British SMEs have officially hit the “Compliance Wall.” With the UK Sustainability Reporting Standards (SRS) now in full effect for the 2026 reporting cycle, the era of “optional” ESG is over.
If your business sits within the supply chain of a FTSE 100 firm or a Tier-1 bank, you are now required to provide granular, audit-ready data or risk being off-boarded.
Two platforms have emerged as the primary “SaaS Glue” for the UK market: Greenly and Coolset. While both SRS compliance software platforms promise automation, they solve very different problems.
This guide breaks down which engine belongs in your stack when it comes to SDR reporting tools.
Greenly – The “High-Velocity” Carbon Specialist
Greenly has carved out a niche as the fastest “on-ramp” for businesses that need a carbon footprint yesterday. Their platform is built on a “monetary-to-carbon” methodology, which is a game-changer for micro-SMEs and high-growth tech firms.
Key Feature: Financial Data Integration
Greenly’s strongest selling point is its ability to sync directly with UK accounting giants like Xero, Sage, and QuickBooks. By analysing your ledger and utility bills, it estimates your Scope 1, 2, and 3 emissions with minimal manual entry.
2026 Verdict for Greenly:
- Best for: Professional services, tech startups, and small retailers.
- The “Win”: It gets you a “Baseline” report in days, allowing you to tick the “ESG compliant” box for your 2026 tenders immediately.
- The Limitation: It is heavily carbon-focused. If your buyer is asking for deep “S” (Social) or “G” (Governance) metrics under the broader SRS S1 requirements, Greenly can feel a bit thin.
Coolset – The Supply Chain Powerhouse
If Greenly is a sprinter, Coolset is an endurance athlete built for the manufacturing and logistics sectors. As we move into 2026, the FCA has made it clear that “estimated” Scope 3 data is no longer enough for mid-market firms. You need real data from your real suppliers. This is where Coolset dominates.
Key Feature: The Supplier Engagement Portal
Coolset doesn’t just estimate what your suppliers are doing; it helps you ask them. It provides a dedicated portal where your vendors can upload their own data, which is then rolled up into your company-wide dashboard. This creates the “Immutable Audit Trail” that 2026 auditors are looking for.
2026 Verdict for Coolset:
- Best for: Manufacturers, construction firms, and wholesalers.
- The “Win”: It solves the “Scope 3 Headache” by automating the data collection process from your supply chain.
- The Limitation: The setup is more intensive than Greenly. You’ll need a dedicated staff member to manage the vendor invitations and data verification.
Direct Comparison: 2026 Feature Set
| Feature | Greenly | Coolset |
| Onboarding Speed | 48–72 Hours | 2–4 Weeks |
| Data Source | Bank Feeds & Invoices | Primary Vendor Data |
| SRS Compatibility | High (Climate/S2 focus) | High (Full Supply Chain focus) |
| UK Audit Ready? | Yes (Estimated Baseline) | Yes (Verified Audit Trail) |
| Primary Pricing | Low/Entry-level | Mid-market/Value-based |
Final Consultant Recommendation: Which should you choose?
Choose Greenly if:
You are a service-based business under £10M turnover and your primary goal is to satisfy a “Carbon Neutral” or “Scope 1 & 2” requirement for a new contract. It is the most cost-effective way to get “SRS Ready” without hiring a consultant.
Choose Coolset if:
You are a manufacturing or physical-goods business with a complex supply chain. If your Tier-1 buyers are demanding “primary data” rather than “estimates,” Coolset is the only tool in this price bracket that provides a defensible audit trail for 2026.
Taking the First Step
The worst thing a UK director can do in 2026 is stay in a spreadsheet. Whether you choose the speed of Greenly or the depth of Coolset, the transition to automated compliance must happen this quarter.
Not sure where you sit? Complete our 2026 Compliance Scorecard to see if your current data methods pass the 2026 audit test.