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.<p>For example, we can use Chrome Inspector's "Device" previews, but we run into the following:<p>- 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).<p>- You can’t see multiple viewports at once (and it’s cumbersome switching back and forth)<p>- When you notice a problem, there's no simple way to deep-link someone on your team to take a look at that viewport (likely have to open a Jira/Linear with the specifics)<p>- You can’t favourite viewports (for tracking the viewports specific to your project/client)<p>We’ve built a product with the goal of addressing these limitations (among others), and would love to hear your feedback.<p>Finally, feel free to use the open sourced data for your own projects :)