Teams leave Documo when they want cloud fax without a document platform around it, when the page allowance on a tier does not match their volume, or when they need a different compliance arrangement. Documo, formerly mFax, sells fax, secure messaging, document processing and e-signatures together, so fax-only buyers compare it with narrower services priced by page, by minute or by seat.
Short answer: Ranking order favours the challenger over the household name, so the best-known vendors begin at place 4 where the category allows it. For Documo users, the top three picks from our online fax services ranking are WestFax, Faxage and Fax.Plus. Pick WestFax if you want a signed BAA on every plan and fewer tiers. Every one of the 11 products below comes from Best Online Fax Services in 2026, with a note on how it departs from Documo.
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Pricing: Published tiers by page allowance with a trial; document processing priced per document
Established in: Not stated by the vendor
Built for: Healthcare practices and integrators wanting HIPAA on every plan and an API
Not for: Individuals who send a few faxes a month
01
Why buyers look past Documo
01
Three tiers, each with a hard page pool
Documo lists Solo at 300 pages a month, Business at 1,500 and Enterprise at 6,000, with overage at $0.15, $0.09 and $0.07 a page. An office whose volume sits just above a pool pays the overage rate or climbs a tier, and extra users and numbers cost $3.00 each a month on top.
02
API and single sign-on sit higher up
The entry tier is one user and one number. Developer APIs start at Business, and single sign-on is described only on the Enterprise tier. A small team that wants to connect fax to its own software, or a larger one that wants SSO without 6,000 pages, has to buy the step above the need.
03
The platform is wider than a fax inbox
The pricing page puts fax beside direct secure messaging, document processing and EHR integration, with the processing priced per document by quote. Buyers who only want to send and receive pages can end up reading a healthcare workflow pitch, and may prefer a service whose whole page is about faxing.
your staff already use RingCentral for calls and want fax inside it
#11
03
What each one does differently
1
WestFax
United States · Published
WestFax answers the compliance question first: it says every plan carries a signed business associate agreement, so there is no tier to climb for that. It publishes two plans, Solo and Team, and a quoted Enterprise tier. API access is reserved for Enterprise, international sending costs extra and each number carries a one-time provisioning or porting fee.
Switch from Documo if you want a signed BAA on every plan and fewer tiers.
Faxage, run from Denver by EC Data Systems, prints its entire plan table, from a lite plan with no included minutes up to carrier lines. Web faxing, email-to-fax and the API come with every account. Usage is counted in transmission minutes rather than pages, and each line has a setup charge, so slow or long faxes weigh on the bill.
Switch from Documo if you want the API on every account and accept minute-based billing.
Fax.Plus comes from Alohi in Geneva and lets you send a first test on a free plan of 10 pages in total, then choose among four published tiers with an annual discount. Number porting needs Premium or higher, and HIPAA with a BAA plus data residency are limited to Enterprise, so regulated teams must plan for the top tier.
Switch from Documo if you want to trial a Swiss-run service before paying.
A UK-registered company, Amplify Ventures Ltd, operates iFax with an office in San Francisco. Its pricing page states there are no overage fees. The Basic plan only sends, so inbound fax means starting at Plus, which includes one number and handles both directions. Pro and Enterprise are priced by volume and the page text gives no figures.
Switch from Documo if you want no overage fees and a UK-registered operator.
faxB2B has a single Team plan at $15 per seat a month, pooling 150 sent pages per seat with received faxes free and $0.08 for each extra sent page. It fingerprints every delivered fax with a SHA-256 hash on a PDF receipt. The terms exclude customers in the EEA and UK and say no business associate agreement is signed.
Switch from Documo if you are a US office that wants per-seat pricing and proof of delivery.
FaxZero is one web form from Savetz Publishing, with no account, inbox or numbers to manage. A free fax carries up to 3 pages and branded cover, with 5 free faxes a day to the United States and Canada, while a paid single fax allows 25 pages without branding. Its pages mention no team or healthcare features.
Switch from Documo if you fax once in a while and need no inbox.
Telnyx sells fax as an API with a per-page rate in each direction and no platform fee. Transmission rides on SIP trunk usage, and every number has a monthly charge. The cost model suits a product team that wants fax inside its own software; staff who expect a web inbox or email-to-fax would have to build that layer themselves.
Switch from Documo if you are a developer who wants pay-per-page fax with no platform fee.
Phaxio, presented as Phaxio by Sinch, prints its rates for the United States, Canada and other countries on one short page, charging per page sent or received plus a monthly fee per number. Discounts apply automatically from 50,000 pages a month. Its pages show an API and documentation, not a team console or shared inbox.
Switch from Documo if you want a short, public per-page rate card for API traffic.
