@ken luu It's not an Alfred feature, it's an Apple feature of macOS and iOS called Universal links. It lets developers associate web links with a particular app. Another example you may have already seen is with App Store and iTunes links. You'll notice if you try to open the App Store page for TickTick (https://apps.apple.com/ca/app/ticktick-to-do-list-calendar/id966085870?mt=12), it opens directly in the App Store rather than your browser. Or if you do paste that link directly in your browser, you'll see a popup asking if you'd like to open the link with the App Store.
Universal links and URL Schemes are both ways for apps to handle content rather than having the OS only load the link in a web browser.
