I'll post my comment here, because I agree with everything written above and I wouldn't be able to state it as well as @danenania. As for pricing, I would add

I'll post my comment here, because I agree with everything written above and I wouldn't be able to state it as well as @danenania. As for pricing, I would add a second point of view: price the app in a sustainable way right from the start. Estimate the realistic number of subscribers you can get, and set the pricing so that you can continue to develop the app. Too many apps price themselves too low "because otherwise nobody will buy", and end up disappearing anyway, because they weren't able to survive on the small amount of money. I don't have experience with consumer subscriptions. I can only say that in the B2B SaaS world, I don't think you can build a sustainable business with pricing below $40/month. The consumer numbers are likely lower, because you can get more customers with a smaller support load. But I don't think $4/month is a realistic price point.