Esper vs Feldera
| Esper | Feldera | |
|---|---|---|
| Free plan | Yes | Yes |
| Free trial | No | No |
| Paid from | Free | Free |
| Open source | No | No |
| Platforms | api, Linux, self-hosted, Windows | api, Linux, macOS, self-hosted, Web, Windows |
| Free plan | Yes | Yes |
| Deployment model | self-hosted | hybrid |
| SQL processing | Yes | Yes |
| Stateful processing | Yes | Yes |
| Event-time windows | Yes | Yes |
| Supported languages | Java, C# | SQL |
| Source connectors | — | 14 |
Both are listed in Best Stream Processing Software. On Freedom251, Feldera scores higher on our published basis.