EtherFax vs Retarus Fax (2026): which should you pick?

Pick EtherFax if

• Fits if you are a hospital or clinic swapping faxes with Epic or OnBase
• Works for agencies that need a FedRAMP-listed fax service

Look elsewhere if

• Not for you if you want a price before you talk to anyone, because none is published
• Skip it if you are one person who wants to sign up and send a fax today
• Watch out: email faxing is described for Microsoft 365 and Google Workspace users only
• Watch out: it is pitched at organizations and workflows, so a small office may find it more than it needs

Pick Retarus Fax if

• Fits if you are a mid-size or large company moving fax into Outlook
• Works for teams that need fax tied to SAP or Epic

Look elsewhere if

• Skip it if you are an individual or small office, as it is aimed at larger companies
• Skip it if you want a price on the page, since none is published
• Not for you if you want a free trial, as none is listed
• Watch out: the starting page covers only the Microsoft 365 and Outlook option of a wider product line

EtherFax

• No prices are published; the site directs visitors to contact the company.
• Aimed at organizations, with no self-serve plan for individuals.
• Email faxing is described for Microsoft 365 and Google Workspace users.

Retarus Fax

• No prices are published; the site is built around scoping with a project team.
• Positioned for mid-size to large enterprises, not individuals or small offices.
• The page used as the starting URL describes the Microsoft 365 and Outlook option of a wider product line.

EtherFax

Engage fax application

A web-based client for sending, receiving and tracking faxes, with shared workspaces so incoming faxes go to teams rather than individuals.

Flow document routing

Flow acts as a digital mailroom that uses AI to open, sort and route incoming documents into a system of record.

Secure Exchange Network

Faxes sent between endpoints on the EtherFax network travel over its own cloud network instead of phone lines.

Scanner and printer integrations

Cloud faxing is built into Xerox and Lexmark firmware and integrates with Canon and Ricoh devices.

REST API

A developer API lets third-party applications send and receive faxes through the network.

Compliance claims

The site says its commercial environment complies with HIPAA and SOC 2 and is HITRUST and PCI DSS certified, and that its government service meets FedRAMP High.

Retarus Fax

Outlook and Microsoft 365

An Outlook add-in and Active Directory synchronization let Microsoft 365 users send and receive fax and SMS without in-house infrastructure.

Several ways in

Fax can be used through a web browser, Outlook, multifunction printers or a Windows application.

APIs and connectors

REST and SMTP interfaces are offered, plus pre-built connectors for applications such as Epic and SAP.

Web portal and tracking

IT teams configure services in a web portal, with real-time reporting on the status of individual faxes.

Global infrastructure

The page cites six data centers worldwide, multiple carriers and certifications including SOC 1, SOC 2, ISO 27001 and HITRUST.

Migration help

A named project team handles scoping, migration from fax servers, and custom integrations.

EtherFax

Pricing could not be confirmed. See etherfax.net.

Retarus Fax

Pricing could not be confirmed. See retarus.com.