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
Use MCP Tools for Mobile LWC and Offline Development (Beta)
Salesforce Mobile App Generation (Developer Preview)
Quick Start Tutorials
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Test Harness Compatibility

Test Harness is compatible with multiple versions of the Salesforce service. Some features of Test Harness can only be used with the latest release of Salesforce. Update older versions of Test Harness to the latest release.

Test Harness Versions

The latest version of Test Harness can be downloaded by following the instructions provided.

Salesforce Service Compatibility

For best results, always use the latest version of Test Harness with the latest release of the Salesforce Service. Don’t mix versions of Test Harness and releases of Salesforce.

Mobile Device Platform Compatibility

On Android devices, the Test Harness app is distributed as an APK that can be installed on emulators or physical devices.

Minimum SDK version: API 28 (Pie)

On iOS devices, the Test Harness app is distributed as an app that can be installed on simulators. Test Harness can’t be installed on physical devices.

Minimum iOS version: iOS 15.0