Open source chat server and client android

While deciding to build chat or a messenger application the developer often look for different options, at the end it’s all about the requirements.

There are many commercial services and development tools to build chat/ messaging applications with different features set. However, it’s difficult to find open-source and free options.

In this article we will explore open-source options that aid developers to build real-time chat apps.

Why would you choose an open-source tool for building a messaging app?

  1. Productivity: With these tools the developers can create a functional chat application in no time with little customization.
  2. Stability: a Supportive development environment is often more stable than building from scratch, especially with open-source community packed projects.
  3. Battle-tested: Open-source projects used with real-life for end-users products.
  4. Over all re-inventing the wheel is time and resources consuming, even though it has, it’s educational values
  5. Community support
  1. ChatSDK
    ChatSDK is our top pick not just because of its rich features list, but because it has a dual license and supports iOS and Android.

    It allows users to add chat support to their existing app or build a complete new application.

    Its features include: private and public groups, user profiles, basic login, social login (Facebook, Twitter & Google), Push notification,  search support, anonymous login, multiple message types and messages history.

    Though it is free and open-source to use the project in a commercial project you need to buy a commercial license.

    Website – GitHub

  2. Chat21

    Chat21 is an open-source SDK set for building or integrating messaging functionalities into Android, iOS or Ionic applications on top of Google’s Firebase database.

    In addition to the basic chat functionalities, Chat21 is packed with set of useful features as address book, push notification, group chat, direct messages,

    Chat21 offers a quick integration and multiple SDK support which include a web client and a pure JavaScript widget client, which comes handy when building a web chat widget.

  3. Firechat:
    Firechat is a complete web-based open-source widgetized chat application based on Firebase.

    Features of Firechat include: direct messaging, multi-room chat support, authentication support, moderator options, user presence, full-text search for messages, private messages, invitations and easy to integrate with existing web application.

    Firechat is built on top of jQuery, underscore.js, Bootstrap CSS framework. The source code is released under MIT license.

  4. Native Chat SDK for Android:

    If you want to develop a messaging application for Android devices with native performance, This GitHub repo contains an open-source native Android chat SDK.

    It’s supported and maintained by active developers and gaining popularity among Android developers.

  5. iOS Native  Open-source Messenger SDK:
    This is a complete stable project that offers a rich iOS development set for creating iOS chat application.  

    It features private messaging, attachment support including audio messaging, calling, video calling, archive or block users, wallpapers, user last active, push notification, media message re-download, download media on Wi-Fi,  advanced cache management  and complete message media support.

    In addition to the mentioned features, it offers complete integration with iOS share menu, extra fancy options like sending current location, stickers support, load old messages, typing indicator and save all media into the device.

    iOS Messenger SDK supports Firebase for full real-time actions, a Realm database for local data with AES-256 encryption.

    It works seamlessly with MessageKit chat user interface and supports iOS Dark Mode.

  6. MessageKit (iOS)

    MessageKit is an open-source chat and messaging UI Kit for iOS. It’s a community-driven project to replace the old obsolete JSQMessagesViewController.

    It’s highly customizable and supported.  


  7. is a complete open-source messaging platform built on top of Meteor JavaScript and MongoDB, a NoSQL Document Database. is self-hosted which means it can be installed anywhere, it also provides a rich API set to build applications over it. However, It offers open-source Android and iOS clients.

    As a complete messaging platform, consider as the open-source alternative for Slack and managed messaging system with a powerful back-end controls.

  8. ZulipChat:
    ZulipChat is another complete messaging platform similar to and Slack. I listed it here because it’s a pure open-source project with customizable Android and iOS clients.

    ZulipChat is the best open-source alternative for Slack and enterprise work because it offers integration with dozens of enterprise tools and solutions like GitHub, JIRA, Zendesk, Sentry and Travis CI.

  9. Matrix
    Matrix is an open-source project for secure decentralized communication.  It features a rich SDK support for web (HTTP APIs), iOS and Android.  The development tools start from creating messaging client to chatbots.

