ChangeWindows let you easily check which version of Windows is available on each platform (PC, Mobile, Xbox, Server, Mixed Reality, IoT and Team) and provides you with detailed changelogs and more, all gathered in one nice web app. You may pay for ChangeWindows, but be aware that the trail never expires. Feel free to use that one as well. Paying is more of a donation-kind-of-thing.
Version 0.8.1 - Support for ChangeWindows 5 - Rebranded name for the official app - Updated icon - Windows 10 version 1709 and up is now required - Support for the light system theme in Windows 10 version 1903 - Fixes incorrect behavior when opening images where ChangeWindows would switch to the browser Version 0.4.4 - Fixes incorrect usage of the "ChangeWindows Preview" name - Fixes a bug that caused the app to crash on launch or get stuck at the splash screen Version 0.4.3 - Update for the Creators Update - Improvements for ChangeWindows.org 4.0 - Windows 10 version 1511 is now the lowest supported version - Updated logo resources Version 0.3 - Cortana integration! Ask Cortana to show you the release notes for the upcoming version of Windows. More commands are coming in the future! Version 0.2.1 - Minor changes to the meta data - Support for Xbox and Holographic Version 0.2 - Transparent Live Tile Version 0.1 - Initial release