LT Browser is a developer-centric browser designed to streamline the process of building, testing, and debugging responsive websites. It enables users to view and interact with their web projects across more than 50 pre-installed device viewports, including various mobile phones, tablets, laptops, and desktops. With dedicated DevTools for each viewport, side-by-side device testing, and features like network throttling, bug reporting, and performance analysis, LT Browser provides a comprehensive environment for ensuring web applications render and function correctly on any screen size. It supports testing on locally hosted sites, custom device profiles, and integrates with popular project management tools for collaborative debugging and reporting. The tool is available for Windows, macOS, and Linux, and is free to use with optional paid tiers offering advanced features.

Key Features

Responsive Design Testing Test and debug websites across 50+ device viewports.

• Simulate real devices (phones, tablets, desktops)
• Side-by-side and simultaneous multi-device testing

Dedicated DevTools per Device Access Chrome DevTools for each device viewport.

• Inspect and debug for each simulated device
• Real-time changes with hot reloading

Custom Device Profiles Create and save custom device resolutions.

• Test unique screen sizes and orientations
• Support for landscape and portrait modes

Network Throttling Simulate various network conditions.

• Test responsiveness under slow or unstable connections
• Ensure performance for all user scenarios

Bug Reporting and Collaboration Capture, annotate, and share bugs easily.

• Screenshot and video capture
• Integrate with JIRA, Asana, Slack, and more

Performance and Accessibility Reports Generate Lighthouse reports for tested sites.

• Analyze performance, SEO, and accessibility
• Identify and address optimization areas

Localhost and Authenticated Testing Test sites before deployment, including behind login screens.

• No need for public deployment to test
• Supports testing of local development environments

Media Management Store and manage screenshots and videos from test sessions.

• Organize media for review and sharing
• Quick access to historical test data

Benefits

Accelerated Responsive Development Shorten the feedback loop for responsive design.

• Immediate visual feedback across devices
• Reduce manual device switching and setup time

Improved Debugging Efficiency Streamline issue identification and resolution.

• Simultaneous multi-device debugging
• Centralized bug reporting and sharing

Enhanced Collaboration Facilitate teamwork in development and QA.

• Easy sharing of annotated bugs and test sessions
• Integration with project management and communication tools

Comprehensive Testing Coverage Increase confidence in cross-device compatibility.

• Wide range of pre-installed and custom devices
• Network and performance simulation for real-world scenarios