Have you validated that there is a need for this app already or is just something you think is a good idea? If it's the latter you may just be sinking time/mon

Have you validated that there is a need for this app already or is just something you think is a good idea? If it's the latter you may just be sinking time/money solving a problem nobody cares about. If it's the former, then you should go down the MVP route first and put together something that shows the value that your product will deliver. I've seen cases where people have done this with everything from sketches to powerpoint presentations. If you've identified the right audience who has the need you are fulfilling, they will get what you are going for even without a product. Also read this posts for additional inspiration: http://scalemybusiness.com/the-ultimate-guide-to-minimum-viable-products http://scalemybusiness.com/the-ultimate-guide-to-minimum-via... https://medium.com/p/ef3c2d02dc51 https://medium.com/p/ef3c2d02dc51 Lastly, about the point of the developer stealing your idea. If you've done your due dilligence in terms of asking for prior work, getting references etc then that in itself mitigates the risk. Over and above that, ask yourself why a (properly vetted) developer will risk their reputation and livelihood - everything that is steady and predictable in their lives to steal your unproven idea?