What Is Secure Messaging?
Mix (10 tools)
- License: 5 open source · 5 proprietary
- Hosting: 1 self-hosted · 8 SaaS · 1 both
Secure messaging platforms provide encrypted communication channels purpose-built for organizations that handle sensitive, regulated, or classified information. Unlike general team chat tools (Slack, Microsoft Teams), secure messaging platforms are designed from the ground up for compliance with industry-specific regulations and data sovereignty requirements.
These platforms serve distinct regulated environments:
- Healthcare – HIPAA-compliant clinical communication between providers, nurses, and care teams with PHI (Protected Health Information) handling
- Legal – Attorney-client privilege protection with message retention policies, litigation hold, and defensible deletion
- Financial Services – SEC/FINRA-compliant archival, surveillance, and record-keeping for electronic communications
- Government – Handling of classified information, CUI (Controlled Unclassified Information), and sovereign data with national security requirements
About this data & disclaimer
The information on these pages was researched by a combination of human review and large language models. This catalogue serves as a reference for the resources, applications, devices, deployment payloads, and other components that the ResorsIT platform integrates, deploys, and manages. To suggest an addition or correction, please contact us. Prepared by Rhodium Systems Inc., author of the ResorsIT platform — a unified IT operations management platform for IT teams and MSPs that integrates a curated suite of open-source, commercial, and SaaS applications into a single system with shared identity, single sign-on, access control, and a common audit trail. This information is compiled on a best-effort basis: it may be incomplete, contain errors, and become out of date as tools, vendors, licences, and features change. Use this catalogue only as a starting point for your own research, and independently verify and review any tool carefully against your own requirements before relying on it.
Comparison
Secure messaging platforms serve regulated environments (healthcare, legal, financial services, government) and internal secure communications.
Tool Categories
Tools are organized by primary market focus:
| Category | Tools |
|---|---|
| Open Source | Signal, Element/Matrix, Wire, Rocket.Chat, Mattermost |
| Healthcare | TigerConnect, Imprivata Cortext |
| Financial Services | Symphony |
| Government / Defense | Wickr (AWS), Element/Matrix |
| Privacy / GDPR | Threema Work, Wire |
SSO / OIDC Comparison
| Feature | Signal | Element | Wickr | Threema | Wire |
|---|---|---|---|---|---|
| OIDC support | No | Yes | Yes | No | Yes |
| SAML support | No | Yes | Yes | No | Yes |
| SCIM provisioning | No | Yes | Yes | No | Yes |
| Authentik compatible | No | Yes | Yes | No | Yes |
| MFA enforcement | No | Yes | Yes | App | Yes |
| Directory sync | No | Yes | Yes | API | Yes |
| JIT provisioning | No | Yes | Yes | No | Yes |
| Feature | Rocket.Chat | Mattermost | TigerConnect | Imprivata | Symphony |
|---|---|---|---|---|---|
| OIDC support | Yes | Yes | Yes | Yes | Yes |
| SAML support | Yes | Yes | Yes | Yes | Yes |
| SCIM provisioning | Yes | Yes | Yes | Yes | Yes |
| Authentik compatible | Yes | Yes | Likely | Likely | Yes |
| MFA enforcement | Yes | Yes | Yes | Yes | Yes |
| Directory sync | Yes | Yes | Yes | Yes | Yes |
| JIT provisioning | Yes | Yes | Yes | Yes | Yes |
API Comparison
| Feature | Signal | Element | Wickr | Threema | Wire |
