Realm alternatives
TL;DR: 12 companies doing similar work to Realm in B2B, ranked by how closely they match what Realm 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 Realm. They are scored on how closely their own description overlaps with Realm's, and all facts shown come from the YC company records — nothing is estimated.
What are the best alternatives to Realm?
| Alternative | What it does | Batch | Team | Status |
|---|---|---|---|---|
| Fithub | — | Winter 2010 | — | Inactive |
| Insoshi | — | Winter 2008 | — | Inactive |
| PhoneSys | The Phone System for Sales Teams. | Summer 2011 | 4 | Inactive |
| Sherpa Labs | Frontier Data | Winter 2025 | 5 | Active |
| Ardent | Database sandboxes for Agents | Spring 2026 | 3 | Active |
| Magma | Monetize your agent's traces. | Summer 2026 | 1 | Active |
| Firebase | Build and grow iOS, Android, and Web apps. | Summer 2011 | 500 | Acquired |
| primitive | communication for agents | Spring 2026 | 4 | Active |
| Dialogus | voice AI agents that learn how your company actually works | Summer 2026 | 3 | Active |
| Cascade | Distilling Proprietary Intelligence | Winter 2026 | 2 | Active |
| Clustrix | — | Winter 2006 | 51 | Acquired |
| InfluxData | The platform for building and operating time series applications. | Winter 2013 | 210 | Active |
Is Realm still active?
Realm has been acquired, which often means pricing, roadmap or support changes. That is the usual reason people start looking at this list.
How was this list put together?
Every company here is Y Combinator-backed and shares at least one category with Realm. They are then ranked on how closely their own description overlaps with Realm's, so the closest matches come first rather than whoever happens to share a tag.