FAX API COMPARISON
Retarus vs iFax
iFax API offers seamless integration, flexible pricing, and compliance-ready infrastructure, while Retarus API is more enterprise-managed with heavier setup and onboarding.
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FAX API COMPARISON
iFax API offers seamless integration, flexible pricing, and compliance-ready infrastructure, while Retarus API is more enterprise-managed with heavier setup and onboarding.
Get a free Fax API test key to support integration, testing, and development before going live.
Experience 27/4 expert support through phone, email, and live chat. Talk with humans, not automated bots.
Seamlessly integrate with CRMs, enterprise platforms, and EMR/EHR systems (i.e., Cerner, Epic).
Side-by-Side Fax API Breakdown
iFax Fax API | Retarus Fax API | |
Pricing Transparency | $33/mo + ~$0.01/page volume faxing, includes SDKs and sandbox key | Quote-based enterprise pricing (not publicly disclosed) |
Uptime & Reliability | 99.999% uptime, with delivery tracking and reporting | 99.999% uptime, enterprise-grade redundant infrastructure |
Ease of Integration | REST API (JSON), quick start guides, sandbox access | REST, SOAP, SMTP, FTP with enterprise workflow options |
Scalability | High-volume faxing with automated workflows and logging | Built for large-scale enterprise and batch processing |
HIPAA & BAA | HIPAA-compliant with BAA included | HIPAA-compliant with certifications + BAA support |
Developer Support | Docs, SDKs, sandbox, plus 24/7 email/chat/phone with API specialists | Enterprise support team with solution engineers |
iFax starts at $33/month with the Pro plan, giving you access to its programmable Fax API and a free staging API key to test integration before going live. It also includes built-in compliance support plus integrations with EHRs and CRMs for seamless workflow connectivity.
Retarus uses a pay-per-use model, with pricing based on API usage and no fixed monthly or annual plans.
“It is cheaper compared to other providers, the ease of use and its design is very intuitive and easy to use. We personally take care of it a lot when it is necessary to solve a problem or unforeseen. I would highly recommend this to everyone.”
iFax delivers 99.999% API uptime, ensuring reliable, high-volume fax transmission with minimal disruption. It also supports performance testing so you can identify and avoid bottlenecks before going live.
Both Retarus and iFax provide strong reliability, backed by detailed documentation and continuous monitoring of API endpoints to maintain stable, optimized performance.
iFax meets HIPAA, GLBA, and SOC 2 compliance standards, protecting sensitive documents and PHI when sending and receiving faxes via the API. It also includes a Business Associate Agreement (BAA) at no extra cost.
Retarus’ HIPAA-compliant fax API delivers secure faxing with built-in access controls and authentication, helping protect systems from unauthorized access.
iFax’s Fax API scales with your business and integrates easily into existing systems. Use your preferred programming language, such as Python, PHP, or Java, to add fax capabilities to any workflow and scale fax volume up or down without infrastructure limits.
Retarus also supports high-volume faxing with high availability and capacity, giving you flexible bandwidth to handle demand as it changes.
iFax automatically logs fax history and verifies delivery for every API transmission, making it easy to track and monitor faxes from ERP and EHR systems while supporting compliance requirements.
Retarus provides audit trails for both successful and failed fax transmissions, though details on automatic logging for API or integrated workflows are not clearly specified.
Using a Fax API to send documents directly from existing software improves speed, efficiency, and workflow flexibility. In this iFax and Retarus comparison, choosing a secure, reliable provider gives your business a competitive edge.
With iFax, you can add online fax functionality to your CRMs, EHRs, and ERPs without building a new solution from scratch. Simple API integration is all it takes to start sending faxes seamlessly.
“Sending fax is seamlessly smooth using the iFAX, recipients are able to receive it quickly.”
“With features like email-to-fax, international faxing, and automation through API, iFax is not just convenient but also scalable for both personal and business use.“
iFax offers more transparent, flexible pricing designed for faster adoption, with clear plans and usage-based options that let businesses scale without long procurement delays or hidden infrastructure costs.
Retarus typically follows an enterprise pricing model with custom, quote-based contracts that depend on fax volume, infrastructure requirements, and deployment scope. Its custom pricing makes upfront cost estimation less transparent and better suited for large-scale enterprise procurement cycles.
iFax is designed for faster implementation with a developer-friendly Fax API, straightforward documentation, and quick-start authentication, enabling teams to integrate fax functionality into existing applications with minimal development effort.
Retarus integration generally requires a more complex setup, often involving enterprise onboarding, technical coordination, and deeper system configuration to align with its broader communication platform architecture.
Yes. iFax automatically logs all API-initiated fax transmissions, including delivery status, timestamps, and transmission metadata. These logs generate detailed fax reports that support audit trails, delivery monitoring, and compliance with HIPAA, GLBA, SOC 2, and GDPR requirements.
Absolutely. iFax provides a free API test key that allows developers to evaluate fax sending, receiving, and integration workflows in a staging environment before upgrading to a paid plan. Through this, your team can fully test the API without incurring any upfront costs or risks to your live system.