Google's project is based on Chromium's open-source DOM Distiller, meaning technical minds can poke around right in the code. Reader Mode for mobile devices has been lurking in the background of Chrome since late last year, and it's accessible by heading to chrome://flags#enable-reader-mode-toolbar-icon, hitting "Enable" and relaunching Chrome. The Reader Mode icon should pop up in your toolbar for applicable pages after that. On desktop, run Chrome with the --enable-dom-distiller switch to unlock the "Distill page" menu option. Happy reading!