Ossus alternatives
TL;DR: 12 companies doing similar work to Ossus in B2B, ranked by how closely they match what Ossus 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 Ossus. They are scored on how closely their own description overlaps with Ossus's, and all facts shown come from the YC company records — nothing is estimated.
What are the best alternatives to Ossus?
| 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 |
| primitive | communication for agents | Spring 2026 | 4 | Active |
| SingleStore | The cloud-native, operational database built for speed and scale. | Winter 2011 | 150 | Active |
| ProjectX | Agent native workspace for heavy parallel workflows on the web | Spring 2026 | 8 | Active |
| Riften | Earned intelligence for every company | Summer 2026 | 5 | Active |
| PhoneSys | The Phone System for Sales Teams. | Summer 2011 | 4 | Inactive |
| FathomDB | — | Winter 2008 | — | Inactive |
| Fivetran | The leader in automated data movement | Winter 2013 | 1200 | Active |
| Memorable | reducing agent reasoning into a graph search problem | Summer 2027 | 2 | Active |
| GoScale | Dynamical Scaling Virtual Machines as a Service | Summer 2012 | 2 | Inactive |
Is Ossus still active?
Ossus 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 Ossus. They are then ranked on how closely their own description overlaps with Ossus's, so the closest matches come first rather than whoever happens to share a tag.