The best open source alternative to Rocket.Chat is Element. It's not free, so if you're looking for a free alternative, you could try Element or Matrix. If that doesn't suit you, our users have ranked more than 100 alternatives to Rocket.Chat and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Rocket.Chat are Zulip, Element X, Quiet Chat and Mirotalk.
Provides secure collaboration with end-to-end encryption, supporting chat, voice, and video calls. Available on all major platforms, it enables digital sovereignty with a decentralized design and interoperability through bridges to systems like Slack and Teams. Includes enterprise-grade SaaS.
Open standard protocol enabling decentralized, encrypted instant messaging, VoIP signaling, IoT device connectivity, and persistent data management across federated servers without central control or single points of failure, bridging communication platforms.
Open-source video conferencing platform with encryption by default, up to 75 participants, live group chat, HD audio, screen and document sharing, Etherpad editing, mobile and browser support, custom deployment options, privacy-first features, and community-driven development.
Threaded group conversations combine live and asynchronous messaging, separating topics for organized collaboration, supporting open-source, cloud, and self-hosted deployments, secure communication with encryption, and multi-platform access for diverse teams.
It is the brand new, and fastest ever, Matrix client. It is for personal and community use, and will support enterprise functionality later this year.
Peer-to-peer group chatting over Tor and IPFS, with local-first encrypted messaging and no central servers, offers privacy-focused decentralized collaboration for teams, supporting desktop and mobile. FOSS, open to contributors, and avoids surveillance-based tracking.
Powered by WebRTC, Real-time video call, chat room and screen sharing entirely browser based.
The preservation of privacy is the main driver for this project. Secure technologies, such as WebRTC, are used to establish a direct connection between the participants. The website that provides the web application and mediates the communication stores as little data as...
Matrix-focused desktop chat client supporting secure end-to-end encrypted messaging, voice and video calling, file sharing, emoji, room and community management, multi-theme interface, presence/status, notifications, profiles, and plugin integration for Unix.
Open-source chat platform providing community-focused group messaging, video calls, profile customization with animated avatars, custom emojis, tags, post creation, discovery of communities, and full source code access on GitHub. Entirely donation-funded.
![Profile Interface [PC - 2025]](https://img.alternativeto.net/s/618x394/avif/nerimity_993222_full.png)
![Messages View [PC - 2025]](https://img.alternativeto.net/s/618x394/avif/nerimity_281418_full.png)
![Server Discovery [PC - 2025]](https://img.alternativeto.net/s/618x394/avif/nerimity_282508_full.png)
![Server Settings [PC - 2025]](https://img.alternativeto.net/s/618x394/avif/nerimity_628028_full.png)
Conduit is a simple, fast and reliable chat server powered by Matrix. Conduit is an alternative to Synapse and tries to be lightweight and easy to install, but it is still in development.
An ad-free, theme-able, chatting platform built for privacy and security while offering a huge feature set including bot support, moderation, voice calls, screen sharing, video, embeds and many other features, it's built to be reliable and self-hosted while still allowing...
United Kingdom
United States
Italy
EU
Germany
Yes its their main competitor, except for the omnichannel feature