Top 10 Retarus Alternatives For Your Business

Introduction

How businesses communicate in today’s market is vastly different from that of even just a few years ago. What we’d previously used for secure messaging, delivering faxes, or sending transactional email and pushes is now a means of intelligent, two-way engagement. Today’s businesses demand communication platforms that do more than merely automate workflows or enable two-way conversations.

Retarus has long been recognized as a titan in enterprise cloud fax, secure email services, and transactional messaging. Many Fortune 500 companies rely on Retarus for its reliability, compliance posture, and global delivery capabilities.

But modern businesses require more than a secure “messaging pipe.” They need platforms that integrate security, automation, AI integration, omnichannel engagement, and usability. This is why many businesses are searching for a Retarus alternative, a Retarus replacement, or solutions similar to Retarus but more flexible.

This guide reviews the top 10 Retarus alternatives and provides insight into companies that are pairing enterprise-grade security with modern automation, clear-cut pricing, and rapid deployment, many of which are better than Retarus for today’s operational needs.

What is Retarus?

Retarus (Based in Germany) is a large organization’s global information logistics provider for cloud-based business integration.  It offers secure email services with encryption and threat protection, high-performance cloud fax to replace physical fax servers, reliable SMS messaging for alerts and notifications, and transactional communication for automating the delivery of critical business documents such as invoices and order confirmations. The company is well established in the most heavily regulated sectors, including healthcare, finance, insurance, and logistics, as well as government, and is known for its robust compliance standards, in-country data processing, and enterprise-grade pricing.

Retarus Features:

• Enterprise Cloud Fax: Retarus delivers a hardware-free high-volume fax infrastructure.
• Audit Trails: Detailed delivery logs for every single transmission, ensuring legal peace of mind.
• Scale: Processing of thousands of simultaneous faxes without any lag.
• Threat Protection: Sophisticated filtering for phishing, malware, and ransomware.
• Continuity: A “standby” email system that activates in case your corporate server goes down.
• Worldwide Coverage: Hundreds of direct connections with mobile carriers around the world for high delivery rates.

Retarus Pros:

• Unmatched Security: Their security is amongst the best in the world, so this company is a good bet for banks and hospitals.
• Global Infrastructure: They maintain data centers in the US, Asia, and Europe; they provide high-quality global message delivery.
• Complex Needs Handling: They do well to handle very complex and high-volume workflows for multi-national businesses.
• Reliable: Established reputation for 99.9% uptime and carrier-grade network.

Retarus Cons:

• Obscure Pricing: Retarus does not list its pricing. There isn’t a price list on their website; it’s all pretty much quote-driven.
• High Cost: The Retarus cost is often prohibitive for SMBs and mid-market companies.
• Slow Onboarding: Setting up and integrating Retarus into existing systems can involve long sales cycles and complex implementation phases.
• UI is Complicated: The admin dashboards and workflows can feel ‘legacy’ and too technical for non-IT personnel.
• Limited Agility: Growth-stage companies often find the platform lacks the “plug-and-play” flexibility needed for rapid scaling.

Retarus Pricing:

As mentioned, Retarus pricing is highly customized. It generally follows an enterprise-premium model where the final Retarus cost depends on:

• Total Volume: Page counts for fax, and message counts for SMS.
• Channel Mix: The ratio of which services (Fax vs. Email vs. SMS) you use.
• Compliance Add-ons: Dedicated infrastructure or specific regional data residency requirements.

It’s a model that works for Fortune 500+ organizations with unlimited budgets, but it can quickly become a non-starter if you’re an organization seeking more of a Retarus alternative that can offer straightforward, predictable billing.

Retarus Integrations:

• CRM Systems: Salesforce, SAP, and Microsoft Dynamics.
• ERP Integration: Tight integration with SAP for automatic document submission.
• Hospital Systems: Integration with dominant EHR/EMR systems such as Epic and Cerner.
• APIs: A variety of REST and SOAP APIs for custom workflow automation.
• SSO: Integrates with SAML and other identity management protocols to provide secure access.

Retarus Support Channels:

• Translators Dedicated Account Managers: Access to the exclusive account manager who no longer needs to be chased (for our Platinum/ Gold customers).
• Support Portal: Ticket-based system for non-critical issues.
• 24/7 Phone Support: Available for critical system outages.
• Implementation Supported: Professional services are available to assist with initial configuration.

Retarus Ratings:

4.1/5

Retarus Reviews:

“Extremely reliable for high-volume fax and email delivery, but onboarding took longer than expected.”