    Matrix also offers End-to-End encryption, VoIP support, Bridging and WebRTC support for video calling.

  10. Meteor
    Meteor is a JavaScript platform for building web and mobile apps with the same codebase. It offers a complete support for React, Angular, Blaze and recently Vue Framework.

    With MongoDB for the backend, Meteor is the best platform for real-time applications.

    I have used Meteor with Angular, Ionic, Blaze + Cordova and React, It’s proven to be reliable and productive.

  11. Ionic

    Ionic is a mobile development platform for iOS and Android. It has a rich ecosystem which contains extensions and templates.

    There are many open-source commercial Ionic templates for building messaging application, also Ionic plays well with React, Angular and soon Vue framework as well as it integrates seamlessly with Google’s Firebase.  

    One of the upsides of  Ionic: it’s packed with a large community of developers which ensures a quality end-product.

  12. Parse
    Parse is an open-source real-time platform which provides a backend and rich set of SDK for developers that include native iOS development (Swift, ObjectiveC) and Android.  It also offers .Net (Xamarin), Unity, PHP and Arduino SDKs.

    ParseServer is a server application that works directly with MongoDB. Parse offers a user authentication, push notification and control dashboard.

    Parse is a well-established project to build real-time application especially messaging application, it’s also free and supported by experienced developers and a large community.


As this article came to an end, I listed the best available options to build a messaging application, I recommend setting the requirement first and matching them with the items on this list before jumping into the development.

Photo by Miguel Á. Padriñán from Pexels

The first thing we usually do after waking up in the morning is to check our cellphone to see if there are important messages from our colleagues and friends. Whether or not it’s a good idea, this behavior has become part of our daily lifestyle.

“Man is a rational animal. He can think up a reason for anything he wants to believe.”

– Anatole France

No matter the soundness of the reason, we all have a suite of communication tools—email, phone calls, web-conferencing tools, or social networking—we use on a daily basis. Even before COVID-19, working from home already made these communication tools an essential part of our world. And as the pandemic has made working from home the new normal, we’re facing unprecedented changes to how we communicate, which makes these tools not merely essential but now required.

Why chat?

When working remotely as a part of a globally distributed team, we must have a collaborative environment. Chat applications play a vital role in helping us stay connected. In contrast to email, chat applications provide fast, real-time communications with colleagues around the globe.

There are a lot of factors involved in choosing a chat application. To help you pick the right one for you, in this article, I’ll explore four open source chat applications and one open source video-communication tool (for when you need to be “face-to-face” with your colleagues), then outline some of the features you should look for in an effective communication application.

4 open source chat apps



Rocket.Chat is a comprehensive communication platform that classifies channels as public (open to anyone who joins) or private (invitation-only) rooms. You can also send direct messages to people who are logged in; share documents, links, photos, videos, and GIFs; make video calls; and send audio messages without leaving the platform.

Rocket.Chat is free and open source, but what makes it unique is its self-hosted chat system. You can download it onto your server, whether it’s an on-premises server or a virtual private server on a public cloud.

Rocket.Chat is completely free, and its source code is available on GitHub. Many open source projects use Rocket.Chat as their official communication platform. It is constantly evolving with new features and improvements.

The things I like the most about Rocket.Chat are its ability to be customized according to user requirements and that it uses machine learning to do automatic, real-time message translation between users. You can also download Rocket.Chat for your mobile device and use it on the go.


IRC on WeeChat 0.3.5

Internet Relay Chat (IRC) is a real-time, text-based form of communication. Although it’s one of the oldest forms of electronic communication, it remains popular among many well-known software projects.

IRC channels are discrete chat rooms. It allows you to have conversations with multiple people in an open channel or chat with someone privately one-on-one. If a channel name starts with a #, you can assume it to be official, whereas chat rooms that begin with ## are unofficial and usually casual.

