Inspect every detail
Per-device DevTools, rulers and outlines. Find the issue right where it happens.
One page. Every screen.
A calmer way to build responsive websites.
All your previews, beautifully in sync.
A little support. A lot more possibility.
Less resizing.
More refining.
Everything you need to get the details right.
One change. Every viewport.
Scroll, click and type in one preview. The others follow. Compare your responsive layouts without the window shuffle.
Look beyond screen size.
Check dark mode, reduced motion, slow networks and more. Apply the same environment to every device in a few clicks.
Your devices. Your workspace.
Choose from grouped device presets, add custom sizes and save your favorite suites. Five canvas layouts make room for your workflow.
Capture the whole picture
Save a viewport or a full page. Capture every device at once when you're ready to share.
Start where you are
Production URLs, localhost or local HTML. Bring your work, keep your setup.
Keep your flow
Named suites, bookmarks and saved settings. A familiar workspace each time you return.
Room to focus.
Light or dark. Side by side or in a row.
Make space for the way you work.
A few things
you might wonder.
Is Respo really free?
Yes. Respo is free to download and use, with no account, subscription or paid feature unlocks. The desktop app is open source under the MIT license.
Which operating systems are supported?
The current release runs on Windows 10 and 11, on x64 PCs. There are no macOS or Linux installers yet. The MacBook images on this page are promotional mockups.
Can I preview localhost and local files?
Yes. Paste your local development URL, including its port, or open a local HTML file. Respo can reload local files when they change.
Does an iPhone preview run Safari?
No. Every preview uses Chromium. Respo emulates viewport size, pixel density, touch and device information. Use real devices and other browsers for final compatibility checks.
Does Respo collect my data?
Respo has no usage analytics, telemetry or automatic crash-report uploads. App settings, history and logs stay local. Sites you open still make their own network requests, and update checks connect to GitHub. You can disable automatic update checks in Settings.
Why does Windows show a security warning?
The installer is not code-signed yet, so Windows may show an unknown-publisher or SmartScreen warning. That warning alone is not a malware detection. Always download from the official Respo GitHub releases.
How can I support the project?
Give the app a star on GitHub, report a bug, or share Respo with someone who builds websites. You can also sponsor a spot on this page to help fund its continued development.
