| Price from | — | — |
| Free plan | — | — |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | Yes | Yes |
| macOS | Yes | — |
| Linux | Yes | — |
| API | Yes | Yes |
| Self-hosted | Yes | Yes |
| Plans published | 0 | 3 |
| Spec score · Data Virtualization Software | 7.9 (#11) | 7.4 (#19) |
| Deployment | Ontop can be deployed as a SPARQL endpoint using its command-line interface or Docker image. | Querona says it runs entirely on customer-controlled infrastructure, including on-premise, cloud, or hybrid environments. |
| Headquarters | Bolzano, Italy | The company page lists its CEE office at Kwitnącego Sadu 8, 02-202 Warsaw, Poland. |
| Purpose | Ontop exposes relational database contents as virtual knowledge graphs and translates SPARQL queries into SQL queries executed by the source databases. | Querona describes itself as a data virtualization platform that connects data sources in a virtual database for analytics and reporting. |