Import this project as maven project in your IDE and play around. In the Junit test classes, changed versions of the tested pages are mentioned, so you can easily switch between the versions.
You might also want to try out our Chrome Extension. You need to setup a free account with us to use it. You can e.g. compare the old budget with the new budget or the online version of the login page to the changed login page.
recheck-web can be used in conjunction with the Selenium IDE, to create tests quickly. As is shown in a some of the contained tests, you can even use recheck-web together with e.g. BrowserStack or Sauce Labs to do cross-browser testing or cross-device testing. Note that you need an account with each of them.
This project was mentioned in various articles, the latest of which is on opensource.com.
If you have any questions, please contact us at retest.de.