Browse Kotlin Multiplatform libraries

Create asynchronous client and server applications. Anything from microservices to multiplatform HTTP client apps in a simple way. Open Source, free, and fun!

Easiest HTTP networking library, leveraging coroutines for asynchronous operations. Supports custom configurations using OkHttpClient and NSURLSession, and fully compatible with R8/Proguard for Android.

Fetches metadata and thumbnails for digital comic libraries, updating series automatically or manually. Integrates directly into Komga and Kavita interfaces for seamless library management.

Advanced debugging and inspection tool enabling real‑time remote inspection of apps: captures network/WebSocket/GraphQL traffic, mocks requests, displays analytics, images, storage, preferences and database contents.

Monitors network requests and responses, enhancing debugging and analysis of client-server interactions. Features include header sanitization, log retention, and content length management with platform-specific integrations.

Real-time audio, video and signaling stack with WebRTC integration, CLI client (zcall), build tooling, static libraries and standards-compliant features like trickle-ICE, STUN consent freshness, data channels.

Generates code and runtime libraries from Smithy models, supporting various protocols, authentication, serialization, and observability, along with extensive testing and benchmarking modules.

Implements Agent Client Protocol for integrating AI agents, supporting client and agent capabilities, standardized AI interface, JSON-RPC handling, session management, and file operations. Includes examples and STDIO transport communication.

Personal cloud computer for storing photos, media and documents, running sandboxed WebAssembly apps (password managers, smart‑home, trackers), portable between hosts, pay‑as‑you‑go storage and backups.

Deploys the OSS Review Toolkit as a cloud service, offering Docker Compose setup for testing and plans for Kubernetes deployment. Supports Docker image publishing and OpenAPI specification generation.

Expose Compose UIs over a REST-like HTTP API for AI agents to inspect (semantic tree, screenshots) and interact (clicks, gestures, text), record GIFs, run headlessly without production changes.

Offers a cloud-based CI platform for testing and benchmarking code analyzers, including services for sharing tests, creating online demos, and participating in code analysis contests. Also features a platform for reporting and deduplicating vulnerabilities.

Simulates REST API endpoints with a local HTTP server for mobile applications, ensuring compile-time safety and offline functionality without relying on hosted solutions. Ideal for development and testing environments.

Monitors HTTP requests, records exceptions, and inspects Room databases in real-time. Offers Room database inspection and custom query execution. Inspired by Chucker, but extends functionality.

Generates HTTP client code at compile-time using annotations, inspired by Retrofit and Ktorfit. Features include no runtime dependencies, type-safe headers, and advanced customization options.

Simplifies unit testing of network requests by offering mock-like APIs compatible with various network libraries. Features `netmock-server` for localhost server testing and `netmock-engine` for lighter, library-specific testing with `MockEngine`.

Enhances persistent caching for HTTP clients using LRU eviction strategy, integrates with Ktor, supports fallback to in-memory cache, and allows custom cache directory configuration.

Facilitates extraction of comprehensive Google Play Store app data, including descriptions, developer info, categories, reviews, and metadata, using JSON parsing and HTTP requests.

Enables seamless file downloading, local saving, and opening through the system's default application, while abstracting platform-specific details for a streamlined experience.

Small library enabling efficient asynchronous peer-to-peer communication with type-safe contracts. Features include unidirectional remoting, Ktor transport adaptors, code generation, and extendable binary serialization.

Drastically speeds server development with high-level abstractions for databases, cache, email, SMS, and file storage; typed HTTP/WebSocket endpoints, auth flows, auto-generated docs and SDKs, Terraform output.

Multiplatform library facilitates interaction with Nostr, supporting event publishing, subscription requests, and relay communication through customized configurations and HTTP client integration.

Simplifies REST API communication and WebSocket management, offering unified network request handling, token-based authentication, localization, and advanced error handling with minimal setup.

HTTP request logger enabling storage, inspection, and export of network requests. Integrates seamlessly with OkHttp, yet compatible with any HTTP client.

Facilitates seamless stream extraction and video hosting downloads with custom server integration, coroutine-based architecture, and robust error handling. Features flexible HTTP client support and cookie management.

Enables seamless integration with Appwrite backend services using a user-friendly REST API. Simplifies app development through Android SDK, streamlining complex tasks while enhancing security and efficiency.

Shared transport and config for OpenAI APIs, offering typed and raw endpoints (chat, responses, embeddings, images, audio, files, realtime, fine-tuning) with multipart and websocket support.

Streamlines Vodacom Mozambique M‑Pesa C2B checkout by handling authentication, RSA encryption, HTTP orchestration, composable UI flows, input validation, and reactive transaction results with localized messaging.

Generates client code for Twirp services, integrating protobuf messages, JSON error handling, and HTTP support. Provides a runtime to configure Ktor HttpClient for seamless Twirp integration.

Web service for geospatial data access and management, offering GeoJson-based REST and Java APIs, Postgres support, data change event publishing, and customizable extension framework for integrations.