Retarus is an enterprise cloud fax provider built for large, multinational, compliance-heavy organizations. It runs six data centers, holds SOC 1, SOC 2, ISO 27001, and HITRUST e1 certification alongside HIPAA, FERPA, and GDPR compliance, and offers native REST and SMTP APIs plus pre-built certified SAP connectors. It does not publish pricing. For a global enterprise with SAP in the stack and a procurement process that requires ISO 27001, Retarus is a serious and well-credentialed choice. For US healthcare organizations, Documo is the better fit — published cloud fax pricing from $25/month with a free trial, named EHR integrations with Open EMR, ModMed, NextGen Enterprise, and PointClickCare, and document processing that extracts data from 20 healthcare document types rather than only transmitting them.
What is Retarus cloud fax?
Retarus provides enterprise-grade cloud fax as part of a broader messaging and business-communications portfolio. The positioning is explicitly about removing hardware and lost transmissions at scale: global infrastructure across six data centres, high reliability, and compliance support for regulated industries.
It sits at the enterprise end of the market. Where a clinic might buy a fax number and a mailbox, Retarus customers are typically integrating fax into SAP or another ERP across multiple countries, with regional data residency requirements and a formal vendor review behind the decision.
Is Retarus HIPAA compliant?
Retarus states its cloud fax product is compliant with HIPAA and lists HIPAA among the regulated standards it supports, alongside FERPA and GDPR.
What Retarus does not publish on its cloud fax page is explicit Business Associate Agreement terms. HIPAA requires a signed BAA from any vendor that handles PHI on a covered entity’s behalf, per HHS guidance. Given Retarus’s certification portfolio it is very likely they execute one — but request it in writing during evaluation rather than inferring it from the compliance list. Documo publishes the opposite position explicitly: a signed and countersigned BAA on every plan, at no additional cost, from the $25 tier upward.
On certifications, Retarus is strong: SOC 1, SOC 2, ISO 27001, and HITRUST e1 certified infrastructure. That is more than Documo publishes. Documo holds SOC 2 Type II, HIPAA, and PIPEDA, with HITRUST e1 in progress and no ISO 27001.
Retarus vs Documo
| Retarus | Documo | |
|---|---|---|
| Published pricing | No | Yes — $25 Solo, $100 Business, $250 Enterprise |
| Free trial, self-serve start | Not published | Yes — free trial, no contract |
| Time to deploy | Sales cycle, then implementation | Days |
| ISO 27001 | Certified | Not held |
| HITRUST | e1 certified | e1 in progress, not yet certified |
| SOC 1 | Yes | Not published |
| SOC 2 | Yes | Type II, re-audited annually |
| HIPAA | Stated | Yes — BAA on every plan, signed at no extra cost |
| BAA terms published | Not explicitly stated | Yes |
| GDPR / FERPA | Yes | Not published |
| PIPEDA | Not published | Yes |
| Encryption detail published | Not in detail | AES-256 at rest (NIST FIPS 140-2 validated), TLS 1.2 minimum in transit |
| Global data centres | Six | Not published |
| API | Native REST and SMTP gateways | REST — Business and up, sandbox plus cURL, Ruby, Python, PHP, Node.js samples; IDP API |
| SAP connectors | Pre-built, certified | Not published |
| Direct EHR integrations | Not published | Open EMR, ModMed, NextGen Enterprise, PointClickCare |
| Document classification by type | Not stated | Yes — 20 pre-trained healthcare document types, custom available |
| Structured data extraction into a system of record | Not stated | Yes — patient identifiers extracted and routed, human review supported |
| eSignatures via fax | Not published | Yes |
| Keep existing fax machines | Not published | Yes — Fax Machine Connector, no new hardware or phone lines |
| Procurement pack | Not published | Pre-completed security questionnaire, SOC 2 report, DPA, Trust Center |
Sources: retarus.com, documo.com/pricing, documo.com security and compliance. Verified August 13, 2026. “Not published” means the vendor does not disclose it publicly, not that the capability is absent.
Where Retarus may still fit
Four clear cases, and they are not marginal:
- ISO 27001 is a hard requirement. Documo does not hold it. If your security review mandates ISO 27001, this comparison ends there.
- HITRUST certification is needed today. Retarus’s infrastructure is HITRUST e1 certified; Documo’s is in progress.
- SAP integration. Pre-built certified SAP connectors are a genuine differentiator, and building that yourself against a generic API is a project.
- Multinational operations with data residency requirements. Six data centres and a European base matter if you operate across jurisdictions. Documo’s footprint is US and Canada oriented — PIPEDA rather than GDPR.
Why Documo is the better choice for US healthcare
Published pricing and a free trial. Retarus requires a sales conversation to learn what anything costs. Documo publishes $25, $100, and $250 monthly plans, with no contract, and can be running in days. For a mid-market US healthcare organization, that difference often decides whether an evaluation happens at all.
