Telnyx Fax API vs Openfax Cloud Fax API

Telnyx Fax API9.4Visit Openfax Cloud Fax API8.7Visit

Higher score Telnyx Fax API #1 in Fax APIs 9.4/10 Paid ✓ 4 of 4 features Visit Telnyx

vs

Openfax Cloud Fax API #7 in Fax APIs 8.7/10 Paid ✓ 4 of 4 features Visit Openfax

• Telnyx Fax API fits best

  High-volume developers needing low per-page pricing

• Openfax Cloud Fax API fits best

  Teams sending broadcasts or mail-merge faxes

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Side by side

Feature	Telnyx Fax API 9.4/10 Visit ↗	Openfax Cloud Fax API 8.7/10 Visit ↗
At a glance
Editor score	9.4	8.7
Ranking	#1 in Fax APIs	#7 in Fax APIs
Best for	High-volume developers needing low per-page pricing	Teams sending broadcasts or mail-merge faxes
Pricing model	Paid	Paid
Starting price	$500/mo	$0.03/unit usage-based
Free plan	—	—
Free trial	—	—
Deployment	Cloud	Cloud
Support	Email, Live chat, Phone, Tickets, Docs · 24/7	Email, Live chat, Phone, Docs
Built for	Small business, Mid-market, Enterprise	Small business, Mid-market, Enterprise
Features Telnyx Fax API 4/4 · Openfax Cloud Fax API 4/4
Inbound faxing	✓	✓
Outbound faxing	✓	✓
Delivery tracking	✓	✓
Webhook events	✓	✓
Specs
API protocol	Rest	Not checked yet
Included pages	Not checked yet	Not checked yet
Our review
Pros	$0.007-per-page starting rate with automatic tier discounts REST support for sending, receiving, status events, and number provisioning T.38, G.711, resolution controls, and automatic error correction	Broadcasts faxes to multiple recipients from one submission Creates mail-merge fax broadcasts from DOCX templates Delivers results through reports, webhooks, email, or AWS S3
Cons	No free plan; usage requires a paid account SIP Trunking transmission usage is charged separately API-only access may not suit teams seeking a standalone fax interface	No recurring API plans are listed Pricing is specified for US-48 and Canada Account number and API key authentication may require developer setup
Our verdict	Telnyx Fax API is a programmable service for organizations that need to send, receive, and manage faxes through software rather than traditional fax infrastructure. It is suited to developers building fax workflows for healthcare, finance,… Read the review →	Openfax Cloud Fax API provides programmatic fax transmission for developers and organizations that need outbound sending, inbound fax numbers, delivery tracking, and automated result handling. Its scope covers single outbound fax… Read the review →

Strengths and trade-offs

• Telnyx Fax API — where it wins

  • $0.007-per-page starting rate with automatic tier discounts
  • REST support for sending, receiving, status events, and number provisioning
  • T.38, G.711, resolution controls, and automatic error correction

  Where it doesn't

  • No free plan; usage requires a paid account
  • SIP Trunking transmission usage is charged separately
  • API-only access may not suit teams seeking a standalone fax interface

• Openfax Cloud Fax API — where it wins

  • Broadcasts faxes to multiple recipients from one submission
  • Creates mail-merge fax broadcasts from DOCX templates
  • Delivers results through reports, webhooks, email, or AWS S3

  Where it doesn't

  • No recurring API plans are listed
  • Pricing is specified for US-48 and Canada
  • Account number and API key authentication may require developer setup

• Telnyx Fax API9.4/10 · Paid

  A low per-page REST fax API with inbound, outbound, tracking, and webhook support.

  Visit TelnyxFull verdict →
• Openfax Cloud Fax API8.7/10 · Paid

  A focused fax API for teams automating single sends, broadcasts, and inbound delivery.

  Visit OpenfaxFull verdict →