Dev tools · September 25, 2024
Test your website on 180+ device viewports (with multi-device mode)
Hey HN! We do a lot of frontend testing, and one thing we find frustrating is the limited tooling available to observe how a URL renders on different viewports/devices simultaneously. For example, we can use Chrome Inspector's "Device" previews, but we run into the following: - Chrome doesn't keep those devices/viewports up to date, and adding new ones is pretty annoying (we've open sourced our collection of 180+ viewports/dimensions under MIT). - You can’t see multiple viewports at once (and it’s cumbersome switching back and forth) - When you notice a problem, there's no…
Test your website on 180+ device viewports (with multi-device mode) launched on September 25, 2024 with 74 votes, #543 of 5,281 launches that month and more than 90% of that year's launches. The site was still online in September 2026, 2 years on.
In plain words
Viewport Tester allows frontend developers to simultaneously view how a website renders across 180+ device viewports and screen sizes. Rather than switching between single previews in browser developer tools, users can see multiple layouts at once, save favorite viewports for their projects, and share deep links with teammates to specific viewport configurations. The tool maintains an up-to-date device library and simplifies responsive design testing and debugging workflows.
written from the facts on this page · September 2026
From the sources
Test your website with 180+ different viewports and device dimensions.
To continue enjoying full, unrestricted use, please sign up for updates. Unfortunately, Viewport Tester doesn't currently work on mobile. But we've put together the video below to show you how it works: Please enter your License Key below to upgrade your account. However to have this work properly (e.g. event relaying and iframe reloading), please add the following two lines of code into your local environment: This is a one-time (lifetime) upgrade, for $49. It gives you unlimited access to Viewport Tester and all our upgraded features. We built this tool to simplify our front-end testing, providing an alternative to downloadable viewport testing tools. Using Viewport Tester, you can link…from viewport-tester.com
In the maker’s words, at launch
Hey HN! We do a lot of frontend testing, and one thing we find frustrating is the limited tooling available to observe how a URL renders on different viewports/devices simultaneously. For example, we can use Chrome Inspector's "Device" previews, but we run into the following: - Chrome doesn't keep those…
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