Helium Browser vs Onion Browser
| Helium Browser | Onion Browser | |
|---|---|---|
| Free plan | Yes | Yes |
| Free trial | No | No |
| Paid from | Free | Free |
| Open source | Yes | Yes |
| Platforms | Windows, macOS, Linux | iOS |
| Free plan | Yes | Yes |
| Supported platforms | both | mobile |
| Browser engine | chromium | — |
| Built-in ad blocking | Yes | — |
| Extension support | chrome_store | — |
| Cross-device sync | No | — |
| Open source | Yes | Yes |
Both are listed in Best Web Browsers. On Freedom251, Helium Browser scores higher on our published basis.