |
| 2 | [ExecutESG](https://www.gane.ai/index/finance/vendors/executesg/index.md) | 13% | 0% | 12 |
| 3 | [Sustain.Life](https://www.gane.ai/index/finance/vendors/sustain-life/index.md) | 9% | 6% | 18 |
| 4 | [Persefoni](https://www.gane.ai/index/finance/vendors/persefoni/index.md) | 9% | 35% | 20 |
| 5 | Wardn | 7% | 0% | 19 |
| 6 | [Aclymate](https://www.gane.ai/index/finance/vendors/aclymate/index.md) | 4% | 0% | 11 |
| 15 | [Coolset](https://www.gane.ai/index/finance/vendors/coolset/index.md) | 0% | 14% | 14 |
| 18 | [Sweep](https://www.gane.ai/index/finance/vendors/sweep/index.md) | 0% | 27% | 15 |
| 79 | [Novisto](https://www.gane.ai/index/finance/vendors/novisto/index.md) | 0% | 60% | 10 |
| 83 | [Diligent ESG](https://www.gane.ai/index/finance/vendors/diligent-esg/index.md) | 0% | 80% | 10 |
| 85 | [Watershed](https://www.gane.ai/index/finance/vendors/watershed/index.md) | 0% | 82% | 11 |
| 87 | [IBM Envizi](https://www.gane.ai/index/finance/vendors/ibm-envizi/index.md) | 0% | 100% | 13 |

Rank is by share of first choices among all 88 products named; products with the same share are tied, and the order among them carries no meaning. The table lists those with at least 10 labels.

## Each model's first choice on the direct prompt

- Claude Haiku 4.5: Greenly; alternatives ESGenius!, today.green
- GPT-5.4 mini: KEY ESG, Tekmon; alternatives Precoro ESG
- Gemini 3.5 Flash: Greenly, Sustain.Life; alternatives Aclymate, Climate Essentials, Coolset, Seedling
- Perplexity Sonar: Greenly; alternatives Aclymate
- Grok 4.20: Code Gaia; alternatives Greenly, Wardn
- Mistral Small: Greenly, Wardn
- DeepSeek V4 Flash: Greenly; alternatives ExecutESG, GreenScore
- Llama 4 Maverick: no first choice
- Qwen 3.7 Flash: Greenly, Wardn; alternatives Normative, Persefoni
- Kimi K2: Greenly, Multiplye; alternatives Plan A, Sweep
- GLM 4.7 FlashX: Greenly; alternatives Emerald Power, Esgrid, ExecutESG, Greenomy
- MiniMax M2.5: Wardn; alternatives Greenly, Sustain.Life

## Sources the answers cite

66 of 72 answers came back with a source list, from 12 of 12 models. Sites named in the most answers:

- coolset.com: 32 answers, 38 citations
- gartner.com: 30 answers, 30 citations
- guideflow.com: 28 answers, 28 citations
- g2.com: 26 answers, 37 citations
- wardn.com: 25 answers, 42 citations
- onestopesg.com: 21 answers, 25 citations
- executesg.com: 20 answers, 38 citations
- climefy.com: 20 answers, 20 citations

Pages named in the most answers:

- https://coolset.com/academy/best-esg-reporting-software-tools (30 answers)
- https://gartner.com/reviews/market/esg-management-and-reporting-software (28 answers)
- https://guideflow.com/blog/esg-reporting-software (28 answers)
- https://climefy.com/blog/top-5-esg-compliance-software (20 answers)
- https://wardn.com/blog/best-esg-software-for-smbs (19 answers)
- https://g2.com/categories/environmental-social-and-governance-esg-reporting/small-business (18 answers)
- https://executesg.com/resources/blog/esg-software-pricing-2026 (16 answers)
- https://onestopesg.com/esg-resources/best-esg-reporting-software (15 answers)
- https://tracera.com/best-esg-software-platforms (13 answers)
- https://f6s.com/software/category/sme-esg-reporting (12 answers)

## Warned against

- Workiva ESG: 26 of 27 labels negative. "Avoid: Massive, blank-canvas enterprise tools (like Workiva or CCH Tagetik)... avoid large-enterprise solutions (like Workiva, Diligent, or Sphera)" (Gemini 3.5 Flash, scale prompt)
- IBM Envizi: 13 of 13 labels negative. "G2 reviewers consistently cite high cost and a difficult setup process as major barriers for smaller organizations." (DeepSeek V4 Flash, negative prompt)
- Diligent ESG: 8 of 10 labels negative. "Enterprise tools (Workiva, Diligent, Envizi, Watershed) run $30k–$400k/yr — completely out of your league." (DeepSeek V4 Flash, scale prompt)
- SpheraCloud Corporate Sustainability: 8 of 8 labels negative. "Why to avoid: Sphera explicitly targets organizations with 5,000+ employees ... making it a poor fit for a small business" (GLM 4.7 FlashX, negative prompt)

## Record

- Method: https://www.gane.ai/index/finance/methodology
- License: CC BY 4.0. Cite as Gane Index, September 2026 Edition, www.gane.ai/index/finance.