All of them are very common mistakes that when avoided can have a significant impact on the ROI. Even if it is just a side project app you should take promotion and marketing as part of the development of your app.
What worked wonders for some friends who launched a small pet project recently was to get very specialized and local blogs to publish a review of their app for the launch date. It's an easy way to reach an audience of potential early adopters.
What worked wonders for some friends who launched a small pet project recently was to get very specialized and local blogs to publish a review of their app for the launch date. It's an easy way to reach an audience of potential early adopters.