Mobile and Offline Developer Guide

Mobile App Development with Lightning Web Components and LWC Offline
Create Mobile-Ready Components
Use Mobile Device Features in Mobile Apps
Offline Considerations and Limitations
Offline Environment Details
Use Salesforce Features While Offline
Development Tools and Processes
Understand the Mobile Development Cycle
Set Up Your Development Environment
Preview Components on Mobile
Validate Lightning Web Components for Offline Use
Develop Offline-Ready LWCs with the LWC Offline Test Harness
Test Harness Overview
Install the Test Harness App
Test Harness Prerequisites
Test Harness Compatibility
Download and Install — Android
Download and Install — iOS
Use the Test Harness App
Debug Lightning Web Components
Debug Mobile Components
Customize the Offline Experience for the Salesforce Mobile App
Quick Start Tutorials
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Install the Test Harness App

Test Harness is distributed as an installable app package, not via the Apple App Store or Google Play Store. As a developer tool, it’s intended to be installed into and used with a working development environment. The installation process, prerequisites, and compatibility details are consequently a bit more involved than with a normal mobile app.