SlashAuth alternatives
TL;DR: 12 companies doing similar work to SlashAuth in B2B, ranked by how closely they match what SlashAuth 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 SlashAuth. They are scored on how closely their own description overlaps with SlashAuth's, and all facts shown come from the YC company records — nothing is estimated.
What are the best alternatives to SlashAuth?
| Alternative | What it does | Batch | Team | Status |
|---|---|---|---|---|
| Fithub | — | Winter 2010 | — | Inactive |
| Insoshi | — | Winter 2008 | — | Inactive |
| Bryel | Devin for AI Research Engineering | Fall 2026 | 2 | Active |
| Mezmo | Observability platform to control all of your log data | Winter 2015 | 172 | Active |
| Activeloop | Database for AI | Summer 2018 | 15 | Active |
| Memorable | reducing agent reasoning into a graph search problem | Summer 2027 | 2 | Active |
| GrayPass | Verify that the expected person is in control before key actions. | Fall 2026 | 2 | Active |
| Amulet | High performance file system for agents | Summer 2026 | 2 | Active |
| Magma | Monetize your agent's traces. | Summer 2026 | 1 | Active |
| primitive | communication for agents | Spring 2026 | 4 | Active |
| Segment | Software and APIs to collect, clean, and control customer data. | Summer 2011 | 550 | Acquired |
| Proxino | Javascript proxy. | Summer 2011 | — | Inactive |
Is SlashAuth still active?
SlashAuth 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 SlashAuth. They are then ranked on how closely their own description overlaps with SlashAuth's, so the closest matches come first rather than whoever happens to share a tag.