|---|---|---|---|---|---|
| REST API | No | Yes | Yes | Yes | Yes |
| WebSocket / Events | No | Yes | No | No | Yes |
| Webhooks | No | Yes | Yes | Yes | Yes |
| Bot framework | No | Yes | Yes | Yes | Yes |
| API documentation | N/A | Excellent | Good | Good | Good |
| Rate limiting | N/A | Yes | Yes | Yes | Yes |
| SDKs | No | Yes | Yes | No | Yes |
| Feature | Rocket.Chat | Mattermost | TigerConnect | Imprivata | Symphony |
|---|---|---|---|---|---|
| REST API | Yes | Yes | Yes | Limited | Yes |
| WebSocket / Events | Yes | Yes | No | No | Yes |
| Webhooks | Yes | Yes | Yes | Limited | Yes |
| Bot framework | Yes | Yes | No | No | Yes |
| API documentation | Excellent | Excellent | Good | Limited | Excellent |
| Rate limiting | Yes | Yes | Yes | Yes | Yes |
| SDKs | Yes | Yes | No | No | Yes |
Feature Matrix
Encryption & Security
| Feature | Signal | Element | Wickr | Threema | Wire |
|---|---|---|---|---|---|
| E2EE (messages) | Yes | Yes | Yes | Yes | Yes |
| E2EE (voice) | Yes | Yes | Yes | Yes | Yes |
| E2EE (video) | Yes | Yes | Yes | Yes | Yes |
| E2EE (files) | Yes | Yes | Yes | Yes | Yes |
| Forward secrecy | Yes | Yes | Yes | Yes | Yes |
| Protocol | Signal | Olm/Megolm | Wickr | NaCl | Proteus/MLS |
| Open protocol | Yes | Yes | No | No | Partial |
| Feature | Rocket.Chat | Mattermost | TigerConnect | Imprivata | Symphony |
|---|---|---|---|---|---|
| E2EE (messages) | Yes | No | Yes | Yes | Yes |
| E2EE (voice) | No | No | No | No | Yes |
| E2EE (video) | No | No | No | No | Yes |
| E2EE (files) | Yes | No | Yes | Yes | Yes |
| Forward secrecy | No | No | N/A | N/A | Yes |
| Protocol | Custom | TLS only | Proprietary | Proprietary | SBE |
| Open protocol | No | No | No | No | No |
Message Lifecycle
| Feature | Signal | Element | Wickr | Threema | Wire |
|---|---|---|---|---|---|
| Ephemeral messages | Yes | No | Yes | No | Yes |
| Message retention | No | Yes | Yes | No | Yes |
| Remote wipe | No | Yes | Yes | Yes | Yes |
| Message recall | No | No | Yes | No | Yes |
| Litigation hold | No | No | Yes | No | Yes |
| Feature | Rocket.Chat | Mattermost | TigerConnect | Imprivata | Symphony |
|---|---|---|---|---|---|
| Ephemeral messages | No | No | Yes | Yes | Yes |
| Message retention | Yes | Yes | Yes | Yes | Yes |
| Remote wipe | Yes | Yes | Yes | Yes | Yes |
| Message recall | Yes | Yes | Yes | Yes | Yes |
| Litigation hold | No | Yes | Yes | Yes | Yes |
Communication Features
| Feature | Signal | Element | Wickr | Threema | Wire |
|---|---|---|---|---|---|
| 1:1 messaging | Yes | Yes | Yes | Yes | Yes |
| Group messaging | Yes | Yes | Yes | Yes | Yes |
| Voice calls | Yes | Yes | Yes | Yes | Yes |
| Video calls | Yes | Yes | Yes | Yes | Yes |
| File sharing | Yes | Yes | Yes | Yes | Yes |
| Read receipts | Yes | Yes | Yes | Yes | Yes |
| Priority messages | No | No | Yes | No | No |
| Broadcast | No | No | Yes | No | No |
| Feature | Rocket.Chat | Mattermost | TigerConnect | Imprivata | Symphony |
|---|---|---|---|---|---|
| 1:1 messaging | Yes | Yes | Yes | Yes | Yes |
| Group messaging | Yes | Yes | Yes | Yes | Yes |
| Voice calls | Yes | Yes | Yes | Yes | Yes |
| Video calls | Yes | Yes | Yes | Yes | Yes |
| File sharing | Yes | Yes | Yes | Yes | Yes |
| Read receipts | Yes | Yes | Yes | Yes | Yes |
| Priority messages | No | No | Yes | Yes | No |
| Broadcast | Yes | Yes | Yes | Yes | Yes |
Administration & Federation
| Feature | Signal | Element | Wickr | Threema | Wire |
|---|---|---|---|---|---|
| Admin console | No | Yes | Yes | Yes | Yes |
