| Price from | $18.99/mo | $10/mo |
| Free plan | — | — |
| Free trial | Yes | — |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | Yes | — |
| macOS | Yes | — |
| iOS | Yes | — |
| Android | Yes | Yes |
| API | Yes | — |
| Plans published | 3 | 1 |
| Spec score · Online Fax Services | 9.2 (#1) | 7.7 (#64) |
| Spec score · Fax APIs | 9.3 (#1) | 8.0 (#13) |
| Spec score · Online fax services | 9.1 (#4) | 7.7 (#66) |
| API | eFax offers an API for integrating fax transmission with applications and business workflows. | The REST API uses HTTP Basic Authentication with API access and secret keys, and its documented rate limit is five requests per second. |
| Free plan | No | No |
| Headquarters | Los Angeles, California, United States | Ridgewood, New Jersey, United States |
| Inbound faxing | Yes | Yes |
| International faxing | Yes | No |
| Mobile apps | eFax provides Android and iOS applications for sending and receiving faxes from smartphones and tablets. | Yes |
| Virtual fax number | Yes | Yes |
