Usertour is an open-source user onboarding platform. It allows you to create in-app product tours, checklists, and surveys in minutes—effortlessly and with full control.The open-source alternative to Userflow and Appcues

A Node.js module for in-App-Purchase for iOS, Android, Amazon and Windows.

Discontinued: A lightweight implementation of Android In-app Update

SDK for growing mobile in-app purchases

Flutter SDK for cross-platform in-app purchase and subscription infrastructure, revenue analytics, engagement automation, and integrations

Kommunicate.io Android Chatbot SDK

Novu documentation - The Masterpiece

In-app browser that uses WKWebView

This is a simple example for creating Custom In-App KeyboardView in Android

Kommunicate plugin for Ionic/Phonegap/Cordova

Detect Kakaotalk in-app browser

Resume in-app web browsing in the default web-browser of the continuing platform adopting handoff.

Implement Google Play in-app products and subscriptions on Android.

Laravel SDK for Novu

A simple javascript library to handle flash messages via Cookies

NuGet package that implementing native In-App Reviews within a MAUI application with debugging capabilities

Detect facebook in app browser

A collection of samples using the Accengage iOS SDK.

Simple iOS StoreKit library

In-app survey SDK for iOS, Android, and Web.