UI Automation Tests
The most popular tool is SeleniumHQ. Since we do not have time to write the testing scripts, a high level wrapper of Selenium is more approachable.
For the local tests, we can use Katalon Recorder, which is a Chrome extension. Basically, it records all the operations done on your browser and repeats them.
For the production tests, I think Ghost Inspector will be a better option, and it provides 100 free test running monthly.
Another two popular options are BrowserStack and Sauce Labs, but they do not have free pricing plans.