Days vs Shadow
| Days | Shadow | |
|---|---|---|
| Free plan | No | No |
| Free trial | No | No |
| Paid from | — | — |
| Open source | No | No |
| Platforms | Linux | Linux |
| Simulation model | discrete-event | hybrid |
| Automation API | Yes | Yes |
| Free plan | — | Yes |
| Real-time emulation | — | No |
Both are listed in Best Network Simulation Software. On Freedom251, Days scores higher on our published basis.