A Kotlin Multiplatform SDK for Firebase, with a focus on Firebase AI (Generative AI) capabilities.

Module	Description	API Coverage
firebase-app	Core Firebase App initialization
firebase-ai	Firebase AI (Generative AI with Gemini)
firebase-auth	Firebase Authentication
firebase-firestore	Cloud Firestore (real-time database)
firebase-common	Shared utilities and types	—

• Android
• iOS (arm64, simulatorArm64)

Add to your gradle/libs.versions.toml:

[versions]
firebase-kotlin-sdk = "0.1.0"

[libraries]
firebase-app = { module = "dev.ynagai.firebase:firebase-app", version.ref = "firebase-kotlin-sdk" }
firebase-ai = { module = "dev.ynagai.firebase:firebase-ai", version.ref = "firebase-kotlin-sdk" }
firebase-auth = { module = "dev.ynagai.firebase:firebase-auth", version.ref = "firebase-kotlin-sdk" }
firebase-firestore = { module = "dev.ynagai.firebase:firebase-firestore", version.ref = "firebase-kotlin-sdk" }

Add to your module's build.gradle.kts:

kotlin {
    sourceSets {
        commonMain.dependencies {
            implementation(libs.firebase.app)
            implementation(libs.firebase.ai)
            implementation(libs.firebase.auth)
            implementation(libs.firebase.firestore)
        }
    }
}

See each module's README for detailed usage and examples:

• Firebase AI — Generative AI with Gemini (text generation, streaming, chat, content DSL)
• Firebase Auth — Authentication (email/password, social providers, phone, MFA)
• Firebase Firestore — Cloud Firestore (CRUD, queries, real-time listeners, transactions)

Add your google-services.json to your app module and apply the Google Services plugin:

// build.gradle.kts (project)
plugins {
    id("com.google.gms.google-services") version "4.4.2" apply false
}

// build.gradle.kts (app)
plugins {
    id("com.google.gms.google-services")
}

Add your GoogleService-Info.plist to your Xcode project and initialize Firebase in your app delegate:

import FirebaseCore

@main
class AppDelegate: UIResponder, UIApplicationDelegate {
    func application(_ application: UIApplication,
                     didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        FirebaseApp.configure()
        return true
    }
}

Copyright 2025 Yuki Nagai

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.