“Great security and compliance, though pricing is clearly aimed at large enterprises.”

Source: G2

Why Do Businesses Seek a Retarus Alternative?

Cost

Today’s economy has made businesses all the more conscious of their communication spend, and pricing needs to align with actual usage and not penalize them for not needing features other businesses may have. Retarus’ enterprise-first pricing often makes it less accessible for SMBs and mid-market organizations.

Rapid Deployment

In the high-paced world we live in, time is precious, and organizations now demand their communication systems to be implemented in days as opposed to months. Long setup costs and lead times result in time to productivity and a business slowdown.

AI & Conversations

Enterprises now require AI-driven conversational engagements, instead of being push message delivery systems that provide no intelligence behind the interactions they route.

Omnichannel Requirements

Organizations are looking for a single dashboard to handle fax, SMS, and voice communications, consolidate the number of tools being used, and simplify operations.

Transparency

Businesses are moving away from “call for a quote” models, where prices are complicated to find, preferring instead transparent pricing that allows for better budgeting and quicker purchase decisions.

Ease of Use

Middle market companies don’t want systems that their office manager or operations team has to constantly call the IT guy to figure out how something isn’t working.

What Features to Look for in a Retarus Alternative?

Multi-Channel Communication

An effective alternative should offer SMS, voice, email, and fax all on one platform so that your team can work together to handle all business communication with ease.

Automation & AI

Search for intelligent features like autoresponders, workflow automation, and smart routing, which minimize the amount of manual work required and speed up response times.

Compliance Readiness

Out-of-the-box support for HIPAA, GDPR, audit logs, and secure data handling are a must-have in business-critical and regulated communications.

Flexibility of Integration

The system needs to integrate out of the box with major systems such as CRMs (Salesforce, HubSpot) and EHRs so that the data can flow seamlessly without any manual intervention.

Clear Scalability

Pricing grows predictably as scale increases, allowing for growth without punishing greater communication.

Mobile Accessibility

Accessing faxes, messages, and conversations from the mobile, keeping the teams connected on the move in an efficient manner, which also leads to faster response times as well as flexible working.

10 Best Retarus Alternatives

1. Emitrr 
2. eFax
3. WestFax
4. SRFax
5. iFax
6. Documo (mFax)
7. RingCentral Fax
8. Nextiva vFax
9. InterFAX
10. Concord Fax

1. Emitrr – Best Retarus Alternative for Modern Engagement

Overview:

Emitrr is the best-rated alternative to Retarus and provides an advanced digital fax solution that is combined with a comprehensive customer engagement platform. Instead of Retarus’ delivery-first architecture, Emitrr consolidates fax, two-way SMS, AI-powered automation, and VoIP calling inside a single, simple-to-use dashboard. It’s a perfect Retarus alternative for enterprises that require canned security but with faster time to value, automation, and consolidated workflows.

Emitrr Key Features:

• Inbound/Outbound Faxing: Send and receive faxes digitally using the web, email , or device with no hardware required.
• Fax-to-Email/SMS: Route incoming faxes directly to email and send SMS alerts for rapid response.
• AI Voice & SMS Agents: Deal with missed calls, FAQs, confirmations, and routine follow-up automatically.
• Multi-Addressees Broadcast: Deliver the same message to a number of addressees or even an entire list, in one go.
• Professional Templates: Custom-branded cover sheets maintain a professional, compliant communication trail.

Emitrr Pros:

• Fax, SMS, VoIP, and automation as one platform.
• Solid HIPAA compliance with AI-powered workflow automation.
• Intuitive, mobile-first dashboard for non-technical teams.
• Simple, transparent pricing that scales predictably.

Emitrr Cons:

• Some of the advanced features are still in process and will be live soon.

Emitrr Pricing:

• Standard: ~$25/month.
• Professional: ~$35/month.

Note: Generally included in packages with no per-page overages.

Emitrr Integrations:

Salesforce, HubSpot, AthenaHealth, Denticon (by PlanetDDS), Mailchimp, Zapier , and even bigger EMR or EHR systems.

Emitrr Support Channels:

Live chat, email, telephone, and a rich knowledge base.

Emitrr Ratings:

4.8/5

Emitrr Reviews:

“Very easy to implement, and support is excellent. It’s the best alternative to Retarus with far more automation.”

“We consolidated our fax and SMS into Emitrr and saved thousands. The AI features are a game changer for our front desk.”

