# HarmonyOS Developer Documentation update_time: 2026-07-13 00:00:00 > HarmonyOS developer documentation index for LLMs, coding agents, and private knowledge-base ingestion. The index follows the live Doc Center navigation structure: level-1 categories contain level-2 documentation collections. ## Docs ### Release Notes - [Release Notes](https://developer.huawei.com/consumer/cn/llms/docs-release-notes.txt): Release Notes provide HarmonyOS version information, release changes, compatibility updates, historical versions, and documentation support information. ### Tools - [DevEco Studio](https://developer.huawei.com/consumer/cn/llms/docs-deveco-studio.txt): DevEco Studio provides IDE documentation, environment setup, project creation, debugging, build, testing, profiling, and tool usage guidance. ### Design - [Design](https://developer.huawei.com/consumer/cn/llms/docs-ux-design.txt): Design provides HarmonyOS design guidelines, UI patterns, interaction principles, visual foundations, multi-device design, and component usage guidance. ### Development and Testing - [Getting Started](https://developer.huawei.com/consumer/cn/llms/docs-getting-started.txt): Getting Started provides onboarding documentation for HarmonyOS development, including preparation, account setup, environment configuration, first projects, and basic workflows. - [Architecture](https://developer.huawei.com/consumer/cn/llms/docs-architecture.txt): Architecture provides solution design guidance, application architecture patterns, project structure, lifecycle design, modularization, and technical planning documentation. - [Capabilities](https://developer.huawei.com/consumer/cn/llms/docs-capabilities.txt): Capabilities provide HarmonyOS open capability documentation, including system features, kit capabilities, service integration, permissions, and scenario-based API usage. - [Celia](https://developer.huawei.com/consumer/cn/llms/docs-celia.txt): Celia provides documentation for the Xiaoyi open platform, including intelligent assistant capabilities, integration workflows, service access, and development guidance. - [Atomic Service](https://developer.huawei.com/consumer/cn/llms/docs-atomic-service.txt): Atomic Service provides documentation for developing HarmonyOS atomic services, including service creation, UI design, lifecycle, distribution, and best practices. - [Games](https://developer.huawei.com/consumer/cn/llms/docs-games.txt): Games provide HarmonyOS game development documentation, including engine integration, rendering, performance, input, distribution, and game-specific capabilities. - [Testing](https://developer.huawei.com/consumer/cn/llms/docs-testing.txt): Testing provides HarmonyOS test documentation, including unit testing, UI testing, automation, debugging, quality checks, and test tool usage. ### Submission, Distribution, and Operations - [Submission](https://developer.huawei.com/consumer/cn/llms/docs-submission.txt): Submission provides AppGallery submission documentation, including application preparation, package upload, review requirements, compliance, and release workflows. - [Distribution](https://developer.huawei.com/consumer/cn/llms/docs-distribution.txt): Distribution provides application distribution documentation, including release management, channels, packages, certificates, rollout, and AppGallery Connect workflows. - [Operations](https://developer.huawei.com/consumer/cn/llms/docs-operations.txt): Operations provide application operations documentation, including user growth, analytics, service management, lifecycle operations, and post-release management. ### Troubleshooting and Operations - [Tools FAQ](https://developer.huawei.com/consumer/cn/llms/docs-tools-faq.txt): Tools FAQ provides troubleshooting documentation for HarmonyOS development tools, including IDE issues, build errors, debugging problems, and common tool workflows. - [Development and Testing FAQ](https://developer.huawei.com/consumer/cn/llms/docs-dev-faq.txt): Development and Testing FAQ provides answers to common HarmonyOS development, testing, debugging, API usage, and compatibility issues. ### Best Practices - [Advanced Features](https://developer.huawei.com/consumer/cn/llms/docs-advanced-features.txt): Advanced Features provide documentation for innovative HarmonyOS capabilities, new scenarios, advanced integrations, and feature-oriented development practices. - [Multi-Device Development](https://developer.huawei.com/consumer/cn/llms/docs-multi-device.txt): Multi-Device Development provides documentation for cross-device HarmonyOS experiences, including distributed capabilities, adaptation, collaboration, and device-specific design. - [Scenario Practices](https://developer.huawei.com/consumer/cn/llms/docs-scenario.txt): Scenario Practices provide practical HarmonyOS development guidance organized by application scenarios, implementation tasks, and end-to-end feature workflows. - [App Security](https://developer.huawei.com/consumer/cn/llms/docs-app-security.txt): App Security provides HarmonyOS application security documentation, including permissions, privacy, data protection, secure storage, authentication, and compliance guidance. - [App Quality](https://developer.huawei.com/consumer/cn/llms/docs-app-quality.txt): App Quality provides quality engineering documentation for HarmonyOS applications, including performance, stability, compatibility, reliability, and release quality practices. - [UI Development](https://developer.huawei.com/consumer/cn/llms/docs-ui-dev.txt): UI Development provides HarmonyOS UI implementation guidance, including ArkUI development, layout, components, styling, interaction, and interface adaptation. - [Feature Development](https://developer.huawei.com/consumer/cn/llms/docs-feature-dev.txt): Feature Development provides practical documentation for implementing HarmonyOS application features, including common modules, workflows, integrations, and sample-based guidance. - [Engineering Tools](https://developer.huawei.com/consumer/cn/llms/docs-engineering-tools.txt): Engineering Tools provide documentation for development efficiency tools, build tooling, diagnostics, automation, DevEco toolchains, and engineering workflows. ### Industry Solutions - [Industry Solutions](https://developer.huawei.com/consumer/cn/llms/docs-industry-solutions.txt): Industry Solutions provide HarmonyOS solution documentation for vertical industries, including scenario solutions, integration patterns, and industry-specific development guidance.