Quizzify is an app in which we can play unlimited quizzes with our friends for free. Gain some more general knowledge while having fun with friends.

Video Introduction ?

This is a small introduction video about Quizzify.


Blog ✍

To know more about how I build this project, read my article on https://vaibhav2002.hashnode.dev/quizzify-play-unlimited-quizzes-with-your-friends-for-free

Application Install

You can Install and test latest Quizzify app from below ?



  • Clone the repository on your machine.
  • Create project in Firebase, enable authentication (email and Google Auth) and download google-services.json and paste in the app folder.
  • Sign up hasura, connect database and do the following:

Open secrets.xml and google web client url for Firebase google auth

<!--    add your google web cient id here-->
<string name="web_client_id"></string>

Open GraphQLSecrets.kt in util package and add your Hasura credentials

//Add your hasura url here
const val HASURA_URL = "" 

//Add your hasura websocket url here (same as hasura url but with wss in place of https)
const val HASURA_WEB_SOCKET_URL = ""

//Add your hasura secret key here
const val SECRET_KEY = ""


It uses Firebase and Hasura as its backend. It uses Firebase for email based auth and Google auth and Hasura as GraphQL Api to access the database.

  • Fully functionable.
  • Clean and Simple Material UI.
  • Best and Clean Code Quality following Modern Android Development.

App Features

  • Onboardng – Quizzify has a beautiful user onboarding process.
  • User Authentication – Supports email based as well as Google authentication
  • Home – Home screen shows the top 5 popular community quizzes, option to start an Instant quiz and to join an exisiting quiz game using invite code.
  • Communtiy – Shows list of all community made quizzes with option to search and filter based on category. It also allows user to create a new community quiz.
  • Create Quiz – Users can create quizzes and contribute to the Quizzify community.
  • Favourites – It list all the quizzes the user has marked as favourite.
  • Profile – Shows user’s profile.
  • About – Shows information about the app like its version number and more.
  • Quiz Detail – Shows details of the quiz select and option to start game with friends as well as solo.
  • Game Screen – Screen where user plays the quiz in real-time with their friends

Insights into the app ?

Quizzify - slides.gif

Quizzify has a sleek, modern looking minimalistic UI which makes it easy for people of every age group to use. ?

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Quizzify has a easy and simple user onboarding process. ?

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Quizzify uses Firebase for authentication. It supports email-based authentication as well as Google authentication with upcoming support for Facebook auth.

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Select whatever quiz you want to play and have fun time with your friends and gain some more general knowledge while playing.

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Play quizzes in realtime with friends with live rank and score tracking and enjoy a simple and easy game experience.

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You can even create quizzes of your own and play with friends. So go on, create quizzes of your own and contribute to the Quizzify community.

? Screenshots

Technical details

  • Quizzify uses Firebase for user authentication, it supports email based authentication and Google authentication
  • Quizzify uses Hasura Cloud’s PostgreSQL as it’s primary database.
  • Quizzify uses Hasura’s GraphQL API to access the database and is much easier to work with compared to a REST interface.
  • Quizzify has full offline support, it uses Android’s ROOM database for caching all data offline.
  • Quizzify is made using Kotlin and following Modern Android Development practices.
  • Quizzify uses Kotlin Coroutines and Flow to handle all asynchronous tasks.
  • Quizzify uses all Jetpack libraries and follows MVVM architecture. It also has a G.O.A.T rating in Android’s M.A.D scorecard.
  • Quizzify’s code follows all the best practices and software development principles like SOLID which make it a very good learning resource for beginners as well as for people looking to improve thier software design skills.
  • Quizzify’s code is properly linted using Ktlint.


Built With ?

  • Kotlin – First class and official programming language for Android development.
  • Coroutines – For asynchronous and more..
  • Flow – A cold asynchronous data stream that sequentially emits values and completes normally or with an exception.
  • StateFlow – StateFlow is a state-holder observable flow that emits the current and new state updates to its collectors.
  • SharedFlow – A SharedFlow is a highly-configurable generalization of StateFlow.
  • Android Architecture Components – Collection of libraries that help you design robust, testable, and maintainable apps.
    • ViewModel – Stores UI-related data that isn’t destroyed on UI changes.
    • ViewBinding – Generates a binding class for each XML layout file present in that module and allows you to more easily write code that interacts with views.
    • DataBinding – Binds data directly into XML layouts
    • Room – Room is an android library which is an ORM which wraps android’s native SQLite database
    • DataStore – Jetpack DataStore is a data storage solution that allows you to store key-value pairs or typed objects with protocol buffers.
  • Dependency Injection
    • Hilt-Dagger – Standard library to incorporate Dagger dependency injection into an Android application.
    • Hilt-ViewModel – DI for injecting ViewModel.
  • Backend
    • Firebase
      • Firebase Auth – To support email based authentication and Google authentication
    • Hasura – Blazing fast API performance, that’s remarkably easy to scale
  • GSON – A modern JSON library for Kotlin and Java.
  • Apollo Kotlin – A strongly-typed, caching GraphQL client for the JVM, Android, and Kotlin multiplatform.
  • Timber – A simple logging library for android.
  • Retrofit – A type-safe HTTP client for Android and Java.
  • GSON Converter – A Converter which uses Moshi for serialization to and from JSON.
  • Coil – An image loading library for Android backed by Kotlin Coroutines.
  • Material Components for Android – Modular and customizable Material Design UI components for Android.

Package Structure

dev.vaibhav.quizzify    # Root Package
├── data                # For data handling.
|   ├── local           # Room DB, and its related classes
|   ├── remote          # Firebase, Hasura and their datasource implementation
│   ├── model           # Model data classes and mapper classes, both remote and local entities
│   └── repo            # Single source of data.
├── di                  # Dependency Injection             
│   └── module          # DI Modules
├── ui                  # UI/View layer
|   ├── adapters        # All Adapters, viewholder and diffUtils for recyclerViews
|   ├── screens         # All App Screens 
|   └── usecases        # Use-case classes
└── utils               # Utility Classes / Kotlin extensions


This app uses MVVM (Model View View-Model) architecture.

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