Source: G2

2. eFax

Overview:

eFax is amongst the most popular online fax services in the world with cloud-based, device-agnostic document delivery. Mostly, it is about replacing legacy fax machines with email and mobile-integrated fax workflows. Although eFax is good for sending documents across, it doesn’t touch upon deeper automation and engagement features. It acts as a Retarus alternative for companies that only need the simplest faxing services.

eFax Key Features:

• Digital Signatures: Sign and digitize your documents.
• Fax App for Phone: Fax from the palm of your hand.
• Large File Sharing: Transfer big files with no restrictions; size up to 3GB.

eFax Pros:

• Well-established brand with proven reliability.
• Easy mobile experience for off-site or field workers.

eFax Cons:

• Customer service response times can vary greatly.
• Pricing jumps quickly with larger amounts of faxes.

eFax Pricing:

Starts at ~$18.95/month.

eFax Integrations:

Microsoft Office, Google Drive.

eFax Support Channels:

Email, Phone.

eFax Ratings:

4.2/5

eFax Reviews:

“Reliable for basic faxing, but the interface feels a bit dated compared to modern apps.”

 “Good for occasional faxes, but watch out for the overage fees.”

Source: G2

3. WestFax

Overview:

WestFax is a cloud fax service that was developed to cater to healthcare settings where safety and reliability are of primary concern. It provides HIPAA-compliant faxing and a robust API that can be used to integrate into EHR and referral workflows. WestFax offers developers a more focused experience than Retarus; it’s fax-or-bust. It’s perfect for healthcare providers looking to have a secure, automated fax service.

WestFax Key Features:

• HIPAA-Compliant API: Secure faxing software for faxes sent and received via healthcare organizations.
• Print-to-Fax Drivers: Let you fax from any Windows program.
• Broadcast Faxing: Send a fax to 100 recipients with one click.

WestFax Pros:

• Great technical documentation and API stability.
• Good fit with the needs of healthcare regulatory compliance.

WestFax Cons:

• Limited functionality other than sending faxes or messages.

WestFax Pricing:

Usage-based (Quote required for enterprise).

WestFax Integrations:

Epic, Cerner, Salesforce.

WestFax Support Channels:

Email, Phone, Developer Portal.

WestFax Ratings:

4.7/5

WestFax Reviews:

“The API integration was seamless. Perfect for our patient referral system.” 

“Great support team that actually understands the healthcare space.”

Source: Capterra

4. SRFax

Overview:

SRFax provides a reliable high-resolution fax service with a focus on security and compliance. Fax quality, encryption, and auditability are more important than automation or omnichannel.” As an alternative to Retarus, SRFax is best for businesses looking for a reliable faxing solution that promises no complications. Its feature set is intentionally limited and fax-oriented.

SRFax Key Features:

• High-Level Encryption: Ensure your confidential data transmitted across networks is kept from snooping and interception.
• Extensive Activity Logs: Total transparency into the history of faxes sent.
• International Faxing: Allows you to send documents worldwide.

SRFax Pros:

• Excellent fax quality for anything complicated or detailed.
• Prices well for mid-volume fax users.

SRFax Cons:

• No mobile application.
• The user interface feels outdated.

SRFax Pricing:

Subscription plans start at around $11/month.

SRFax Integrations:

Limited to Email-to-Fax.

SRFax Support Channels:

Email, Knowledge Base.

SRFax Ratings:

4.0/5

SRFax Reviews:

“Security is top-notch, but I wish they had a modern dashboard.” 

“Reliable and HIPAA compliant. It does exactly what it says on the tin.”

Source: G2

5. iFax

Overview:

SRFax is a regulatory-compliant, secure fax service that offers you the ability to easily send and receive faxes electronically for high-resolution document delivery to your recipients or anytime you can’t get to an actual fax machine. It values fax quality, encryption, and auditability at the expense of automation or omnichannel engagement. As an alternative to Retarus, SRFax is best suited for businesses seeking reliable faxing without unnecessary bells and whistles. Its feature set is deliberately limited and fax-first.

iFax Key Features:

• Cloud Storage: Compatible with Dropbox, Box, and Google Drive.
• Built-in Scanner: Scan and share directly from mobile devices.
• Pay-as-You-Go Options: Flexible usage-based pricing.

iFax Pros:

• Outstanding mobile user experience.
• Simple, modern UI with easy usage.

iFax Cons:

• Not meant to be used for high-volume transactional messaging.

iFax Pricing:

Freemium business model: Paid plans begin at ~$8.33 per/month.

iFax Integrations:

Google Drive, Zapier.

iFax Support Channels:

Email, In-app chat.

iFax Ratings:

4.6/5

iFax Reviews:

“I can send a fax from my phone in 30 seconds. Perfect for my real estate business.”

