BrowserPage Alternatives & Competitors

The browser for ambitious web developers that want to 5× their quality and efficiency.

Key Polypane features:

Multi-View Testing Live Reloading Developer Tools Integration Accessibility Checks

paid Free Trial $9.0 / Monthly (Individual user)

The all-in-one toolkit for developers and designers to check, compare, and test screen dimensions for responsive design.

Key Screen Size Checker features:

Free and Accessible Easy to Use Multiple Device Presets Custom Resolution Support

Automated security scanner for LLM APIs — catch prompt injection, data leaks, and tool abuse.

Key PromptBrake features:

Security Tests Supported Providers CI/CD Integration Privacy & Security

Try for free paid Free Trial $49.0 / Monthly (Scout)

LT Browser is a free dev friendly browser for developers and testers. You can see mobile view of website on different screen sizes and resolution on 50+ pre installed view ports. You can build, test and debug your website faster then ever.

Key LT Browser by Lambdatest features:

Responsive Testing Pre-built Device Viewports Local Testing Network Throttling

Test your site at different screen resolutions & devices.

Key Multi Screen Test features:

Easy Access User-Friendly Interface Quick Results No Installation Required

Download Blisk - a browser for web developers. Blisk is a toolbox for development, debugging and testing: emulation, sync, analytics, and screenshots.

Key Blisk features:

Multi-device emulation Built-in debugging tools Automatic refresh Collaboration features

View multiple screen dimensions in one view.

Key Responsive Viewer features:

Device Simulation Multiple Viewports Custom Device Support Real-time Refresh

Viewport Sizer is a free handy tool for measuring your device's viewport sizes. Perfect for app and website developers, drag the window to view sizes.

Key The Viewport Sizer features:

User-Friendly Interface Instant Feedback Cross-Browser Compatibility No Installation Required

World’s first full-stack Agentic AI Quality Engineering platform.

Key TestMu AI (Formerly LambdaTest) features:

Selenium Grid For Mobile Web-Automation Testing Selenium Web Testing Automation Parallel Testing For Goto Market Launch API for Continuous Testing

Open Source freemium $15.0 / Monthly

BrowserStack is a software testing platform for developers to comprehensively test websites and mobile applications for quality. .

Key BrowserStack features:

Cloud-based Browser Extensions SaaS

Open Source freemium $29.0 / Monthly (Starts at single user plans and billed annually)

Develop responsive web-apps 5x faster!

Key Responsively features:

Multi-device Preview Open Source Sync Scrolling and Clicks Customizable Viewports

Open Source free

Compare tablets, laptops and phones side by side - find the perfect device with detailed specs comparison.

Key EasyCompare.app features:

Simple and intuitive interface Quick comparison creation Visual clarity Web-based accessibility

The browser for designers and developers.

Key Sizzy features:

Browser Synchronization Development Tools Integration Customizable Viewports Live Reload

paid $7.0 / Monthly

A browser extension for displaying responsive web-pages in a side-by-side views to quickly test how it looks at different resolutions and devices.