Getting started with IRC is easy. Your IRC handle or nickname is what allows people to find you, so it must be unique. But your choice of IRC client is completely your decision. If you want a more feature-rich application than a standard IRC client, you can connect to IRC with

Given its age, why should you still be on IRC? For one reason, it remains the home for many of the free and open source projects we depend on. If you want to participate in open source software and communities, IRC is the option to get started.



Zulip is a popular group-chat application that follows the topic-based threading model. In Zulip, you subscribe to streams, just like in IRC channels or Rocket.Chat. But each Zulip stream opens a topic that is unique, which helps you track conversations later, thus making it more organized.

Like other platforms, it supports emojis, inline images, video, and tweet previews. It also supports LaTeX for sharing math formulas or equations and Markdown and syntax highlighting for sharing code.

Zulip is cross-platform and offers APIs for building your own integrations. Something I especially like about Zulip is its integration feature with GitHub: if I’m working on an issue, I can use Zulip’s marker to link back to the pull request ID.

Zulip is open source (you can access its source code on GitHub) and free to use, but it has paid offerings for on-premises support, LDAP integration, and more storage.

Let’s Chat

Let's Chat

Let’s Chat is a self-hosted chat solution for small teams. It runs on Node.js and MongoDB and can be deployed to local servers or hosted services with a few clicks. It’s free and open source, with the source code available on GitHub.

What differentiates Let’s Chat from other open source chat tools is its enterprise features: it supports LDAP and Kerberos authentication. It also has all the features a new user would want: you can search message history in the archives and tag people with mentions like @username.

What I like about Let’s Chat is that it has private and password-protected rooms, image embeds, GIPHY support, and code pasting. It is constantly evolving and adding more features to its bucket.

Bonus: Open source video chat with Jitsi


Sometimes text chat isn’t enough, and you need to talk to someone face-to-face. In times like these, when in-person meetings aren’t an option, video chat is the best alternative. Jitsi is a complete, open source, multi-platform, and WebRTC-compliant videoconferencing tool.

Jitsi began with Jitsi Desktop and has evolved into multiple projects, including Jitsi Meet, Jitsi Videobridge, jibri, and libjitsi, with source code published for each on GitHub.

Jitsi is secure and scalable and supports advanced video-routing concepts such as simulcast and bandwidth estimation, as well as typical capabilities like audio, recording, screen-sharing, and dial-in features. You can set a password to secure your video-chat room and protect it against intruders, and it also supports live-streaming over YouTube. You can also build your own Jitsi server and host it on-premises or on a virtual private server, such as a Digital Ocean Droplet.

What I like most about Jitsi is that it is free and frictionless; anyone can start a meeting in no time by visiting, and users are good to go with no need for registration or installation. (However, registration gives you calendar integrations.) This low-barrier-to-entry alternative to popular videoconferencing services is helping Jitsi’s popularity spread rapidly.

Tips for choosing a chat application

The variety of open source chat applications can make it hard to pick one. The following are some general guidelines for choosing a chat app.

  • Tools that have an interactive interface and simple navigation are ideal.
  • It’s better to look for a tool that has great features and allows people to use it in various ways.
  • Integrations with tools you use can play an important role in your decision. Some tools have great and seamless integrations with GitHub, GitLab, and certain applications, which is a useful feature.
  • It’s convenient to use tools that have a pathway to hosting on cloud-based services.
  • The security of the chat service should be taken into account. The ability to host services on a private server is necessary for many organizations and individuals.
  • It’s best to select communication tools that have rich privacy settings and allow for both private and public chat rooms.

Since people are more dependent than ever on online services, it is smart to have a backup communication platform available. For example, if a project is using Rocket.Chat, it should also have the option to hop into IRC, if necessary. Since these services are continuously updating, you may find yourself connected to multiple channels, and this is where integration becomes so valuable.

Of the different open source chat services available, which ones do you like and use? How do these tools help you work remotely? Please share your thoughts in the comments.

Written by Jane