“Cleanest interface of any fax app I’ve used.”

Source: Capterra

6. Documo (mFax)

Overview:

Documo’s mFax modernizes fax workflows with a collaborative, cloud-native interface that feels more like a messaging app than a legacy fax system. It offers secure, HIPAA-compliant faxing with smart routing and team-based inboxes. Compared to Retarus, mFax focuses more on usability and collaboration. It is a strong option for mid-market healthcare and professional services teams.

Documo (mFax) Key Features:

• Smart Routing: Route faxes to the right team or user, automatically.
• Group Queues: Shared inboxes for team fax processing.
• Cloud Storage (mDrive): Material-related storage and retrieval.

Documo (mFax) Pros:

• Excellent collaboration and team visibility.
• Strong compliance and security posture.

Documo (mFax) Cons:

• More expensive than standard fax-only services

Documo (mFax) Pricing:

Starts at ~$15/month for individuals.

Documo (mFax) Integrations:

Slack, Microsoft Teams, Salesforce.

Documo (mFax) Support Channels:

24/7 Live Support.

Documo (mFax) Ratings:

4.7/5

Documo (mFax) Reviews:

“The team folders make managing incoming patient records so much easier.” 

“Excellent customer service. They helped us migrate 20 numbers in a day.”

Source:G2 

7. RingCentral Fax

Overview:

Like eFax, RingCentral Fax is part of a larger unified communications platform from RingCentral that includes not only faxing, but also voice, video, and messaging. It places fax as one element of a broader UCaaS environment instead of just another tool. When contrasted with Retarus, RingCentral provides a wider unified communications scope and less focus on fax workflows. It’s ideal for companies that are consolidating vendors across channels.

RingCentral Fax Key Features:

• Fax Within App: Fax on-the-go distribute, receive and replicate faxes out of your telephone or pill.
• AI Call Summaries: AI-powered call insights.
• Global Phone System: Worldwide communication support.

RingCentral Fax Pros:

• Comprehensive all-in-one communications platform.
• Enterprise-grade uptime and reliability.

RingCentral Fax Cons:

• The platform can feel complex and heavy.
• Costly if fax is the only requirement.

RingCentral Fax Pricing:

Subscription bundles (approx. $20-$40/user/month).

RingCentral Fax Integrations:

300+ apps, including Microsoft 365.

RingCentral Fax Support Channels:

24/7 Phone, Chat, Community.

RingCentral Fax Ratings:

4/5

RingCentral Fax Reviews:

“Good for big companies, but can be overkill for a small office.”

“Integration with our CRM is perfect, but the support wait times are long.”

Source: G2

8. Nextiva vFax

Overview:

Nextiva vFax delivers cloud-based faxing designed to replace traditional fax lines with minimal disruption. It emphasizes ease of setup, reliability, and strong customer support. While similar to Retarus in delivery reliability, Nextiva focuses more on usability than enterprise complexity. It is ideal for businesses modernizing legacy fax infrastructure.

Nextiva vFax Key Features:

• SMS Fax Alerts: Get instant SMS alerts for incoming faxes.
• Fax Adapter: Connects traditional fax machines to the cloud.
• Online Fax Console: Easy web management.

Nextiva vFax Pros:

• Extremely quick and easy setup.
• Strong reputation for customer service.

Nextiva vFax Cons:

• Limited international faxing in lower-tier plans.

Nextiva Pricing:

Starts at ~$7.95/month.

Nextiva vFax Integrations:

HubSpot, Salesforce.

Nextiva vFax Support Channels:

Phone, Live Chat, Email.

Nextiva vFax Ratings:

4.4/5

Nextiva vFax Reviews:

“The setup was so easy. We were up and running in 10 minutes.” 

“Support is actually helpful and speaks clear English.”

Source: Capterra

9. InterFAX

Overview:

InterFAX is a fax service focusing on developer-centric usage of programmatic and high-volume faxing. It has robust APIs for organizations looking to build faxing into their own custom solutions and workflows. Unlike Retarus, which takes usability for business users as its top priority, InterFAX is designed with flexibility for the technical team in mind. The best fit for software-oriented companies.

InterFAX Key Features:

• Extensive APIs: Deep customization options.
• High-Volume Faxing: Built for scale.
• Email-to-Fax: Bulk document sending.

InterFAX Pros:

• Highly stable and scalable infrastructure.
• Strong global fax delivery.

InterFAX Cons:

• Not user-friendly for non-technical staff.

InterFAX Pricing:

Tiered usage plans.

