s2.dev alternatives
TL;DR: 12 companies doing similar work to s2.dev in B2B, ranked by how closely they match what s2.dev 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 s2.dev. They are scored on how closely their own description overlaps with s2.dev's, and all facts shown come from the YC company records — nothing is estimated.
What are the best alternatives to s2.dev?
| 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 |
| Magma | Monetize your agent's traces. | Summer 2026 | 1 | Active |
| Terse | Durable state for AI agents | Fall 2026 | 2 | Active |
| Memory Store | Company Brain. | Spring 2026 | 4 | Active |
| Ardent | Database sandboxes for Agents | Spring 2026 | 3 | Active |
| Hub | Real-world training data for frontier AI labs and robotics. | Spring 2026 | 10 | Active |
| PhoneSys | The Phone System for Sales Teams. | Summer 2011 | 4 | Inactive |
| Compresr | LLM context compression for better accuracy | Winter 2026 | 3 | Active |
| Sazabi | The AI-native observability platform for fast-moving engineering teams | Spring 2026 | 10 | Active |
Is s2.dev still active?
s2.dev 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 s2.dev. They are then ranked on how closely their own description overlaps with s2.dev's, so the closest matches come first rather than whoever happens to share a tag.