Retarus Fax review (2026): is it worth it?
Enterprise cloud fax with Outlook, API and printer connections
Black Friday: is there a Retarus Fax sale?
Retarus Fax report card
Weak · out of 4.0 · graded Nov 13, 2026
Best for enterprise cloud fax with Outlook
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.
Who Retarus Fax is for
- 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
Who Retarus Fax is not for
- 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
Why Retarus Fax gets a 1.8
Five grades, each with its reason. The GPA is their average: an A is 4 points, an F is none.
- CValue for moneyNo prices are published; the site is built around scoping with a project team.
- FFree plan and trialNo free plan or trial is listed, so nothing can be tried without paying.
- CFeaturesOutlook and Microsoft 365, several ways in, APIs and connectors, a web portal with tracking, global infrastructure and migration help.
- CEase of useNo rating on record. A project team scopes it and you connect Outlook or an API.
- BPlatforms and integrationsWeb and Windows with Microsoft 365, Outlook, Epic, SAP and Active Directory.
What these grades rest on. 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. How we review and grade.
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<a href="https://toolgpa.com/tools/retarus-fax#review"><img src="https://toolgpa.com/badge/retarus-fax.svg" alt="Retarus Fax: 1.8 GPA on ToolGPA" width="196" height="56"></a>Where Retarus Fax 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).
Each grade against the category
Every bar is all 25 online fax services we grade, cut by the letter each got. Retarus Fax’s own letter is outlined.
- CValue for moneyAbove 2 of 24, level with 13
- FFree plan and trialAbove 0 of 24, level with 10
- CFeaturesAbove 2 of 24, level with 11
- CEase of useAbove 3 of 24, level with 9
- BPlatforms and integrationsAbove 4 of 24, level with 15
Keep Retarus Fax, 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.
What you could make
- Reports: an app builder makes this well.
What you could not
- Fax numbers connected to the phone network.
- A real app for Windows. Something home-made would be a web page.
- It plugs into other products, Microsoft 365, Outlook and Epic among them, and has an API.
- What a company asks for before it lets staff use something: SOC 2.
What this rests on. Retarus Fax’s listing: what it does, where it runs, what it plugs into and what it costs. It is a judgement about the kind of software this is. We have not built a replacement for it, and making your own means looking after it too. How we decide, and every tool’s verdict.
What is Retarus Fax?
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.
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.
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.
Retarus Fax pricing
We could not confirm Retarus Fax’s current pricing from its own site, so we are not listing plans here. See retarus.com for current prices.
Works with
Retarus Fax alternatives
- Retarus Fax vs InterFAX
Free trial · from $9.95/mo
- Retarus Fax vs SRFax
From $10.70/mo
Common questions
Does Retarus Fax have an Android app?
No Android app was listed when its pages were read on Nov 13, 2026. Retarus Fax is listed for Web and Windows.
Does Retarus Fax have an iPhone app?
No iPhone app was listed when its pages were read on Nov 13, 2026. Retarus Fax is listed for Web and Windows.
Is Retarus Fax open source?
Retarus Fax is not described as open source on its own site, as read on Nov 13, 2026.
Does Retarus Fax have an API?
Yes. Retarus Fax offers a public API, according to its own site.
Sources for this page
The prices, plans, platforms and features above were read from these pages on Nov 13, 2026.