| Device mgmt | No | Yes | Yes | Yes | Yes |
| Screenshot prevention | No | No | Yes | No | No |
| Federation | No | Yes | No | No | Yes |
| On-prem deployment | No | Yes | Yes | Yes | Yes |
| Air-gapped | No | Yes | Yes | No | Yes |
| Feature | Rocket.Chat | Mattermost | TigerConnect | Imprivata | Symphony |
|---|---|---|---|---|---|
| Admin console | Yes | Yes | Yes | Yes | Yes |
| Device mgmt | Yes | Yes | Yes | Yes | Yes |
| Screenshot prevention | No | No | Yes | Yes | No |
| Federation | Yes | No | No | No | No |
| On-prem deployment | Yes | Yes | No | No | Yes |
| Air-gapped | Yes | Yes | No | No | No |
Compliance Comparison
| Compliance | Signal | Element | Wickr | Threema | Wire |
|---|---|---|---|---|---|
| HIPAA (BAA) | No | Partner | Yes | No | No |
| FINRA/SEC | No | No | No | No | No |
| FedRAMP | No | No | High | No | No |
| GDPR | Partial | Yes | Yes | Yes | Yes |
| SOC 2 | No | Yes | Yes | No | Yes |
| ISO 27001 | No | Yes | Yes | Yes | Yes |
| Gov use | Limited | FR/DE/UK | US DoD | CH/EU | EU |
| Compliance | Rocket.Chat | Mattermost | TigerConnect | Imprivata | Symphony |
|---|---|---|---|---|---|
| HIPAA (BAA) | Yes | Yes | Yes | Yes | No |
| FINRA/SEC | No | No | No | No | Yes |
| FedRAMP | No | Moderate | No | No | No |
| GDPR | Yes | Yes | Yes | Yes | Yes |
| SOC 2 | Yes | Yes | Yes | Yes | Yes |
| ISO 27001 | Yes | Yes | Yes | Yes | Yes |
| Gov use | Various | US DoD | No | No | No |
Deployment Comparison
| Aspect | Signal | Element | Wickr | Threema | Wire |
|---|---|---|---|---|---|
| SaaS | Yes | Yes | Yes | Yes | Yes |
| Self-hosted | No | Yes | Yes | Yes | Yes |
| Docker | N/A | Yes | Yes | Yes | Yes |
| Kubernetes | N/A | Yes | Yes | No | Yes |
| Air-gapped | No | Yes | Yes | No | Yes |
| HA support | N/A | Yes | Yes | No | Yes |
| Aspect | Rocket.Chat | Mattermost | TigerConnect | Imprivata | Symphony |
|---|---|---|---|---|---|
| SaaS | Yes | Yes | Yes | Yes | Yes |
| Self-hosted | Yes | Yes | No | No | Yes |
| Docker | Yes | Yes | N/A | N/A | Yes |
| Kubernetes | Yes | Yes | N/A | N/A | Yes |
| Air-gapped | Yes | Yes | No | No | No |
| HA support | Yes | Yes | Yes | Yes | Yes |
Pricing Summary
| Tool | Model | Starting Price |
|---|---|---|
| Signal | Free | Free (no enterprise tier) |
| Element | Per-user SaaS or self-hosted | ~$5/user/month (EMS) |
| Wickr | Per-user | Contact AWS sales |
| Threema Work | Per-device | CHF 1.99/device/month |
| Wire | Per-user | ~$5.83/user/month |
| Rocket.Chat | Per-user + self-hosted free | Free (Community); ~$4/user/month (Pro) |
| Mattermost | Per-user + self-hosted free | Free (Community); ~$10/user/month (Pro) |
| TigerConnect | Per-user | Contact sales (~$10-15/user/month) |
| Imprivata Cortext | Per-user | Contact sales |
| Symphony | Per-user | Contact sales (enterprise pricing) |
Observations
Open Source Strength
This category has excellent OSS coverage: 5 of 10 evaluated tools are open source. Signal sets the gold standard for E2EE protocol design. Element/Matrix provides the strongest federated, self-hosted option with significant government adoption. Rocket.Chat and Mattermost overlap with general team chat but are included here specifically for their compliance and security capabilities in regulated environments.
Healthcare
TigerConnect and Imprivata Cortext dominate the healthcare-specific messaging space with purpose- built clinical workflows (role-based messaging, on-call schedules, EHR integration). For organizations wanting OSS alternatives, Rocket.Chat with HIPAA-compliant self-hosted deployment is the strongest option.
