Sinch Fax API vs Openfax Cloud Fax API

Sinch Fax API9.0Visit Openfax Cloud Fax API8.7Visit

Higher score Sinch Fax API #4 in Fax APIs 9.0/10 Paid ✓ 4 of 4 features Visit Sinch

vs

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

• Sinch Fax API fits best

  Businesses wanting a mature programmable fax service

• Openfax Cloud Fax API fits best

  Teams sending broadcasts or mail-merge faxes

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Side by side

Feature	Sinch Fax API 9.0/10 Visit ↗	Openfax Cloud Fax API 8.7/10 Visit ↗
At a glance
Editor score	9.0	8.7
Ranking	#4 in Fax APIs	#7 in Fax APIs
Best for	Businesses wanting a mature programmable fax service	Teams sending broadcasts or mail-merge faxes
Pricing model	Paid	Paid
Starting price	—	$0.03/unit usage-based
Free plan	—	—
Free trial	—	—
Deployment	Cloud	Cloud
Support	Tickets, Docs	Email, Live chat, Phone, Docs
Built for	Small business, Mid-market, Enterprise	Small business, Mid-market, Enterprise
Features Sinch 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	Supports both outbound transmission and inbound fax receipt REST API returns JSON and supports webhook notifications Tracks status and retries failed transmissions automatically	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 is available The product is API-only rather than a standalone fax application Pay-as-you-go pricing may require usage forecasting	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	Sinch Fax API is a REST-based cloud service for developers building fax workflows into business applications. It supports sending outbound faxes, receiving inbound faxes, retrieving fax status, and tracking completion. Webhook… 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

• Sinch Fax API — where it wins

  • Supports both outbound transmission and inbound fax receipt
  • REST API returns JSON and supports webhook notifications
  • Tracks status and retries failed transmissions automatically

  Where it doesn't

  • No free plan is available
  • The product is API-only rather than a standalone fax application
  • Pay-as-you-go pricing may require usage forecasting

• 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

• Sinch Fax API9.0/10 · Paid

  A mature REST fax API for adding inbound and outbound faxing to business applications.

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

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

  Visit OpenfaxFull verdict →