# messenger-app-android: Mesibo's open source WhatsApp style messenger for Android

> Mesibo Messenger for Android is a Java reference application built on the Mesibo SDKs, with messaging, group chat, voice and video calls, conferencing, end-to-end encryption and push notifications. It suits a developer who wants to stand up a branded messenger on the Mesibo platform quickly, and it is a client app whose backend and accounts live in the Mesibo console, not a self-contained product.

**mesibo/messenger-app-android** — Open Source Messenger App For Android - Real-time Messaging, Voice and Video Calls

- Repository: https://github.com/mesibo/messenger-app-android
- Website: https://mesibo.com
- Stars: 729 · Forks: 229
- Language: Java
- License: NOASSERTION
- Published: 2026-10-21 · Updated: 2026-10-21 · Language: en
- Canonical page: https://hysenlabs.com/projects/mesibo-messenger-app-android

## A reference client, not a messenger you can drop in on its own

Mesibo Messenger for Android is an open-source app with real-time messaging, voice and video call features, and this repository holds the source code for it. There is a matching repository for the iOS version, which tells you the shape of the project: one application per platform, both built against the same backend.

The important thing to understand before reading any code is that this is a client, not a product you can pick up and run. The README is explicit on two points. The app requires a valid phone number and an OTP to log in, and the OTP is not sent by the app, it is generated from the Mesibo console. And all the users are private to your app and account: the demo app cannot see or communicate with users from other apps.

That second point is the load-bearing one. The user graph is per application on the Mesibo side, not per phone number, and the demo uses contact synchronisation to find other users of your app and to make sure the correct phone number is used. So a build of this app is a private network of users, and the accounts live in a Mesibo console you own rather than in a database you host.

The feature list covers the ground a modern messenger needs. One-on-one messaging and group chat, high quality voice and video calling, video and voice conferencing, and rich messaging covering text, picture, video, audio and other files. There is end-to-end encryption, location sharing, message status and typing indicators, online status with real-time profile update, and push notifications.

The audience is therefore a developer or an organisation that wants a messenger branded as their own, running on the Mesibo platform, and the code is Java in an app directory with a Gradle build.

## Cloning and building, which the README calls trivial

The build instructions are the shortest part of the documentation, and the README does not oversell the difficulty: the tutorial it links describes compilation instructions as trivial though.

The recommended way to get the code is a clone, and the reasoning is given: if you have git installed, this is recommended because you can quickly sync and stay up to date with the latest version, and it is also the preferred way if you decide to contribute to the project.

```bash
    $ mkdir Messenger
    $ cd Messenger
    $ git clone https://github.com/mesibo/messenger-app-android.git
```

The repository is a standard Android project, with build.gradle, settings.gradle, gradle.properties, a gradlew wrapper and gradlew.bat alongside the app directory, so the wrapper means you do not need a locally installed Gradle.

The build itself is a menu-driven sequence in Android Studio. You need the latest Android Studio installed and an Android device. You open the project from the folder where you downloaded the code using the File -> Open menu, build it with Build -> Rebuild Project, and the README warns that the first build may take a while. Then you run it on the device with Run -> Run (app), and the welcome screen appears.

After that you log in with your phone number and the OTP from the Mesibo console, and the README's closing remark is that you can start using the app you have just built to communicate with your family and friends.

The staying up to date advice is worth a second look, because it contains a small trap. Whatever approach you take to download the code, it is important to stay up to date with the latest changes, new features and fixes, and the project asks you to Star the repository on GitHub to be notified whenever the source code is updated. That notification is about the repository, and it does not tell you whether the Mesibo SDK versions the app links against have changed. There are no GitHub releases in this repository, so the commit history is the only version record on this side.

## The Mesibo SDKs and the one third-party dependency

The README lists the SDKs the app uses, and they are all first-party, which is the clearest statement about where the real work lives.

There is the Mesibo SDK itself, the Mesibo Messaging UI Module, and the Mesibo Call UI Module. The split explains a lot about the structure of the code. The SDK is the transport and account layer, the Messaging UI Module supplies the chat screens, and the Call UI Module supplies the voice and video calling screens including the conferencing. A developer reading the app directory is reading the application logic on top of those three, not the messaging stack itself.

There is one third-party dependency named, and it is a pair of Google services. The Google Maps and Google Places SDKs are used for geolocation integration, which is what the location sharing feature is built on.

The backend is a separate repository, mesibo/messenger-app-backend, and the README describes the deployment choices as a set of options. You can download the backend source code and host it on your server, with the default one located on the Mesibo server. The documentation describes hosting the entire real-time messaging and call server on your premise, and other customizations and rebranding are also covered there.

