This app was mentioned in 2 comments, with an average of 2.00 upvotes
Also, there is an Android app for Kill On Sight, on top of the web one.
I laughed when I saw this one; I am the guilty author the KOS Checker so here's a little bit of history:
I made and published that app in roughly 12h when I was living in Providence and was tired to pop up a browser window to check for KOS every time a neutral showed up and intel channels started panicking as a result.
It currently has a 186 active installs which is 185 more than I expected (in comparison, Evanova has more than 10K active users). It has never been updated (since November 2013), the icon is the shittiest icon you can find on Google Play and it relies on the most horrible practice to get data: scrapping HTML.
That was a fun little side project though.
Thanks to the 185 users for your uninterrupted faith.