Microsoft’s Windows 10 Store doesn’t let users know whether apps are supported by developers or not. The only way that is possible is to know when was the last time it was updated. Windows phone 8.1 store had that useful feature that was later scrapped in the Universal Windows Store for Windows 10.
But a developers have made a user-friendly method for users to get the information about the store apps. The Website WP-Snitch earlier displayed only Windows 8.1 apps information is now updated to show the data for both Windows 10 and Windows Phone apps.
Just copy the URL of the store link on the website here.
Here’s a screenshot of what info this website shows to users: