The Retarus Fax Insider’s Guide
Everything we know about Retarus Fax in one document: what it costs, its grades, getting a refund, getting help and what else to look at. Read it here, or keep a copy.
Retarus Fax
The Insider’s Guide
Enterprise cloud fax with Outlook, API and printer connections
Every plan, grade, refund rule and rival among online fax services, read from Retarus Fax’s own pages.
Made by Retarus · checked Nov 13, 2026 · toolgpa.com
Contents
- 01WelcomeWhat it is, who it suits, its grades and the ten things to know first
- 02What it costsEvery plan, the free plan, ways to pay less and how prices have moved
- 03What it doesIts main features, where it runs, what it works with and who makes it
- 04Where it standsIts grades against its category, and whether to keep it or make your own
- 05The alternativesThe tools it is most often weighed against, side by side
- 06Quick answersThe questions people ask about it, each answered in a line or two
- 07About ToolGPAWho made this guide, what else is on the site, and how to cite it
ToolGPA put this guide together from Retarus Fax’s own pages, its app-store listings and our grades. Every fact in it is on Retarus Fax’s page too, where it is kept up to date. Checked Nov 13, 2026.
Part 01 · Overview
Welcome
What it is, who it suits, its grades and the ten things to know first
1.8
GPA, above 1 of the 24 other online fax services we grade
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.
To get you started, here are 7 things to know about Retarus Fax, taken from its own pages and our grades.
No prices are published and it is scoped with a project team, so it is aimed at organizations, not individuals.
- 1
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.
- 2
It runs on 2 platforms
Web and Windows.
- 3
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.
- 4
Several ways in
Fax can be used through a web browser, Outlook, multifunction printers or a Windows application.
- 5
APIs and connectors
REST and SMTP interfaces are offered, plus pre-built connectors for applications such as Epic and SAP.
- 6
A 1.8 GPA, above 1 of 24
That is against the other online fax services we grade, on value, the free plan, features, ease of use and platforms.
- 7
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.
Retarus Fax at a glance
- Pricing
- Paid
- Free plan
- No
- Free trial
- None stated
- Runs on
- Web, Windows
- Made by
- Retarus
- Category
- Online Fax
- Our grade
- 1.8 GPA, weak
The report card
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.
| Subject | Grade | Comment |
|---|---|---|
| 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. |
An A is worth 4 points, a B 3, a C 2, a D 1 and an F nothing. The GPA is the average of the five.
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 it 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
Good to know
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.
Part 02 · Pricing
What it costs
Every plan, the free plan, ways to pay less and how prices have moved
Retarus Fax's current pricing could not be confirmed from its own site.
No prices are published; the site is built around scoping with a project team.
We could not confirm Retarus Fax’s current prices from its own site, so this guide lists no plans. retarus.com has them.
Part 03 · Features
What it does
Its main features, where it runs, what it works with and who makes it
2
Places it runs: Web and Windows
Enterprise cloud fax with Outlook, API and printer connections. Here is what it does, as its own site describes it, and what it covers: public API, reports, online 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.
Where it runs
- Web
- Windows
What it works with
- Microsoft 365
- Outlook
- Epic
- SAP
- Active Directory
Retarus Fax is made by Retarus.
Part 04 · Standing
Where it stands
Its grades against its category, and whether to keep it or make your own
1/24
Other online fax services it is graded above
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
- FFree plan and trialAbove 0 of 24
- CFeaturesAbove 2 of 24
- CEase of useAbove 3 of 24
- BPlatforms and integrationsAbove 4 of 24
Keep it, or make your own?
Whether this is something you could build for yourself with an AI app builder, and what you would give up.
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.
Part 05 · Alternatives
The alternatives
The tools it is most often weighed against, side by side
InterFAX, EtherFax, FaxCore, OpenText Fax (RightFax) and SRFax
The 5 tools Retarus Fax is most often weighed against, with where each one differs from it.
- 2.4GPA
InterFAX
Free trial · from $9.95/mo
Cloud fax by subscription or prepaid credit, with REST and SOAP APIs.
- Only Retarus Fax lists a Windows app.
- Retarus Fax also covers reports.
- InterFAX also covers workflow automation.
- 2.0GPA
EtherFax
Paid
Cloud fax network and AI document workflows for organizations.
- Only Retarus Fax lists a Windows app.
- Retarus Fax also covers reports.
- EtherFax also covers workflow automation.
- 1.6GPA
FaxCore
Paid
Fax server software run on-premise, in the cloud or hybrid.
- Retarus Fax also covers reports.
- FaxCore also covers workflow automation.
- 1.8GPA
OpenText Fax (RightFax)
Paid
Enterprise fax server software that connects to EHR and ERP systems.
