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icdiff

Instead of trying to be a diff replacement for all circumstances, the goal of icdiff is to be a tool you can reach for to get a better picture of what changed when it's not immediately obvious from diff.

icdiff is an excellent upgrade from the standard diff command line utility.

Even better, it is open source and written in Python.

The description from the website does an excellent job of descibing exactly why you should integrate it into your daily workflow:

Your terminal can display color, but most diff tools don't make good use of it. By highlighting changes, icdiff can show you the differences between similar files without getting in the way. This is especially helpful for identifying and understanding small changes within existing lines.