Atrium alternatives
TL;DR: 12 companies doing similar work to Atrium in B2B, ranked by how closely they match what Atrium 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 Atrium. They are scored on how closely their own description overlaps with Atrium's, and all facts shown come from the YC company records — nothing is estimated.
What are the best alternatives to Atrium?
| Alternative | What it does | Batch | Team | Status |
|---|---|---|---|---|
| Insoshi | — | Winter 2008 | — | Inactive |
| Regbase | Automating Corporate Compliance, Worldwide | Spring 2026 | 3 | Active |
| Fithub | — | Winter 2010 | — | Inactive |
| SimpleLegal | Legal Operations for corporate legal teams. | Summer 2013 | 60 | Acquired |
| Relaw | AI Legal OS | Fall 2025 | 2 | Active |
| Interstate | Create & Share Product Roadmaps | Summer 2011 | 2 | Inactive |
| Cembla | AI for legal & government | Summer 2023 | 2 | Active |
| Caseflood.ai | How elite law firms do intake | Winter 2025 | 2 | Active |
| OpenIntake | The AI Front Door For Law Firms | Winter 2025 | 2 | Active |
| Spire Law | Tech enabled business and employment litigation law firm. | Winter 2019 | 10 | Active |
| Pollen | AI employees trained on your firm's workflows. | Winter 2026 | 3 | Active |
| General Legal | Elite AI law firm for high growth companies | Winter 2026 | 40 | Active |
Is Atrium still active?
Atrium is no longer listed as active, so anyone still relying on it should plan a migration to one of the alternatives above.
How was this list put together?
Every company here is Y Combinator-backed and shares at least one category with Atrium. They are then ranked on how closely their own description overlaps with Atrium's, so the closest matches come first rather than whoever happens to share a tag.