iPhone Chat App Development

I'm looking to purchase a ready-made iPhone chat application similar to Snapchat. The app must support disappearing messages and allow media sharing, such as photos and videos.

Key Requirements:
- Must have disappearing messages
- Must support media sharing
- High level of customization for new features

Ideal Skills and Experience:
- Experience in developing or customizing chat applications
- Knowledge of iOS app development
- Ability to add new features as per requirement
- Ready-made solutions preferred to stay within budget

Please share any existing solutions or applications you have.