So the architecture is three parts. This app, the backend, and the Mesibo console that holds the accounts. Hosting the backend yourself is the option that changes the data path, and it is the one the tutorial spends most of its words on, along with rebranding, which is the part a business user is most likely to want.

## What the licence field does and does not tell you

The licence for this repository is recorded as a custom one that GitHub cannot classify, with the terms in the LICENSE file, and the top level of the repository carries a COPYRIGHT.md. That is worth reading carefully, and it is a different situation from the MIT, Apache or GPL terms that the licence classifier would recognise.

What can be said is that this is not the usual open source licence story. The repository describes itself as an open-source app, and it is published under a licence whose terms are not machine-readable, so a team that needs to know what it can and cannot do with the code has to read the file. The guidance here is not legal advice; it is that the classification field is not a substitute for reading the terms when they are this specific.

The maintenance picture is clearer. The last push was on 2026-04-28, so the source is receiving occasional commits, and the repository has no GitHub releases. There is no tagged version to pin.

The primary language is Java, and the project description is a single line, an Open Source Messenger App For Android for real-time messaging, voice and video calls. The iOS counterpart lives in its own repository, so the two clients are released independently and a team building both is tracking two codebases.

## Against a self-hosted messenger stack and against a build from the platform docs

The realistic alternatives are two, and they bracket this project.

The first is to build the client yourself against the same SDKs. The Mesibo documentation is the place where the platform is described, and a team that has a specific design in mind, or needs features this app does not have, may find it faster to build the screens rather than to unpick someone else's. The tutorial the README links is literally titled A fully featured WhatsApp clone using mesibo, so the documentation is written on the assumption that you might do exactly that, and the app in this repository is one worked example of it. What you give up is everything that is already built, including the contact synchronisation flow, the call and conferencing screens, and the message status and presence handling.

The second alternative is to self-host the entire stack, including the backend, and use a different client, or your own. The README makes clear that hosting the messaging and call server on your own premise is a supported configuration, and the backend repository is public. The difference is where the user directory and the message history live. With the default setup on the Mesibo server, your users belong to your Mesibo account and the backend is Mesibo's. Self-hosting moves the backend onto your own server, and with it a larger share of the operational burden, and it does not change the fact that the account system and the SDK licensing remain Mesibo's.

That is the shape of the decision. This repository removes the work of building a client, and does not remove the work of operating a messenger. A team that has decided to run on the Mesibo platform gets a lot for free here. A team that has decided to run its own infrastructure gets nothing from this app, because the client is the part that was never the hard problem to own.

## Conclusion

messenger-app-android fits a developer or business that wants a branded messenger on Android running on the Mesibo platform, and wants the whole client as a starting point rather than a from-scratch UI. It does not fit a team that wants to own its signalling and media infrastructure, because the backend is a separate repository you host against a Mesibo account, and the user graph lives inside that account. Before building on it, read the WhatsApp clone tutorial in the Mesibo documentation, and confirm the SDKs the app links against are the ones you can license for your use, since the app is only the client half of a system that also needs the mesibo console and a hosted backend.

## FAQ

### How do I log in to the Mesibo Messenger Android app?

The app requires a valid phone number and an OTP, and the app itself does not send OTPs. You generate an OTP for any number from the Mesibo console, then log in with the phone number and that OTP.

### Can users of the Mesibo Messenger demo app message users of other apps?

No. The README states that all the users are private to your app and account, and that the demo app cannot see or communicate with users from other apps. It uses contact synchronisation to find other users of your app and ensure the correct phone number is used.

### How do I build messenger-app-android?

Clone the repository with git, then open the folder in Android Studio with File -> Open, build with Build -> Rebuild Project, and run on a device with Run -> Run (app). The README notes the first build may take a while, and that you need the latest Android Studio and an Android device.

### Which Mesibo SDKs does the messenger app use?

The README lists the Mesibo SDK, the Mesibo Messaging UI Module and the Mesibo Call UI Module, along with the Google Maps and Google Places SDKs for geolocation integration. The backend code is a separate repository at mesibo/messenger-app-backend.

## Sources

- [Issues](https://github.com/mesibo/messenger-app-android/issues)
- [mesibo/messenger-app-android on GitHub](https://github.com/mesibo/messenger-app-android)
- [Project website](https://mesibo.com)
- [README](https://github.com/mesibo/messenger-app-android/blob/master/README.md)

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Hysen Labs editorial analysis, written from the project's own repository and release notes. Cite the canonical page: https://hysenlabs.com/projects/mesibo-messenger-app-android