QuickDiff is a wrapper around the popular diff tool on Linux, designed to make viewing the changes between 2 blocks of texts more easy. This allows you to see the difference in text, lists, mails, config files, ...
It was created because I needed an easy way to see the difference between 2 blocks of text, but didn't want to use external services to use it. Since I often use this to diff config files or other "personal" stuff, I feel more confident that I do it on my own system, where I know all data is being deleted. I know it's still plain text, so don't use this for passwords, but at least it's not being stored on a remote system.
I can not guarantee you that I don't save your input (since that would mean I need to give you root access to my server), but I give you my word: your input is not being saved on the server, at all. I save it temporarily to 2 files, to diff them, then delete them aftwards.
It's a Work-In-Progress. It does what I need it to do, but it won't be perfect. If what you're diff'ing isn't top secret, mail me your 2 text-field contents via firstname.lastname@example.org so I can debug it further. If you have hints, either mail me or contact me via Twitter at @mattiasgeniar.