Ringup vs SingleFax

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

Ringup compared with SingleFax
Detail	Ringup	SingleFax
What it does	Identity and payments layer for AI voice agents	Send one-time faxes online from $0.99, pay only if delivered
Stage	Not given	Not given
Founded	Not given	Not given
Based in	US	US
Pricing model	Contact for pricing	Not given
Pricing	Not given	One-time fax: from $0.99 for up to 10 pages, then $0.08 per extra page (max 1,000 pages), pay only if delivered. 30-day fax number: $4.99 one-time payment. Lifetime Basic fax number: $97 one-time payment. Lifetime Pro fax number: $147 one-time payment. Standard Plan (monthly): $6.58/mo or $79/year (
Key features	Caller recognition by phone number with saved context Integration with 144+ payment processors Support for multiple voice platforms PCI Level 1 compliant card vault storage Carrier-verified SIM swap detection for security Direct settlement to merchant's processor REST API for custom voice stacks No card numbers read aloud on calls	Send faxes from browser, email, or mobile app Pay only if delivery succeeds Support for up to 1,000 pages per fax Timestamped delivery confirmation Searchable AI transcripts for received faxes HIPAA Secure workflow with signed BAA IRS form filing with carrier proof Chrome extension for PDF faxing
What makes it different	Phone number as payment identity eliminates card recitation Works with every merchant's existing processor without creating new accounts Funds never held or reconciled by Ringup	No account or subscription required for one-time faxes Pay only if fax delivers successfully Integrated IRS filing with official transmission proof Lifetime fax numbers with no monthly rental fees
Free plan	Not given	Not given
Open source	Not given	Not given
Platforms	Not given	Not given
Public API	Not given	Not given
Community votes	0	0
DR (Domain Rating by Ahrefs)	3 −1 (down) since last check	25 no change since last check
Trust Flow (Majestic)	0	1
Citation Flow (Majestic)	24	27
Referring domains (Majestic)	36	36

4 details filled in for both companies.

More alternatives to Ringup More alternatives to SingleFax