InterFAX vs SRFax (2026): which should you pick?
As of Nov 12, 2026, InterFAX grades higher than SRFax: 2.4 against 2.0 out of 4.0.
Checked Nov 12, 2026 · graded Nov 12, 2026 by ToolGPA
InterFAX grades higher on the free plan. They get the same grade on value for money, features, ease of use and platforms.
Price, platforms and features side by side. The table says where each price was read and when.
InterFAX
Cloud fax by subscription or prepaid credit, with REST and SOAP APIs
Which one is for you
Pick InterFAX if
- Fits if you want to add fax to your own software through an API
- Works for healthcare and finance teams that need compliance statements
Look elsewhere if
- Skip it if you want a yearly rate, as prices are shown monthly only
- Tight if you want toll-free numbers or several lines, which need a custom quote
- Watch out: PCI DSS compliant outbound faxing costs an extra per-fax fee that isn't published
- Skip it if you fax twice a year from a home office, as the pitch is built for developers and IT teams
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
| 2.4GPAInterFAXFair | 2.0GPASRFaxFair | |
|---|---|---|
| Value for money | C$9.95 a month for 100 inbound and 100 outbound pages, matching the category's $9.95 middle. Extra pages are $0.09 each, and long pages are billed in six-second steps. | 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 | CA free trial on monthly plans, which the product page describes as 30 days of free credits. The listing doesn't say if a card is needed. | FNo free plan and no trial are on record. |
| Features | BREST, SOAP and SMTP APIs, Gmail and Outlook sending, Salesforce and healthcare connectors, and SOC 2, ISO 27001 and HIPAA statements. The listing shows no gap in the fax job itself. | 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 store rating on record. The pitch is built around developers and IT teams wiring fax into other software. | 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 admin, with REST, SOAP and SMTP APIs, code libraries on GitHub, and Epic, OncoEMR and Salesforce connectors. No phone or desktop app is listed. | BWeb portal and email, with a REST API and a printer driver. No native desktop or mobile app is listed. |
| Best for | fax with an API and compliance papers | 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: InterFAX and SRFax. How we grade
Price against what you get
InterFAX starts at $9.95 a month and scores 2.7 out of 4 on features, ease of use and platforms. SRFax starts at $10.70 a month and scores 2.7.
They score the same, and InterFAX starts $0.75 a month lower. Of the other online fax services on the chart, 2 score higher than InterFAX for less, and 3 score higher than SRFax for less.
Features, ease of use and platforms, averaged
What paid plans start at, a month (each step along is roughly double) →
- The best score at each price
- Has a free plan
- No free plan
Where they differ
- InterFAX also covers workflow automation.
At a glance
| InterFAX | SRFax | |
|---|---|---|
| Pricing | Free trial | Paid |
| Starts at | $9.95 per month for 100 inbound and 100 outbound pages, billed monthly | $10.70 per month for 200 pages, billed annually ($12.60 billed monthly) |
| Free plan | None | None |
| Free trial | Free trial on monthly plans; the product page offers 30 days of free credits | None listed |
| Web | ||
| Made by | Upland Software, Inc. | SRFax |
| Price read from | uplandsoftware.com | srfax.com |
| Checked | Nov 12, 2026 | Nov 12, 2026 |
Worth knowing
InterFAX
- Subscription prices are shown monthly only; no annual rates are listed.
- Pages longer than one minute are charged in six-second increments at one-tenth of the per-page cost.
- Toll-free numbers, multiple lines and larger prepaid packages need a custom quote from sales.
- PCI DSS compliant outbound faxing costs an additional fee per fax; the fee is not published.
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
InterFAX
- REST, SOAP and SMTP APIs
- Developers can add faxing to an application with REST, SOAP or SMTP APIs and GitHub libraries for Java, .NET, PHP, Ruby and more.
- Email and desktop integrations
- Send faxes from Gmail, Outlook or any email client over SMTP, and fax from inside Salesforce.
- Healthcare integrations
- Connectors are listed for Epic 2017 and later and for OncoEMR, with HIPAA and PHIPA alignment stated for inbound and outbound faxes.
- Compliance options
- The vendor lists SOC 2 audited, ISO 27001 accredited and HIPAA compliant, plus PCI DSS compliant outbound faxing for a small extra fee per fax.
- Web admin and worldwide servers
- A web admin screen monitors usage, and servers in several regions are offered for data sovereignty.
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
InterFAX
Fax + 200$9.95
per month for 100 inbound and 100 outbound pages, billed monthly
Local fax number included, no setup fee or contract; $0.09 per additional page.
Fax + 500$22.95
per month for 250 inbound and 250 outbound pages, billed monthly
Local number included, no contract; $0.09 per additional page.
Fax + 1000$42.95
per month for 500 inbound and 500 outbound pages, billed monthly
Local number included, no contract; $0.08 per additional page.
CustomCustom
Built with sales: toll-free numbers, multiple lines, extra security options and data sovereignty at high volume.
Pre-paid Basic$10
one-time purchase of 91 pages at $0.11 per page
No monthly commitment or minimum. A $50 Level 1 package gives 500 pages at $0.10; larger packages come from sales.
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
InterFAX
- Other savings
Free developer program with free faxing to one number
InterFAX says its free Developer program includes API access, free faxing to one number and expert support.
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, InterFAX or SRFax?
As of Nov 12, 2026, InterFAX is cheaper to start with: $9.95 a month, against $10.70 a month for SRFax. InterFAX starts at $9.95 per month for 100 inbound and 100 outbound pages, billed monthly, and SRFax starts at $10.70 per month for 200 pages, billed annually ($12.60 billed monthly).
Which has a free plan, InterFAX or SRFax?
As of Nov 12, 2026, neither InterFAX nor SRFax has a free plan. InterFAX has a free trial.
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.