Should I charge or let users use the app for free and offer premium tier later

I had built an app for tracking screen time on MacOS. The goal was to nudge the user to take breaks and not do very long sessions. So pretty simple and straightforward functionality. And thats what makes me rethink the pricing of it.

If i put this app behind a paywall (within app store), would people really buy it. I feel this might be an app thats useful to very select audience. And the paywall might deter them from even trying.

So, I feel may be i should offer the app for free and let users try it and figure out monetization later.

What has been your thought process in pricing your app? Would love to know how to go about this.