| Price from | Free | Free |
| Free plan | Yes | Yes |
| Free trial | Yes | — |
| Open source | — | — |
| Web | Yes | — |
| Windows | Yes | Yes |
| macOS | Yes | Yes |
| Linux | Yes | Yes |
| API | Yes | — |
| Self-hosted | Yes | — |
| Plans published | 5 | 1 |
| Spec score · Diagramming Software | 9.3 (#1) | 7.7 (#37) |
| Spec score · Diagram Software | 9.3 (#1) | 7.7 (#27) |
| Spec score · Flowchart Software | 9.4 (#1) | 7.7 (#15) |
| Spec score · Diagramming tools | 9.3 (#3) | 7.2 (#41) |
| Free plan | Yes | Yes |
| License | The desktop EULA says the software is licensed rather than sold, prohibits redistribution and reverse engineering, and reserves intellectual-property rights to Cinergix. | The site describes Dia as free software under the GNU General Public License, GPLv2. |
| Support | The pricing page lists email support for Starter and email/chat support for Team; its help center says support is available 24x7. | For problems, the site directs users to its FAQ and Dia bug reports. |
