Verify Your App's Backward Compatibility

Make sure that your app will run well on its lowest targeted iOS version. Run Deploymate occasionally and before releasing. It will point out each potentially offending line, giving you a chance to replace it or make it conditional.

• "Deploymate helps you identify unavailable, deprecated and obsolete API usage in your Xcode projects"* - http://www.deploymateapp.com

At $19.99, it is worth getting at least one license for your team. If nothing else, it will rapidly give you an assurance that you have managed compatibility.