Fax API Review

Selecting the right fax API is not as straightforward a decision as one might like - there are a whole range of factors that need to be considered, some of which you may not even be aware of. We've put together a comprehensive list of them below in an effort to make your decision easier.

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OUTBOUND FAXING
FEATURES InterFAX Concord eFax Hello Fax Phaxio Right Fax Twilio
PCI DSS compliant for inbound and outbound fax Locally installed
HIPAA compliant for inbound and outbound fax Locally installed
GDPR-compliant Locally installed
Fax-viewing portal
Supported Interfaces for sending faxes
(SOAP, REST, SMTP, web)

(SOAP, SMTP)

(REST, SMTP, web)

(REST, SMTP, web)

(REST)

(SMTP, integration)

(REST)
Outbound fax storage
Maximum number of recipients per outbound fax 20,000 Unlimited 50 1 20 Unlimited 1
Unlimited number of documents per outbound fax
(limited to 10)

(limited to 1)
Faxable document types All commonly used Windows files All commonly used Windows files All commonly used Windows files All commonly used Windows files Limited list of file types All commonly used Windows files PDF
Outbound fax callback
Unlimited number of simultaneous outbound faxes
(one fax/sec)

(Based on number of channels connected)

(one fax/sec)
No restriction on outbound fax destinations
(Specific list of destinations)

(Specific list of destinations)

(Based on local phone service)

(US and Canada only)
Call attempts upon failure
Try before you buy
Allow outbound service without inbound number
Intelligent Routing
Throttle-free outbound faxes
Search outbound faxes via API
Allow submission of documents inline
INBOUND FAXING
FEATURES InterFAX Concord eFax Hello Fax Phaxio Right Fax Twilio
Fax-viewing portal
Supports multiple interfaces for receiving faxes
(SOAP, REST, SMTP)

(SOAP, SMTP)

(REST, SMTP)

(REST)

(REST)

(SMTP, integration)

(REST)
Unlimited storage duration of inbound faxes
Inbound fax callback
Try before you buy available
Search inbound faxes via API
Faxes received automatically
GENERAL FACTS
FEATURES InterFAX Concord eFax Hello Fax Phaxio Right Fax Twilio
Account management API
Pay as you go pricing
Helper libraries in different languages
API integrations with any account type
Unlimited scalability
Free API service
Developer documentation
Code samples

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