OPBX vs Zadarma
| OPBX | Zadarma | |
|---|---|---|
| Free plan | Yes | |
| Paid from | $44/mo | |
| Platforms | Web, Windows, macOS, iOS, Android | |
| Free plan | Yes | Yes |
| Call routing | custom | custom |
| Included users | 10 users | |
| Business numbers | multiple | |
| Auto attendant | Yes | |
| Voicemail transcription | Yes | |
| Desktop and mobile apps | Yes |
Listed together in Best Business Phone Systems