Progress Semaphore vs Virtuoso Universal Server
| Progress Semaphore | Virtuoso Universal Server | |
|---|---|---|
| Free plan | No | No |
| Free trial | Yes | Yes |
| Paid from | — | — |
| Open source | No | No |
| Platforms | api, Linux, self-hosted, Web, Windows | api, Linux, macOS, self-hosted, Web, Windows |
| Free plan | No | — |
| Ontology modeling | Yes | — |
| Semantic reasoning | Yes | — |
| RDF/SPARQL support | Yes | — |
| Graph visualization | Yes | — |
| Import formats | RDF, Excel spreadsheets | — |
| Deployment | both | both |
| Query languages | SPARQL | — |
Both are listed in Best Knowledge Graph Software. On Specifiction, Virtuoso Universal Server scores higher on our published basis.