Sigma alternatives
TL;DR: 12 companies doing similar work to Sigma in B2B, ranked by how closely they match what Sigma actually does — not just by category.
How this list was built: every company here is Y Combinator-backed and shares at least one category with Sigma. They are scored on how closely their own description overlaps with Sigma's, and all facts shown come from the YC company records — nothing is estimated.
What are the best alternatives to Sigma?
| Alternative | What it does | Batch | Team | Status |
|---|---|---|---|---|
| Rex | AI-native BPO for enterprise order-to-cash | Summer 2026 | 2 | Active |
| Scanate/Fellow | API for Invoice Financing | Summer 2016 | 2 | Inactive |
| Q2Q | We help private equity teams find acquisition targets faster | Winter 2026 | 2 | Inactive |
| Fithub | — | Winter 2010 | — | Inactive |
| Insoshi | — | Winter 2008 | — | Inactive |
| Definite | Build everyday back-office agents on one live model of your books | Fall 2026 | 3 | Active |
| Sintropix | Autonomous accounting platform for global companies | Fall 2026 | 2 | Active |
| Deel | The all-in-one HR and payroll platform for global teams | Winter 2019 | 5000 | Active |
| Simetrik | No code enterprise SaaS for financial control automation. | Winter 2018 | 350 | Active |
| Bonfire | Bonfire is reimagining RFPs & bidding for gov procurement teams | Winter 2015 | 95 | Acquired |
| CaptivateIQ | Agile commission software to design, deploy & adapt commission plans. | Winter 2018 | 280 | Active |
| Rocketrip | Rocketrip helps companies save money on travel expenses by aligning… | Winter 2014 | 68 | Acquired |
Is Sigma still active?
Sigma is still operating, so switching is a choice rather than a forced migration. Compare on fit and price rather than urgency.
How was this list put together?
Every company here is Y Combinator-backed and shares at least one category with Sigma. They are then ranked on how closely their own description overlaps with Sigma's, so the closest matches come first rather than whoever happens to share a tag.