Captain alternatives
TL;DR: 12 companies doing similar work to Captain in B2B, ranked by how closely they match what Captain 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 Captain. They are scored on how closely their own description overlaps with Captain's, and all facts shown come from the YC company records — nothing is estimated.
What are the best alternatives to Captain?
| Alternative | What it does | Batch | Team | Status |
|---|---|---|---|---|
| Fithub | — | Winter 2010 | — | Inactive |
| Insoshi | — | Winter 2008 | — | Inactive |
| primitive | communication for agents | Spring 2026 | 4 | Active |
| Dialogus | voice AI agents that learn how your company actually works | Summer 2026 | 3 | Active |
| Magma | Monetize your agent's traces. | Summer 2026 | 1 | Active |
| Indexable | sandbox infrastructure for AI agents | Spring 2026 | 3 | Active |
| Sherpa Labs | Frontier Data | Winter 2025 | 5 | Active |
| Memorable | reducing agent reasoning into a graph search problem | Summer 2027 | 2 | Active |
| Compose | We make it easy to run databases. PostgreSQL, Redis, MongoDB,… | Summer 2011 | 51 | Acquired |
| Ardent | Database sandboxes for Agents | Spring 2026 | 3 | Active |
| Context.dev | Web data API for agents | Summer 2026 | 6 | Active |
| Terse | Durable state for AI agents | Fall 2026 | 2 | Active |
Is Captain still active?
Captain 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 Captain. They are then ranked on how closely their own description overlaps with Captain's, so the closest matches come first rather than whoever happens to share a tag.