| Price from | — | Free |
| Free plan | — | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | — | Yes |
| Windows | Yes | Yes |
| macOS | Yes | Yes |
| Linux | Yes | Yes |
| iOS | — | Yes |
| Android | — | Yes |
| API | — | Yes |
| Self-hosted | — | Yes |
| Plans published | 0 | 5 |
| Spec score · Data Federation Software | 7.3 (#18) | 8.4 (#4) |
| License | PlyDB is open source under the Apache 2.0 license. | Stardog Free is proprietary, licensed software and the pricing FAQ explicitly says it is not open source. |
| What it does | PlyDB is an open-source database gateway that lets AI agents query live data sources using standard SQL. | Stardog is a semantic AI and enterprise knowledge-graph platform that unifies data and adds business context for analytics, applications and AI. |
