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 | |
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 | ✓ | ✗ | ✗ | ✗ | ✓ | ✗ | ✓ |