There is no definite answer when it comes to whether or not you should create an app for your blog. The decision largely comes down to personal preference and what you feel your readers would benefit from.
If you have a popular blog with a large following, an app could make sense. It could allow you to provide more content, interact with your readers more easily, and gather more data about their interests.
On the other hand, if your blog is relatively new or doesn’t have a large following, an app may not be worth the investment.
Ultimately, it’s up to you whether or not to create an app for your blog. If you decide to go ahead with it, make sure you have a clear plan for how you will use the data collected and what benefits your readers will receive.