# Retarus Fax review (2026): is it worth it? > Enterprise cloud fax with Outlook, API and printer connections Checked Nov 13, 2026 ยท graded Nov 13, 2026 by ToolGPA. Retarus Enterprise Cloud Fax is a fax service for mid-size and large organizations, especially in regulated industries. Users send and receive from a browser, Outlook, multifunction printers or a Windows application, and IT teams use a web portal for administration. No prices are published. - **Category:** Online Fax - **Made by:** Retarus - **Website:** https://www.retarus.com/fax-and-sms-for-office-365-and-outlook - **Runs on:** Web, Windows - **Who should skip it:** Skip it if you are an individual or small office, as it is aimed at larger companies. - **Facts last checked:** Nov 13, 2026 ## Pricing Retarus Fax's current pricing could not be confirmed from its own site. ## Key features - **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. ## Good for - Large organizations with high or fluctuating fax volume - Healthcare and finance teams needing Epic or SAP connections - Microsoft 365 shops that want fax inside Outlook ## Worth knowing - 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. ## ToolGPA grades **GPA: 1.8 out of 4**, graded Nov 13, 2026. Retarus Fax is a cloud fax service built for mid-size to large companies, with Outlook, API and printer connections. No prices are published and it is scoped with a project team, so it is aimed at organizations, not individuals. - **Value for money: C.** No prices are published; the site is built around scoping with a project team. - **Free plan and trial: F.** No free plan or trial is listed, so nothing can be tried without paying. - **Features: C.** Outlook and Microsoft 365, several ways in, APIs and connectors, a web portal with tracking, global infrastructure and migration help. - **Ease of use: C.** No rating on record. A project team scopes it and you connect Outlook or an API. - **Platforms and integrations: B.** Web and Windows with Microsoft 365, Outlook, Epic, SAP and Active Directory. These are ToolGPA's own grades. Graded from this listing, whose facts were read from Retarus's own pages on 13 November 2026. Not based on using the product, and shorter than our full reviews. ## Where it stands among online fax services - Retarus Fax's GPA of 1.8 is higher than 1 of the 24 other online fax services we grade, and level with 3. - It stands best on platforms and integrations (B, above 4 of 24) and worst on free plan and trial (F, above 0). The category's chart of price against score: https://toolgpa.com/charts/online-fax ## Keep it, or make your own? **Keep it.** To replace Retarus Fax you would be making fax numbers connected to the phone network. That is not a weekend's work, with an AI app builder or without one. That makes this kind of software worth paying for, not this one in particular: 20 of the 24 other online fax services grade higher. - You could make: Reports: an app builder makes this well. - You could not: Fax numbers connected to the phone network. - You could not: A real app for Windows. Something home-made would be a web page. - You could not: It plugs into other products, Microsoft 365, Outlook and Epic among them, and has an API. - You could not: What a company asks for before it lets staff use something: SOC 2. A judgement by ToolGPA from this listing, by rules that are the same for every tool. Nothing was built to test it. ## Works with Microsoft 365, Outlook, Epic, SAP, Active Directory **Tags:** Online fax, Public API, Reports ## Alternatives - [InterFAX](https://toolgpa.com/tools/interfax): Cloud fax by subscription or prepaid credit, with REST and SOAP APIs. [Compare](https://toolgpa.com/compare/interfax-vs-retarus-fax) - [EtherFax](https://toolgpa.com/tools/etherfax): Cloud fax network and AI document workflows for organizations. [Compare](https://toolgpa.com/compare/etherfax-vs-retarus-fax) - [FaxCore](https://toolgpa.com/tools/faxcore): Fax server software run on-premise, in the cloud or hybrid. [Compare](https://toolgpa.com/compare/faxcore-vs-retarus-fax) - [OpenText Fax (RightFax)](https://toolgpa.com/tools/rightfax): Enterprise fax server software that connects to EHR and ERP systems. [Compare](https://toolgpa.com/compare/retarus-fax-vs-rightfax) - [SRFax](https://toolgpa.com/tools/srfax): Email-to-fax service with HIPAA plans and a REST API. [Compare](https://toolgpa.com/compare/retarus-fax-vs-srfax) ## Sources The prices, plans, platforms and features above were read from these pages on Nov 13, 2026: - https://www.retarus.com/fax-and-sms-for-office-365-and-outlook - https://www.retarus.com/cloud-fax/ - https://www.retarus.com/about-retarus/ Page: https://toolgpa.com/tools/retarus-fax Listed by ToolGPA (toolgpa.com).