Agent 37 alternatives
TL;DR: 12 companies doing similar work to Agent 37 in B2B, ranked by how closely they match what Agent 37 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 Agent 37. They are scored on how closely their own description overlaps with Agent 37's, and all facts shown come from the YC company records — nothing is estimated.
What are the best alternatives to Agent 37?
| Alternative | What it does | Batch | Team | Status |
|---|---|---|---|---|
| Fithub | — | Winter 2010 | — | Inactive |
| Insoshi | — | Winter 2008 | — | Inactive |
| primitive | communication for agents | Spring 2026 | 4 | Active |
| Bryel | Devin for AI Research Engineering | Fall 2026 | 2 | Active |
| Ardent | Database sandboxes for Agents | Spring 2026 | 3 | Active |
| Terse | Durable state for AI agents | Fall 2026 | 2 | Active |
| Memory Store | Company Brain. | Spring 2026 | 4 | Active |
| Magma | Monetize your agent's traces. | Summer 2026 | 1 | Active |
| Indexable | sandbox infrastructure for AI agents | Spring 2026 | 3 | Active |
| Inkbox | The identity and communication layer for AI agents | Summer 2026 | 3 | Active |
| PhoneSys | The Phone System for Sales Teams. | Summer 2011 | 4 | Inactive |
| Parasma | Replacing GPUs with human brain cells | Summer 2026 | 2 | Active |
Is Agent 37 still active?
Agent 37 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 Agent 37. They are then ranked on how closely their own description overlaps with Agent 37's, so the closest matches come first rather than whoever happens to share a tag.