Financial Services
Symphony has near-monopoly status in Wall Street messaging with purpose-built FINRA/SEC compliance. No strong OSS alternative exists for the financial services compliance requirements (WORM archival, surveillance workflows).
Government and Defense
Element/Matrix and Wickr (AWS) lead this space. Element/Matrix has the strongest government adoption story globally (France, Germany, UK, NATO), while Wickr holds FedRAMP High and is used by US defense agencies. For air-gapped / sovereign deployments, Element/Matrix is the clear choice.
Self-Hosted Regulated Environments
For organizations requiring full data sovereignty with on-premises deployment, the strongest options are:
- Element/Matrix – federated, government-proven, Apache 2.0
- Rocket.Chat – full-featured, MIT license, HIPAA-capable
- Mattermost – compliance features, FedRAMP Moderate, DevOps integration
- Wire – Swiss privacy, E2EE by default, AGPL clients
Tools
10 tools.
Element / Matrix
Element is the flagship client for the Matrix open standard – a decentralized, federated communication protocol.
License: Apache-2.0 (OSS) · Kind: web · Deploy: saas · SSO: OIDC, SAML
ResorsIT usage: Web App with SSO
Access & Identity: Single sign-on · Provisioned account
Imprivata Cortext
Imprivata Cortext is a healthcare clinical communication platform that is part of the broader Imprivata digital identity platform.
License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: OIDC, SAML
ResorsIT usage: Web App with SSO
Access & Identity: Single sign-on · Provisioned account
Mattermost
Mattermost is an open-source collaboration and messaging platform for developer and operational workflows, with channels, playbooks, compliance exports, and self-hosted or cloud deployment.
License: MIT (OSS) · Kind: web · Deploy: saas · SSO: OIDC, SAML
ResorsIT usage: Web App with SSO
Access & Identity: Single sign-on
Rocket.Chat
Rocket.Chat is an open-source team communication platform that provides Slack-like functionality with the ability to self-host.
License: MIT (OSS) · Kind: web · Deploy: saas · SSO: OIDC, SAML
ResorsIT usage: Web App with SSO
Access & Identity: Single sign-on
Signal
Signal is the gold standard for end-to-end encrypted messaging, developed by the Signal Foundation (a 501(c)(3) nonprofit).
License: AGPL-3.0-only (OSS) · Kind: web · Deploy: saas · SSO: none
ResorsIT usage: Web App without SSO
Access & Identity: Vaulted credential
Symphony
Symphony is a secure messaging platform for financial services, founded by major Wall Street banks, providing end-to-end encryption while meeting regulatory archival and surveillance requirements.
License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: OIDC, SAML
ResorsIT usage: Web App with SSO
Access & Identity: Single sign-on · Provisioned account
Threema Work
Threema Work is the enterprise version of Threema, a Swiss secure messaging app that distinguishes itself by requiring no phone number or email for registration.
License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: none
ResorsIT usage: Web App without SSO
Access & Identity: Vaulted credential
TigerConnect
TigerConnect (formerly TigerText) is the leading healthcare-specific secure messaging platform, purpose-built for HIPAA-compliant clinical communication.
License: Proprietary (proprietary) · Kind: web · Deploy: saas · SSO: OIDC, SAML
ResorsIT usage: Web App with SSO
Access & Identity: Single sign-on · Provisioned account
Wickr (AWS)
Wickr is a proprietary enterprise secure messaging platform owned by AWS, with end- to-end encrypted messaging, calls, and files, ephemeral messages, admin controls, and compliance archival.
License: Proprietary (proprietary) · Kind: web · Deploy: direct · SSO: OIDC, SAML
ResorsIT usage: Web App with SSO
Access & Identity: Single sign-on · Provisioned account
Wire
Wire is a Swiss-based enterprise secure messaging platform with end-to-end encryption enabled by default for all communications.
License: AGPL-3.0-only (OSS) · Kind: web · Deploy: direct, saas · SSO: OIDC, SAML
ResorsIT usage: Web App with SSO
Access & Identity: Single sign-on · Provisioned account
