Avast One vs System Ninja
| Avast One | System Ninja | |
|---|---|---|
| Free plan | No | No |
| Free trial | No | No |
| Paid from | — | $1.25/mo |
| Open source | No | No |
| Platforms | Android, iOS, macOS, Windows | Windows |
| Free plan | No | Yes |
| Paid from | $65.99/yr | $14.95/yr |
| Junk cleanup | Yes | Yes |
| Startup manager | Yes | Yes |
| Scheduled maintenance | Yes | — |
| Windows support | windows 10 and 11 | windows 10 and 11 |
| Device limit | 1 devices | 10 devices |
Both are listed in Best PC Optimization Software. On Samsung Mobile US Press, Avast One scores higher on our published basis.