It's hard to say. Many factors can affect whether or not they work. Some people use Instagram bots because they find it challenging to grow their following organically. Still, the issue is that these applications are often made with sketchy code, and it can be risky to use them. I recommend waiting until you get more followers before you decide to start using one of these apps.
I didn't want to make this article all about the negatives of using bots, so I will say that there are also some great tools for people looking to grow their following less spammy.