- Only Retarus Fax lists a Windows app.
- OpenText Fax (RightFax) also covers workflow automation.
- 2.0GPA
SRFax
From $10.70/mo
Email-to-fax service with HIPAA plans and a REST API.
- Only Retarus Fax lists a Windows app.
- Retarus Fax also covers reports.
Part 06 · Questions
Quick answers
The questions people ask about it, each answered in a line or two
11
Questions, each answered in a line or two
The short version of everything above, for when you only need the answer. Each one is told in full in its part of the guide.
Is Retarus Fax free?
No. Retarus Fax is a paid product.
What platforms does Retarus Fax work on?
Retarus Fax is available on Web and Windows.
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.
What does Retarus Fax integrate with?
Retarus Fax's listing names Microsoft 365, Outlook, Epic, SAP and Active Directory.
Who makes Retarus Fax?
Retarus Fax is made by Retarus.
What are the alternatives to Retarus Fax?
The closest alternatives to Retarus Fax in our directory are InterFAX, EtherFax, FaxCore, OpenText Fax (RightFax) and SRFax.
How does Retarus Fax compare with other 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.
Could I make my own version of Retarus Fax?
To replace Retarus Fax you would be making fax numbers connected to the phone network.
Where this guide comes from
The prices, plans, platforms and features were read from Retarus Fax’s own pages on Nov 13, 2026, and the grades were given on Nov 13, 2026. 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.
Every tool we list gets five grades, A to F, each with its reason, and a GPA that averages them. How each is decided is at toolgpa.com/grades. This guide is ToolGPA’s own work; it is not made, paid for or approved by Retarus. Prices change, so check retarus.com before you buy.
Part 07 · About
About ToolGPA
Who made this guide, what else is on the site, and how to cite it
7,721
Tools graded, in 95 categories
ToolGPA grades software the way a school report grades a pupil: five subjects, a letter for each with the reason written beside it, and a GPA that averages them. Prices, plans and platforms are read from each maker’s own pages and dated, so you always know how fresh a figure is.
Every grade, review and ranking on ToolGPA is our own judgement. No company can pay for a grade or change one. Every tool on the site has a guide like this one, free to download and pass on. It all lives at toolgpa.com.
7,721
tools graded
95
categories
739
price changes on record
579
apps priced in 12 countries
What else is on toolgpa.com
- Retarus Fax, kept up to dateEverything in this guide, with prices and grades as they are todaytoolgpa.com/tools/retarus-fax
- How grades are givenThe rules behind every letter and every GPAtoolgpa.com/grades
- Value chartsWhat each tool costs against what it scores, for every categorytoolgpa.com/charts
- CompareAny two tools side by side, plan by plantoolgpa.com/compare
- Price changesEvery price rise and cut on record, each with its sourcetoolgpa.com/price-changes
- Prices by countryWhat apps cost on the App Store in 12 countriestoolgpa.com/prices-by-country
- Pay lessEvery public discount: yearly billing, students, nonprofitstoolgpa.com/save
- Keep or makeWhich tools are worth paying for, and which you could build yourselftoolgpa.com/keep-or-make
Scan for the live page
Prices and grades as they are today
Quoting this guide?
Please name ToolGPA and link to the live page, so readers can check the figures for themselves:
ToolGPA, "Retarus Fax: The Insider's Guide", checked Nov 13, 2026. https://toolgpa.com/tools/retarus-fax
Know someone choosing between online fax services?
Send them this guide: toolgpa.com/tools/retarus-fax/guide
ToolGPA elsewhere: youtube.com/@toolgpa
See our other guides
The best-graded online fax services after Retarus Fax, each with an Insider's Guide of its own.
- Online Fax Insider's GuideEvery one of the 25 online fax services we grade, compared
- Fax.Plus Insider's GuideOnline fax by web, email, desktop and mobile apps, priced by pages3.0 GPA
- eFax Insider's GuideOnline fax by email, web and apps, with personal and business plans2.8 GPA
- iFax Insider's GuideOnline fax apps and fax API, with HIPAA plans and AI fax reading2.6 GPA
Choosing software? Every tool graded, every price dated.
Compare tools at toolgpa.com ›Everything in this guide is ToolGPA’s own summary of what Retarus Fax’s pages, its app-store listings and public reviews said on the dates shown. Grades are our judgement under the rules at toolgpa.com/grades. Every grade, review and ranking on ToolGPA is our own judgement. No company can pay for a grade or change one. Retarus Fax is a trademark of its owner, and this guide is not made, paid for or approved by Retarus. Prices and plans change: check retarus.com before you buy.