I've worked on a consumer [mobile app](https://itunes.apple.com/app/apple-store/id1214741326?mt=8) so not everything will be directly applicable to you, but these two things helped me promote my app in the very early phase:

1. Sending DMs to hypothetical target users: I did this primarily on IG. I checked out popular accounts in the space my app was in (e.g., fashion), checked who liked their popular feed posts, and then DMed those people directly. I heard back from a significant number of people and got useful data about the market. This didn't confirm my product added real value, but helped me realize some of the target demographics I had in mind weren't a good fit for my product. One caveat is that I did this many years ago when IG didn't "hide" DMs from unrelated accounts under a tab.
2. At least for my product, almost all my best users/customers came through their organic searches in the App Store. So, ASO (App Store Optimization) worked well for me. I guess SEO is analogous to it, which has been discussed above. One additional thing maybe is that I'd recommend setting up analytics and start measuring retention early. Eventually, I think you will be interested in identifying long-term users and learn more about them.

Senior Software Engineer at Lookscope

Jay Son

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