There are so many apps available for Chrome on Web Store, it would be great if Chrome allows to test some of those without installing, currently Chromium team is testing ephemeral apps experimental feature on beta, dev. and canary builds for that purpose. You can enable that feature and forget about installing apps as search for apps from app launcher on taskbar shows results from Chrome web store with "add" and "launch" buttons. There you go! click on "launch"  button to run any app without installing.

Run Apps in Chrome without installing

Here is how to enable ephemeral apps in Chrome beta, dev or canary builds 

  • Visit chrome://flags/#enable-ephemeral-apps in address bar
  • Click Enable button, restart browser.

chrome ephemeral apps

Click on Chrome App Launcher on taskbar, sign into your Google account and start typing for launcher to show results for apps fetched from web store.