| Price from | $18.99/mo | $12.60/mo |
| Free plan | — | — |
| Free trial | Yes | — |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | Yes | Yes |
| macOS | Yes | Yes |
| iOS | Yes | Yes |
| Android | Yes | Yes |
| API | Yes | Yes |
| Plans published | 3 | 8 |
| Spec score · Online Fax Services | 9.2 (#1) | 8.8 (#16) |
| Spec score · Fax APIs | 9.3 (#1) | 8.1 (#10) |
| Spec score · Online fax services | 9.1 (#4) | 8.6 (#21) |
| Spec score · eFax Software | 9.3 (#1) | 8.1 (#12) |
| Compliance support | hipaa | hipaa |
| Founded | 1999 | SRFax says it started its email-to-fax service in 2004. |
| Free plan | No | No |
| Headquarters | Los Angeles, California, United States | SRFax describes itself as headquartered in British Columbia, Canada. |
| Inbound faxing | Yes | Yes |
| International faxing | Yes | Yes |
| Mobile apps | eFax provides Android and iOS applications for sending and receiving faxes from smartphones and tablets. | Yes |
| Monthly page allowance | 200 | 200 |
| Rating on Trustpilot | 4.3 out of 5 from 2,371 reviews | 4.8 out of 5 from 293 reviews |
| Security encryption | eFax Corporate states that TLS protects data in transit and AES-256 protects stored data. | The security overview describes HTTPS, AES256 message encryption and optional endpoint IP restrictions for web services. |
| Virtual fax number | Yes | Yes |
| What it does | eFax sends, receives, stores and signs faxes through email, web portals, mobile devices and cloud services without a physical fax machine. | SRFax provides internet faxing that replaces fax machines, phone circuits and fax boards with online sending and receiving. |
