Phaxio vs SRFax (2026): which should you pick?

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

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

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.

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.

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.

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.

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.

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.

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.

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.