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Sizzy
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BrowserStack
Responsinator
U-Eyes: Mobile Device Simulator
A free Chrome extension that shows your site on desktop and mobile at the same time, in one tab — with synced scrolling, device-framed screenshots, and screen recording for responsive design work.

Website, pricing, platforms and company facts side by side.
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| Website | open-gpt.app | mobileview.app |
| Pricing | — | |
| Platforms | — | |
| Company | — | Startup from Germany · 1 - 9 employees · 2026 |
| Listed in | — |
In their own words, as submitted to SaaSHub.


No description of https://open-gpt.app/ yet.
Mobile View is a free Chrome extension that overlays a real device frame on top of any live page, so you can see the desktop and mobile (or tablet) layout at the same time, in the same tab. Scrolling, clicks and typing stay in sync between the two views. It's built for responsive web design work:...
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Mobile View — Preview your website across desktop, mobile and tablet
As answered by people managing https://open-gpt.app/ and MobileView.app.
MobileView.app's answer:
It's a Chrome extension (Manifest V3) built with vanilla JavaScript, HTML and CSS using the Chrome extension APIs. Screen recording uses the browser's native capture and WebCodecs APIs. The website is a static site.
MobileView.app's answer:
Web developers, front-end developers and designers who work with responsive layouts every day — plus freelancers showing work to clients, and anyone building a portfolio or GitHub README that needs clean device-framed screenshots.
MobileView.app's answer:
Most tools make you switch between desktop and mobile views. Mobile View shows both at the same time, in the same tab — a real device frame sits on top of the live page, and scrolling, clicks and typing stay in sync between the desktop layout and the device preview. It's a lightweight browser extension rather than a separate app or paid cloud service, and everything runs locally with no tracking.
MobileView.app's answer:
I'm a full-stack web developer, and I kept hitting the same friction: checking how a site looked on mobile while building the desktop version, and explaining responsive behaviour to clients over a call. Existing options either hid the desktop layout or felt clumsy, so I built the tool I wanted for myself — and turned it into a free extension when other developers kept asking about it.
MobileView.app's answer:
It's free, installs in one click, and works directly on any live page — no separate app, account, or cloud service. You get desktop and mobile side by side with synced interaction, clean device-framed screenshots, and screen recording for client demos, all locally in your browser with no analytics or tracking.
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