Opera vs SigmaOS
| Opera | SigmaOS | |
|---|---|---|
| Free plan | Yes | No |
| Free trial | Yes | No |
| Paid from | $0.33/mo | — |
| Open source | No | No |
| Platforms | Android, extension, iOS, Linux, macOS, Web, Windows | macOS |
| Free plan | Yes | Yes |
| Supported platforms | both | desktop |
| Browser engine | chromium | webkit |
| Built-in ad blocking | Yes | Yes |
| Extension support | both | both |
| Cross-device sync | Yes | Yes |
| Paid from | — | $20/mo |
Both are listed in Best Web Browsers. On Inferse, Opera scores higher on our published basis.