PSI Secure Browser vs Questionmark
| PSI Secure Browser | Questionmark | |
|---|---|---|
| Free plan | No | No |
| Free trial | No | No |
| Paid from | — | — |
| Open source | No | No |
| Platforms | extension, Linux, macOS, Windows | Web |
| Supported platforms | Windows, macOS, Ubuntu Linux | — |
| Blocks app switching | Yes | — |
| Blocks copy and printing | Yes | — |
| Blocks screen capture | Yes | — |
Both are listed in Best Lockdown Browser Software. On Samsung Mobile US Press, PSI Secure Browser scores higher on our published basis.