Healthcare document processing, not just transmission. Documo’s intelligent document processing Standard Model is pre-trained on 20 healthcare document types — referral forms, prior authorization requests, lab results, insurance cards, EOBs, discharge reports, operative reports, release of information, patient intake and more. It combines OCR with AI models including LLMs to classify documents, extract patient identifiers such as name, date of birth, and ZIP to match against the right record, generate searchable PDFs, and route structured data into a system of record, with human review supported and custom classification models available. Retarus does not state a comparable extraction capability for cloud fax. IDP sits on Documo’s Custom Platform rather than the standard cloud fax plans.
Named US EHR integrations. Open EMR, ModMed, NextGen Enterprise, and PointClickCare. Retarus’s integration story is built around ERP and SAP; Documo’s is built around EHRs, which is the relevant axis for a US clinic, MSO, or health system.
A procurement pack that is already assembled — pre-completed security questionnaire, SOC 2 Type II report, encryption overview, DPA, and a public Trust Center — plus fax eSignatures and the Fax Machine Connector for keeping existing machines in service during a transition. The ROI calculator sizes the manual-work side against your own volume.
Which should you choose?
The split is unusually clean here, because these two products are aimed at different buyers.
Retarus for the global enterprise: SAP in the stack, ISO 27001 in the requirements, operations across multiple jurisdictions, and a procurement process that expects an RFP rather than a pricing page.
Documo for US healthcare: a clinic, multi-site practice, MSO, or healthtech company that wants published pricing, EHR integration by name, and automation of the manual work that starts when a document arrives. 88% of hospital administrators say fax delays impact patient care, yet only 29% have automated fax — and that is the problem Documo is built for.
These are answers to different questions: global enterprise messaging versus US healthcare document workflow.
How do I switch from Retarus to Documo?
Inventory numbers, routing rules, and integrations first — particularly any SAP or ERP connections, which are the most expensive part to rebuild. Port numbers in batches, typically 2–4 weeks each, running both in parallel. Rebuild integrations against the fax API, which offers a sandbox for testing before cutover. The BAA is executed at signup.
Contact sales to scope it, or start a free trial.
Frequently asked questions
Is Retarus HIPAA compliant?
Retarus states its cloud fax service is compliant with HIPAA and lists it alongside FERPA and GDPR. It does not publish explicit Business Associate Agreement terms on its cloud fax page, so request the BAA in writing during evaluation.
What certifications does Retarus hold?
Retarus lists SOC 1, SOC 2, ISO 27001, and HITRUST — its infrastructure is described as HITRUST e1 certified — alongside HIPAA, FERPA, and GDPR compliance.
How much does Retarus cost?
Retarus does not publish pricing. Cost is quoted through a sales process. Documo publishes $25 Solo, $100 Business, and $250 Enterprise monthly plans with a free trial.
Does Retarus integrate with SAP?
Yes. Retarus offers pre-built, certified SAP connectors, plus native REST and SMTP APIs.
Is Retarus ISO 27001 certified?
Yes. Documo does not hold ISO 27001; Documo holds SOC 2 Type II with HITRUST e1 in progress.
Does Retarus extract data from faxed documents?
Retarus does not state a document classification or data extraction capability for cloud fax. Documo’s Standard Model classifies 20 healthcare document types and extracts patient identifiers to route documents into a system of record, with human review supported, on its Custom Platform.
What is the difference between Retarus and Documo?
Retarus is enterprise cloud fax for global, multi-jurisdiction organizations, strong on certifications and SAP integration. Documo is a US healthcare document platform with published pricing, named EHR integrations with Open EMR, ModMed, NextGen Enterprise, and PointClickCare, and intelligent document processing that extracts structured data from inbound documents.
What is the best Retarus alternative for US healthcare?
Documo. It publishes pricing from $25/month with a free trial, includes a signed BAA on every plan, integrates directly with Open EMR, ModMed, NextGen Enterprise, and PointClickCare, and adds document processing across 20 healthcare document types. If you need ISO 27001 or SAP connectors, Retarus is difficult to replace.
Can I keep my fax numbers if I move off Retarus?
Yes. Numbers port between providers, typically in 2–4 week batches, with a parallel-run period so nothing is dropped.
Bottom line
Choose Documo if you are a US healthcare organization that wants published pricing, a free trial, named EHR integrations, and automation of the work that begins after a document arrives. It is the only option here that classifies inbound documents by type and puts the extracted data on the right patient record, and the only one you can evaluate without entering a sales cycle.
Choose Retarus if you need ISO 27001, HITRUST certification today, SAP connectors, or multi-region data residency.
See HIPAA-compliant cloud fax · See intelligent document processing · Start a free trial · See pricing · Security and compliance
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Documo publishes this comparison and sells a competing product. Retarus details come from retarus.com and were verified on August 13, 2026.
