Concord Fax API vs SingleFax API

Concord Fax API

Figure	Concord Fax API	SingleFax API
Price from	—	$6.58/mo
Free plan	—	—
Free trial	—	—
Open source	—	—
Web	Yes	Yes
API	Yes	Yes
Plans published	1	4
Spec score · Fax APIs	8.2 (#8)	7.0 (#24)
Headquarters	Seattle, Washington, USA	The company lists its address as 30 N Gould St Ste R, Sheridan, WY 82801, USA.
Product	Concord offers APIs for fax and document automation through its Developer Portal.	SingleFax provides a REST API and CLI for sending faxes from a backend using an API key and prepaid credits.
Security	Concord states that fax communications are encrypted in transit over TLS or Secure HTTP and lists encryption at rest and AES 256-bit encryption.	The maker's HIPAA page describes TLS 1.3 in transit, AES-256 at rest, isolated PHI storage, and automated media purge with an audit trail.
Support	The Developer Portal offers support, and its login page lists Concord Support by phone at +1 (206) 441.3346 option 2 and by email at [email protected].	The About page lists [email protected] as support and says the same mailbox handles product questions, partnerships, and abuse reports.

Concord Fax API has no write-up on Specifiction yet; its figures are above.

SingleFax API has no write-up on Specifiction yet; its figures are above.