---
sidebar_position: 5
---

# .NET MAUI (legacy)

:::warning Legacy

This represents the **legacy** mobile app architecture done in .NET MAUI.

:::

The mobile .NET MAUI clients are Android and iOS applications with extensions and watchOS. They are
all located at https://github.com/bitwarden/mobile.

Principal structure is a follows:

- `App`: Main .NET MAUI project that shares code between both platforms (Android & iOS). One can see
  specific platform code under the `Platforms` folder.
- `Core`: Shared code having both logical and UI parts of the app. Several classes are a port from
  the Web Clients to C#. Here one can find most of the UI and logic since it's shared between App
  and the iOS extensions.
- `iOS.Core`: Shared code used by the main iOS app and its extensions
- `iOS.Autofill`: iOS extension that handles Autofill
- `iOS.Extensions`: iOS extension that handles Autofill from the bottom sheet extension
- `iOS.ShareExtension`: iOS extension that handles sharing files through Send
- `watchOS`: All the code specific to the watchOS platform
  - `bitwarden`: Stub iOS app so that the watchOS app has a companion app on Xcode
  - `bitwarden WatchKit App`: Main Watch app where we set assets.
  - `bitwarden WatchKit Extension`: All the logic and presentation logic for the Watch app is here

## Dependencies diagram

Below is a simplified dependencies diagram of the mobile repository.

```kroki type=plantuml
@startuml
skinparam BackgroundColor transparent
skinparam componentStyle rectangle
skinparam linetype ortho

title Simplified Dependencies Diagram

component "Core"
component "App"
component "iOS.Core"
component "iOS.Autofill"
component "iOS.Extension"
component "iOS.ShareExtension"
component "watchOS" {
   component "bitwarden"
   component "bitwarden WatchKit App"
   component "bitwarden WatchKit Extension"
}

[App] --> [Core]

[iOS.Core] --> [App]

[App] --> [iOS.Core]
[App] --> [iOS.Autofill]
[App] --> [iOS.Extension]
[App] --> [iOS.ShareExtension]
[App] --> [bitwarden WatchKit App]

[iOS.Autofill] --> [Core]
[iOS.Autofill] --> [iOS.Core]

[iOS.Extension] --> [Core]
[iOS.Extension] --> [iOS.Core]

[iOS.ShareExtension] --> [Core]
[iOS.ShareExtension] --> [iOS.Core]

[bitwarden] --> [bitwarden WatchKit App]
[bitwarden WatchKit App] --> [bitwarden WatchKit Extension]

@enduml
```