Is a mutual ND Agreement suitable for co-founders who've agreed to work under specific terms?

I do not believe you should incorporate your company yet as there is a chance you will scrap the idea or iterate on the assumptions after analysis. I suggest you run your initial testing on a very minimal MVP to see if there is interest. I would go further in saying that you should not even allow people to pay only have them click on the payment option because at that point you know that it would be a conversion. The ONLY thing you are proving with an MVP is validation of an idea. Only make the mousetrap front end and see if you can drive users to where you want and stop. Even if you frustrate some people, it was worth it as you now know for sure people will buy or do what it is you wanted. Schedule a call with me to find out more. God knows I have done this enough times. Good luck Josh

Non-disclosure agreements are very common. Know that a non-disclosure agreement goes both ways as well. A contract agreement should also protects you from the other party disclosing any trade secrets or know-hows that they may learn from working with you.

I developed and published mobile apps as an individual for several years, and only formed a corporation later as things grew and it made sense. As far as Apple's App Store and Google Play are concerned, you can register as an individual developer without having a corporation. I'd be happy to help further over a call if you have any additional questions. Best of luck with your mobile app!

This sounds as a deja vu to me. I have been in a similar situation back in 2000, we could only solve the issue thanks to a good mediator. However every situation is different and hence your route to a solution might be different. It also depends where you are in the world that defines how an email and/or verbal agreement might be a sufficient ground for legal actions. I am not a lawyer and can not judge that.

You should retain a lawyer, or another qualified individual, to act as the third party designee for the corporation (if you do not have a partner or co-owner who is a US citizen). The designee should prepare Form SS-4 (Application for Employer Identification Number) and Form 8821 (Tax Information Authorization) for the corporation’s president to sign and return.