InterFAX Integrations:

Developer APIs, SMTP.

InterFAX Support Channels:

Email, Developer Forums.

InterFAX Ratings:

3.8/5

InterFAX Reviews:

“A developer’s dream for faxing, but my office staff can’t use it.”

“Robust and never goes down.”

Source: G2

10. Concord Fax

Overview:

Concord Fax is a high-security enterprise fax solution designed for organizations with strict regulatory and data protection requirements. It supports hybrid cloud deployments and advanced compliance standards such as PCI-DSS. Compared to Retarus, Concord emphasizes maximum security and delivery assurance. It is widely adopted among large hospitals, financial institutions, and government agencies.

Concord Fax Key Features:

• PCI-DSS Compliance: High security standards.
• Hybrid Cloud Choices: Deployment versatility.
• Real-Time Reporting: Detailed delivery analytics.

Concord Fax Pros:

• Extremely high delivery success rates.
• Industry-leading security certifications.

Concord Fax Cons:

• Very expensive.
• Requires dedicated administrative oversight.

Concord Fax Pricing:

Enterprise custom quotes.

Concord Fax Integrations:

SAP, Oracle.

Concord Fax Support Channels:

24/7 Enterprise Support.

Concord Fax Ratings:

4.2/5

Concord Fax Reviews:

“If you have a million faxes a month, this is the only tool that works.” 

“Very secure, but the cost is astronomical.”

Source: Capterra

Why is Emitrr the Best Retarus Alternative?

Whereas Retarus is built for the secure message delivery “pipe,” Emitrr is engineered for what businesses require: smart, two-way, outcome-driven communication.

From Delivery to Engagement

Retarus is constructed as a messaging pipeline; it moves a message from A to B. Emitrr transmutes communication into interaction. In addition to two-way SMS, voice calls, and automated follow-ups, conversational workflows are all supported from the same platform!

Unified Channels, Not Silos

Rather than juggling fax, SMS, and voice as individual systems, Emitrr combines them under one dashboard. This eliminates sprawl and significantly reduces response times on your team.

AI-Powered Automation (Not Just APIs)

Emitrr presents AI voice and SMS live agents which work as digital staff managing call misses, FAQs, appointment scheduling, confirmations & reminders. You’re not just receiving a delivery report; you’re getting something done.

Faster Onboarding, Lower Friction

While a Retarus competitor could take weeks or months to implement, Emitrr delivers plug-and-play onboarding. The vast majority of our teams are up and running in days, not quarters.

Transparent, Growth-Friendly Pricing

Emitrr removes the uncertainty of the Retarus pricing model with clear, scalable plans. It is accessible for SMBs and mid-market firms while still providing the power needed by growth-stage enterprises.

Which industries are catered to by Emitrr?

Healthcare

Emitrr is designed for healthcare communication workflows, combining HIPAA-compliant virtual faxing with secure texting, audit-friendly logs, and automated reminders/confirmations to reduce no-shows and speed up document exchange (records, referrals, prescriptions, billing). It’s especially valuable for multi-location clinics that need consistent, compliant communication and a centralized inbox for staff.

Legal

Law firms and legal departments benefit from secure document exchange plus traceability, sending/receiving sensitive documents via fax, coordinating updates through SMS/voice, and maintaining accountability with logs and role-based access. This helps with contracts, notices, and time-sensitive filings where proof of transmission and a clear communication trail matter.

Real Estate

Real estate teams can send and receive contracts/addenda via digital fax while keeping clients informed with automated SMS updates (appointments, document requests, signing reminders). The unified communication approach is useful when multiple parties (buyers, sellers, lenders, title offices) need fast coordination and consistent follow-ups.

Education

Schools, colleges, and training organizations can securely distribute documents, run bulk notifications, and handle two-way texting for urgent updates (closures, scheduling changes, compliance notices). Centralized messaging helps staff communicate faster during time-sensitive situations while maintaining control over access and records.

Home Services

Home service businesses (HVAC, plumbing, cleaning, pest control) use Emitrr to streamline high-volume customer communication, appointment booking, confirmations, missed-call text-back, job updates, and invoicing follow-ups, so office staff can manage calls and messages from one place and reduce missed leads.

Frequently Asked Questions

Conclusion

While Retarus remains a powerhouse for “delivery-only” enterprise needs, the business landscape in today’s world demands more. It requires engagement, intelligence, and agility. If you find yourself frustrated by high costs, a complex UI, or a lack of automation, it’s time to move.

Emitrr is the best solution if you’re looking to transform your communication channel into a growth engine. Book a demo today.