Mattermost

Secure, self-hosted team messaging and collaboration.

softwareMessaging Appsteam chatself-hostedopen-source

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Alternatives

Workplace from MetaAI-suggested

Choose Workplace from Meta if…

you need native HD video calls for up to 50 people
you want AI‑driven real‑time translation for global posts
you prefer a familiar Facebook‑style UI to reduce training
you lack the resources to manage self‑hosted infrastructure

See details

Rocket.ChatAI-suggested

Choose Rocket.Chat if…

you need guaranteed end‑to‑end encryption for chats
you want video calls with screen sharing and recording
you prefer a platform that scales to large organizations
you need multiple auth methods like LDAP without extra

See details

ThreemaAI-suggested

Choose Threema if…

you need zero‑knowledge, end‑to‑end encryption for all
you cannot expose phone numbers or email addresses for user
you must meet ISO 27001/GDPR compliance for regulated
you want an on‑premises edition hosted on Swiss‑law servers
you require minimal metadata collection and automatic

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How to Decide

Mattermost is known for its secure, self‑hosted team messaging platform and is used by enterprises and remote development teams. The alternatives split into a few clear camps: Rocket.Chat leans into a scalable architecture for large organizations with extensive integrations and 24/7 support; Threema is chosen for its on‑premises deployment option under Swiss data‑protection law and strict end‑to‑end encryption with zero‑knowledge design.

When comparing alternatives to Mattermost, focus on the deployment model (self‑hosted versus managed SaaS), the level of encryption and compliance guarantees (e.g., end‑to‑end encryption, ISO/GDPR certifications, data residency), the breadth of integrations with development and collaboration tools, and the support and pricing structure (freemium with optional paid support versus contact‑based enterprise pricing).

All Alternatives

Workplace from Meta

AI-suggested

Workplace from Meta offers a suite of communication tools—including chat, video calls, groups, and a newsfeed—designed to help employees stay connected and collaborate across locations.

✦ Best for large enterprises seeking secure, facebook‑style collaboration with native video

FreemiumProprietaryWebiOSAndroidSecure MessagingLive Video CallsGroup Communities

“Self‑hosted, secure team messaging and collaboration, offering the same core purpose for privacy‑focused enterprises.”

Rocket.Chat

AI-suggested

Rocket.Chat is an open-source communication platform designed for mission-critical operations. It provides a secure and scalable solution for team collaboration, featuring real-time messaging, video conferencing, and file sharing.

✦ Best for large enterprise teams with it expertise

FreemiumOtherWebWindowsMacReal-time MessagingVideo ConferencingFile Sharing

“Both are open‑source, self‑hostable team chat platforms offering channels, DMs and integrations for privacy‑focused teams.”

Threema

AI-suggested

Threema is a privacy-focused messaging app built on a zero-knowledge principle, meaning the company cannot access message content even if compelled to.

✦ Best for individuals and organizations that want verifiably private messaging without tying an account to a phone number

Contact for PricingProprietaryWindowsMacLinuxEnd-to-End EncryptionAnonymous SignupVoice/Video Calls