[muzani]

I don't know if there is a hard part. Marketing is easy when the product is marketable. Development is easy when the required features are very clear.

The critical mistake many devs make is making something that just isn't very marketable. It might solve the problem, but say, the screenshots don't look very appealing. The marketer has to sit the customer down for 40 minutes to explain it. If it needs a video to explain, it's probably poorly designed.

Say, you're making a Pomodoro Technique app. It looks like a tomato. Color theme is tomato-like. It makes a ticking sound and a bell sound. There's an indicator of time left. You don't even need words on a page to market this to the target audience.

You can have a Pomodoro app that looks like a spreadsheet and plays some music instead of having a visual indicator. This is both harder to develop and harder to sell. It might do the same thing, maybe better! But it's hard mode.