InterFAX vs Phaxio (2026): which should you pick?
As of Nov 12, 2026, InterFAX grades higher than Phaxio: 2.4 against 1.8 out of 4.0.
Checked Nov 12, 2026 · graded Nov 12, 2026 by ToolGPA
InterFAX grades higher on the free plan, features and ease of use. Phaxio grades higher on value for money. They get the same grade on 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 Phaxio if
- Fits if you're a developer who needs to send faxes from your own software
- Works for low-volume senders who don't want a monthly plan
Look elsewhere if
- Not for you if you don't write code, because the main way in is the API
- Skip it if you want a free trial, as there isn't one
- Watch out: the API allows one request per second per account unless Phaxio raises it
- Pricey if you send a lot: volume rates only start at 50,000 pages a month
How we grade them
| 2.4GPAInterFAXFair | 1.8GPAPhaxioWeak | |
|---|---|---|
| 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. | B7 cents a page in the US and Canada with a $10 minimum top-up and no monthly fee. A receiving number is $2 a month. Light senders pay far less than a plan; volume rates start at 50,000 pages. |
| 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. You start by topping up $10. |
| 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. | CA JSON fax API with batching, retries, callbacks and metadata, plus numbers for receiving. It does that job fully, and it is a smaller job than a full fax service. |
| Ease of use | CNo store rating on record. The pitch is built around developers and IT teams wiring fax into other software. | DNo store rating on record. You need to write code to send a fax, and a person with no developer won't get far. |
| 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 console plus the API, which is the product. Phaxio says it can serve HIPAA workloads if its guidelines are followed. No phone or desktop app. |
| Best for | fax with an API and compliance papers | adding fax to an app by API |
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 Phaxio. How we grade
Where they differ
- InterFAX also covers workflow automation.
At a glance
| InterFAX | Phaxio | |
|---|---|---|
| Pricing | Free trial | Paid |
| Starts at | $9.95 per month for 100 inbound and 100 outbound pages, billed monthly | $10 minimum top-up, then 7 cents per page in the US and Canada |
| 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. | Phaxio |
| Price read from | uplandsoftware.com | phaxio.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.
Phaxio
- Pricing is per page only: 7 cents in the US and Canada, 10 cents international, and 1 cent per fax received for the caller name add-on.
- Volume rates start at 50,000 pages a month: 5 cents, then 4 cents at 100,000.
- The API allows one request per second per account unless Phaxio raises it.
- Phaxio says it can be used for HIPAA workloads if its guidelines are followed, and it supports docx, pdf, tif, jpg, txt, html and png.
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.
Phaxio
- JSON fax API
- Send a fax with one call that takes a number and a file, or post a URL or a string of HTML to be rendered and sent.
- Batching and retries
- Batching and collision avoidance keep faxes from hitting a busy number, and retries for busy lines and other errors are configurable.
- Callbacks and metadata
- Failed callbacks are retried for three days, and each outgoing fax can carry metadata such as an order number or patient record number.
- Numbers for receiving
- Receive faxes on a US or Canadian number at $2 a month, or use the shared Phaxio number with a PhaxCode on the document.
- Dashboard
- A web console lists faxes, provisions numbers and lets you trigger a callback by hand.
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.
Phaxio
Pay as you go$10
one-time top-up, used as you go
No monthly fee. 7 cents a page in the US and Canada, 10 cents elsewhere; funds can recharge automatically.
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.
Phaxio
- Other savings
Volume discounts above 50,000 pages a month
US and Canada pages drop to 5 cents at 50,000 a month and 4 cents at 100,000; international drops to 8 and then 7 cents.
Common questions
Which is cheaper, InterFAX or Phaxio?
As of Nov 12, 2026, InterFAX starts at $9.95 per month for 100 inbound and 100 outbound pages, billed monthly, and Phaxio starts at $10 minimum top-up, then 7 cents per page in the US and Canada.
Which has a free plan, InterFAX or Phaxio?
As of Nov 12, 2026, neither InterFAX nor Phaxio 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.