There is an AP available on Android and Iphone. Android has a free and paid version. Paid version is ad free and $2.99.
Easy interface, shows a map with flags and below it list of business' and whether they are 2A friendly (green flag pro, red flag anti and white flag not yet rated)
Doesn't look like there is anyway to judge OC specifically, but when rating a business, there is a comment section which can be noted and viewed by others. I think this a great tool if enough people start to use it.
I've found these apps:
2AFriendy: Free and $2.99, for Android and iPhone. I think it's the best one of the bunch. I've never had any issues on my iPhone and their web search engine is good. If they make an option to enlarge the map it'll be better.
Posted: $1, for Android and iPhone. I never bought that one because there's no free version.
Gun free zone: free, for Android and iPhone. Really bad interface, crashes, controls are hard to press, looks like they use Google businesses
Safe to carry: free and $1, for iPhone. This one crashes, confusing interface, barely any businesses show up around me