I like it. The blog site that hosts it has a slightly strange menu, when at 'home' there are three links 'Blog', 'Apps', and 'Contact', when at Apps, there appears to be only 'Blog' and 'Contact', when at 'Blog', there appears to only be 'Contact'.

But the actual app, is great. I like the output, but I would consider sorting them into those dependencies which are up to date and those which are not.

If you really want some extra user-friendlyness and learn a bit of the github API, that would be a cool way to accept input. Instead of copy&pasting the pip-freeze output, how about just your github repository link, you could then search for a requirements.txt (or similar), OR a first effort at this would be to allow users to link to a requirements.txt file, for example one hosted on github.

Finally, what about a spin-off pypi library to do this? I'd love to be able to do this from the command-line inside my project's directory.