Quaternion

At a glance

• Editor score
  6.2 / 10
• Pricing
  Free plan
• Best for
  Desktop users wanting a straightforward Matrix client
• Free plan
  Yes
• Paid from
  Free
• Network architecture
  Federated
• Facts checked
  22 Oct 2026

• Where it wins

  • Connects to Matrix networks and displays rooms and message timelines
  • Supports encrypted rooms and sending file attachments
  • Runs on Linux, Windows, and macOS with configurable display settings

• Where it doesn't

  • Requires a Matrix account and server to connect
  • Older messages in encrypted rooms may not decrypt because of a libQuotient limitation
  • Community is the listed support channel

Our verdict on Quaternion

Quaternion is a free, open-source desktop messaging client for people who already have or plan to use a Matrix account. It connects to Matrix networks rather than operating its own messaging server, so an account and server are required. Available for Linux, Windows, and macOS, it provides room and conversation browsing with message timelines, group chat, and file attachments. Its scope is deliberately focused on desktop Matrix messaging rather than a broad set of networks or platforms.

For everyday use, Quaternion offers controls for notifications, including popup behavior, alongside configurable timeline layout and scrolling. The published feature set also includes end-to-end encrypted rooms. Encryption has an important caveat: older messages in encrypted rooms may not decrypt because of a libQuotient limitation. Buyers who rely on accessing a complete history of encrypted conversations should weigh that limitation before choosing it.

Quaternion fits solo users and small groups seeking a free, open-source desktop client and comfortable with the Matrix ecosystem. It is less suitable for people who want messaging without managing a Matrix account and server, or who need broader platform coverage than desktop systems. The listed support channel is community, so organizations that require a dedicated support route should consider an alternative. Choose Quaternion for straightforward Matrix access on a desktop; look elsewhere if account independence, broader ecosystem coverage, or dependable access to older encrypted messages is essential.

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Quaternion pricing

Quaternion fact sheet

Quaternion integrations

Quaternion lists 1 integrations on its own site.

• Matrix

Alternatives to Quaternion

• ElementA Matrix-based collaboration app with encrypted messaging and flexible deployment options.9.4
• Delta ChatA free, open-source messenger with default end-to-end encryption across desktop and mobile.9.2
• SimpleX ChatPrivate messaging with encrypted chats, calls, files and groups—without profile identifiers.9.1

See all Quaternion alternatives →

Featured on iTechGuides

Quaternion is listed in our Decentralized Messaging Apps directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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Last updated 28 Oct 2026 · How we research and update