| Price from | $18.99/mo | $60/mo |
| Free plan | — | — |
| Free trial | Yes | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | Yes | Yes |
| macOS | Yes | — |
| iOS | Yes | — |
| Android | Yes | — |
| API | Yes | Yes |
| Self-hosted | — | Yes |
| Plans published | 3 | 5 |
| Spec score · Online Fax Services | 9.2 (#1) | 9.1 (#2) |
| Spec score · Fax APIs | 9.3 (#1) | 9.0 (#2) |
| Spec score · Online fax services | 9.1 (#4) | 9.0 (#7) |
| Spec score · eFax Software | 9.3 (#1) | 8.9 (#3) |
| API | eFax offers an API for integrating fax transmission with applications and business workflows. | FaxCore provides a REST API at no charge, with sample code and assistance. |
| Company history | Consensus says the eFax brand has been established for more than 25 years. | FaxCore describes itself as a provider of fax servers and cloud-based faxing since 2002. |
| Compliance | Official materials cite HIPAA, SOX, GLBA, PCI-DSS, FERPA and HITRUST CSF certification for corporate offerings. | FaxCore states that its Azure-hosted service is SOC 2 operated and supports PCI- and HIPAA-compliant faxing. |
| Compliance support | hipaa | hipaa |
| Founded | 1999 | 2002 |
| Free plan | No | No |
| Headquarters | Los Angeles, California, United States | Parker, Colorado, United States |
| Inbound faxing | Yes | Yes |
| International faxing | Yes | Yes |
| Licence | The customer agreement describes a hosted service supplied by Consensus entities and does not provide an open-source licence. | FaxCore is distributed as a commercial product with a license-management utility; no open-source licence is stated. |
| Monthly page allowance | 200 | 500 |
| Other integrations | eFax lists a Windows Router, multifunction-printer connectivity and an SAP connector. | The product lists SAP, Epic, Sharp OSA, Konica Minolta OpenAPI, Xerox EIP, and Ricoh ESA connectors. |
| What it does | eFax sends, receives, stores and signs faxes through email, web portals, mobile devices and cloud services without a physical fax machine. | FaxCore is an enterprise fax server offered on premises, in a hybrid etherFAX configuration, or as a cloud service. |
