ChromeVox is the built-in screen reader that comes as accessibility tool as part of Chrome OS. It is quite useful and with it’s range of shortcuts powerful for those who are visually impaired on blind. I was testing a website on my chromebook and found that it was there!
If you have a Chromebook and want to try it out. Press CTRL+ALT+Z to enable it and to unenable it repeat the CTRL+ALT+Z. Use TAB to step through the options , speech guides you through. Search + space acts like enter and the cursor keys navigate in detail around a menu. Here is the help section link