Preview any URL across common Mac display sizes, stacked, scaled, and labeled.
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Tracked since2026
0 reviews trackedThe Bottom Line
Entry price
Free, no paid tier
Biggest pro
Completely free with no sign-up required
Biggest con
Cannot embed sites with strict X-Frame-Options or CSP policies
TL;DR - Studio Practice
- Simultaneously previews URLs across multiple Mac display sizes.
- Supports local development URLs for responsive design testing.
- Available as a free online tool or downloadable single HTML file for offline use.
Pricing: Free forever
Best for: Individuals & startups
What is Studio Practice?
Mac Screen Simulator is a free, no-sign-up tool designed for developers and designers to instantly preview how any website or web application appears across various common Mac display sizes. It displays a given URL simultaneously on virtual screens representing MacBook Air 13", 15", MacBook Pro 14", 16", and the 27" Studio Display 5K. The tool stacks, scales, and labels these previews, making it easy to identify the current display size you are viewing on.
This utility is particularly useful for front-end developers, UI/UX designers, and QA testers who need to ensure responsive design across different Apple desktop environments. It supports previewing local development URLs (e.g., http://localhost:3000), allowing for quick iteration and testing without deployment. The tool can be used directly online or downloaded as a single HTML file for offline use, offering privacy and portability as it contains no tracking.
While highly effective for most web content, it's important to note that some websites with strict security policies (like Google, Twitter, or banking sites) may refuse to embed. However, it generally works well for personal development projects and most public websites, providing a convenient way to check design responsiveness and layout consistency.
Available on: Web, macOS
Pros & Cons
Pros
- Completely free with no sign-up required
- Supports local development environments
- Offers offline functionality via downloadable HTML file
- Provides immediate visual feedback on responsive design across key Mac displays
- Privacy-focused with no tracking
Cons
- Cannot embed sites with strict X-Frame-Options or CSP policies
- Best viewed on desktop due to full Mac display sizes
- Limited to Mac display sizes, no other device types
Key Features
Simultaneous preview across multiple Mac display sizesSupports MacBook Air 13", 15", MacBook Pro 14", 16", and Studio Display 5KDisplays previews stacked, scaled, and labeledIdentifies your current device with a "Your screen" badgeAllows preview of localhost URLsDownloadable as a single HTML file for offline useNo sign-up or tracking required
Pricing
Free
Studio Practice is completely free to use with no hidden costs.
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Studio Practice FAQ
What specific Mac display sizes can I preview with this simulator?
You can preview your URLs across MacBook Air 13", MacBook Air 15", MacBook Pro 14", MacBook Pro 16", and the 27" Studio Display 5K, all simultaneously displayed.
Can I use the Mac Screen Simulator to test my local development server?
Yes, the simulator is designed to work with local development URLs, such as http://localhost:3000, allowing you to preview your work at every Mac size instantly without needing to deploy it.
Why do some websites, like Google or Twitter, not load in the simulator?
Some websites, particularly those with strict security headers like X-Frame-Options or Content Security Policy (CSP), prevent their content from being embedded in iframes, which is how the simulator displays the previews. Your own development work usually loads without issues.
Is there a way to use this tool without an internet connection?
Yes, you can download the entire tool as a single HTML file. Once downloaded, you can run it offline directly from your computer, making it convenient for travel or environments with limited connectivity.
What is the purpose of the "Your screen" badge?
The "Your screen" badge is a helpful indicator that highlights which of the simulated Mac displays matches the size of the device you are currently using to view the simulator, providing context for your testing.
Source: studiopractice.io