Retarus Fax vs SRFax (2026): which should you pick?
As of Nov 13, 2026, SRFax grades higher than Retarus Fax: 2.0 against 1.8 out of 4.0.
Checked Nov 12, 2026 and Nov 13, 2026 · graded Nov 12, 2026 and Nov 13, 2026 by ToolGPA
SRFax grades higher on features. They get the same grade on value for money, the free plan, ease of use and platforms.
Price, platforms and features side by side. The table says where each price was read and when.
Retarus Fax
Enterprise cloud fax with Outlook, API and printer connections
Which one is for you
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
Pick SRFax if
- Fits if you run a US or Canadian clinic that needs HIPAA or PHIPA faxing
- Works for developers adding email-to-fax to their software
Look elsewhere if
- Skip it if you want small-business prices, as the plans page shows none for that family
- Tight if you want a trial or free plan, since neither is on record
- Watch out: sent and received pages are combined in one allowance, then $0.04 to $0.05 a page
- Tight if you need support at weekends or nights: it runs Monday to Friday, 6 am to 5 pm Pacific
How we grade them
| 1.8GPARetarus FaxWeak | 2.0GPASRFaxFair | |
|---|---|---|
| Value for money | CNo prices are published; the site is built around scoping with a project team. | C$10.70 a month on yearly billing for 200 pages combined, or $12.60 monthly, in the category's middle. Extra pages cost $0.05 each. |
| Free plan and trial | FNo free plan or trial is listed, so nothing can be tried without paying. | FNo free plan and no trial are on record. |
| Features | COutlook and Microsoft 365, several ways in, APIs and connectors, a web portal with tracking, global infrastructure and migration help. | BEmail-to-fax, a web portal, a REST API, PGP at no charge, a BAA on request, porting, unlimited storage, a printer driver and optional OCR. The listing shows no gap in the fax job. |
| Ease of use | CNo rating on record. A project team scopes it and you connect Outlook or an API. | CNo store rating on record. Setup means choosing a plan, a number and a connection such as email, the portal or the API. |
| Platforms and integrations | BWeb and Windows with Microsoft 365, Outlook, Epic, SAP and Active Directory. | BWeb portal and email, with a REST API and a printer driver. No native desktop or mobile app is listed. |
| Best for | enterprise cloud fax with Outlook | HIPAA-ready fax for clinics |
The GPA is the average of the five grades: an A is 4 points, an F is none. The full reasons are on each tool's page: Retarus Fax and SRFax. How we grade
Where they differ
- Retarus Fax also covers reports.
At a glance
| Retarus Fax | SRFax | |
|---|---|---|
| Pricing | Paid | Paid |
| Starts at | Not published | $10.70 per month for 200 pages, billed annually ($12.60 billed monthly) |
| Free plan | None | None |
| Free trial | None listed | None listed |
| Web | ||
| Windows | ||
| Made by | Retarus | SRFax |
| Price read from | Not confirmed | srfax.com |
| Checked | Nov 13, 2026 | Nov 12, 2026 |
Worth knowing
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.
SRFax
- The published prices are healthcare plans; the Standard plan family for small businesses shows no prices on the plans page.
- Page allowances combine sent and received pages, and extra pages cost $0.04 to $0.05 each.
- Support hours are Monday to Friday, 6 am to 5 pm Pacific time.
- No native desktop or mobile app is listed; the service works through email, the portal and the API.
Key features
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.
SRFax
- Email to fax and web portal
- Send and receive faxes from an existing email account, a web application or a mobile device, with up to 50 recipients scheduled at once.
- REST fax API
- A RESTful API adds email-to-fax to other software, with downloadable classes in PHP, Ruby, C# and VB.
- Security options
- Password protection and SSL encryption are standard, and PGP encryption is offered at no charge. A BAA can be requested.
- Numbers and porting
- Keep an existing number through porting or get a new local or toll-free number; extra numbers cost $4.95 each.
- Storage, printer driver and downloader
- Unlimited online storage, a printer driver for faxing from other programs, a downloader, and optional OCR are listed across plans.
Plans
Retarus Fax
Pricing could not be confirmed. See retarus.com.
SRFax
Healthcare Lite$10.70
per month for 200 pages, billed annually ($12.60 billed monthly)
200 sent and received pages combined a month; $0.05 per extra page. Annual billing saves 15%.
Healthcare Basic$13.65
per month for 500 pages, billed annually ($16.05 billed monthly)
500 pages combined a month; $0.05 per extra page. Steps between Lite and Standard also exist.
Healthcare Standard$35.15
per month for 1,500 pages, billed annually ($41.35 billed monthly)
1,500 pages combined a month; $0.05 per extra page.
Healthcare Professional$117.20
per month for 5,000 pages, billed annually ($137.90 billed monthly)
5,000 pages combined a month; $0.05 per extra page.
Healthcare Professional Premium$468.80
per month for 20,000 pages, billed annually ($551.55 billed monthly)
20,000 pages combined a month; $0.04 per extra page. Larger volumes go to sales.
Ways to pay less
Retarus Fax
No public discounts listed.
SRFax
- Annual discount
15% off with annual billing
Every healthcare plan shows a 15% saving when paid yearly, such as $128.40 a year for Lite against $12.60 a month.
Common questions
Which is cheaper, Retarus Fax or SRFax?
As of Nov 13, 2026, Retarus Fax has no price we could confirm, and SRFax starts at $10.70 per month for 200 pages, billed annually ($12.60 billed monthly).
Which has a free plan, Retarus Fax or SRFax?
As of Nov 13, 2026, neither Retarus Fax nor SRFax has a free plan.
Which platforms do Retarus Fax and SRFax run on?
As of Nov 13, 2026, only Retarus Fax lists a Windows app. Both list a web app. A platform missing from a listing is one its maker's pages did not mention.
More comparisons
How this page was made
- The verdict at the top follows a fixed rule. When both tools are in the same category and either is in our top three for it, the verdict follows that ranking: the higher-placed tool is our pick. The top three weigh who each tool suits as well as its grades, so a pick can go against the GPA. Otherwise the page does not pick one and says which grades higher: the higher GPA first; on a tie, the one with a free plan, then the one that starts cheaper in dollars a month, counted the same way for both; if they are still level, what the choice depends on.
- The grades are our own, from each tool’s review or report card. The GPA is their average.
- Prices, plans and platforms come from each tool’s listing. The table above says where each price was read and when.
- The differences and the answers to the questions are worked out from those listings.