InterFAX belongs to Upland Software in Austin and offers monthly subscriptions, prepaid page packages and custom enterprise bundles, with trial credits for testing. Entry plans include a local number. Pages up to a minute count as one and longer ones are billed in six-second steps, so a slow line can raise the invoice.
Switch from Documo if you prefer prepaid page packages with a local number included.
Nextiva vFax sells two page pools, shared between sent and received faxes, and does not count failed transmissions against the pool. The entry price is low for a light office. A HIPAA edition exists but is priced only through a conversation, and the product page lists a portal and email delivery without naming an API.
Switch from Documo if your office sends few faxes and already buys from Nextiva.
RingCentral includes fax in its RingEX phone subscription, so there is no separate fax line item. Attachments reach 20 MB, one fax can go to up to 50 recipients, and email-to-fax uses an rcfax.com address. The arrangement makes sense when staff already use RingCentral telephony; a fax-only buyer pays for a phone system.
Switch from Documo if your staff already use RingCentral for calls and want fax inside it.
You need a signed BAA without moving to a top tier
WestFax: The vendor states a signed business associate agreement on every plan, from Solo upward.
02
You want to send a first test fax before paying
Fax.Plus: A free plan gives 10 pages in total, and the service is run from Geneva.
03
You build fax into your own software
Telnyx Fax: Pricing is per page in either direction with no platform fee, though SIP usage and numbers are billed separately.
04
Your staff already make calls through RingCentral
RingCentral Fax: Fax sits inside the RingEX subscription, with attachments up to 20 MB and up to 50 recipients.
05
You fax a form once in a while
FaxZero: A free fax allows 3 pages with branding, and a paid single fax allows 25 pages.
04
When Documo is still the right choice
Documo remains a sound pick for a healthcare organisation that wants fax, document classification and EHR connections from one supplier. HIPAA is stated on every plan, the tiers and overage rates are public, and a documented API starts at Business. If you use or plan to use its document processing, splitting the platform across vendors would add work rather than remove it.
05
What moving off Documo involves
01
Fax numbers need porting, not recreating
Referral partners and clinics have your number on file. Ask the new provider whether it ports numbers, what it charges and how long it takes, and keep Documo active until the port completes. Some services restrict porting to higher tiers or add a one-time fee.
02
Compliance paperwork starts again
A new supplier means a new business associate agreement where one is needed, a fresh security review and updated records of where faxes are stored. Confirm which plan carries the agreement before you compare prices, as several services limit it to a top tier or exclude it.
03
Integrations and archives have to be rebuilt
Check whether EHR routing, API calls or processing workflows rely on Documo features. Export the fax history you must retain before cancelling, and test one inbound and one outbound fax with a partner before you switch the main number.
06
Questions about replacing Documo
6 answers
How much does Documo cost?
Its pricing page lists Solo at $25 a month billed annually, Business at $100 monthly or $80 billed annually, and Enterprise at $300 monthly or $240 billed annually. Document processing and the custom platform are quoted, so ask for a figure before budgeting.
Is Documo the same as mFax?
Yes. Documo says mFax, mSign and mDrive were unified under one brand in 2025, and that the services you used before carry on under the new name. The company says it was founded in 2017.
Which alternatives include a signed BAA on every plan?
WestFax states that every plan carries a signed business associate agreement. Fax.Plus limits HIPAA with a BAA to Enterprise, Nextiva sells a HIPAA edition by contact, and faxB2B says it signs no BAAs. Confirm the current terms with the vendor.
What is the cheapest way to send an occasional fax?
FaxZero allows a free fax of up to 3 pages with branding, and Fax.Plus offers a free plan of 10 pages in total. For regular volume a paid plan is more practical, because both free options stop quickly.
Which services suit developers who want a fax API?
Telnyx and Phaxio both bill per page for API traffic. Faxage includes the API in every account, and Documo includes it from Business. Telnyx and Phaxio pages show no shared inbox, so staff-facing use needs extra work.
Do all alternatives count pages the same way?
No. Faxage meters minutes, InterFAX counts pages in six-second steps beyond a minute, Documo and Nextiva use page pools, and faxB2B pools sent pages per seat. Compare using your own typical fax length.
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Sources
Checked 8 November 2026
Documo pricing: tier prices, page pools, overage rates, HIPAA on every plan, API and SSO placement.
Documo mFax rebrand: mFax, mSign and mDrive unified as Documo, founding year 2017.
WestFax: published plans, BAA on every plan, number fees.
Faxage: plan table, minute metering, setup charge.
Fax.Plus: free 10 pages, tiers, HIPAA and residency on Enterprise.
Founder of The Knowledge Engineers and of 2 Steps Ahead, an AI search visibility agency. Editorially responsible for every page on this site; research and drafting are AI-assisted.
Sebastiaan Smits wrote and checked this page, most recently on 8 November 2026. See how we review.
