The existence of a similar application can be a positive indicator that there is a market for your idea.
It's absolutely possibly to have similar products for the same market.
From there identify any pain points that you can use to provide a unique angle for your own product that the existing solution doesn't cover.
If anything build it out just for the learning experience.
But it shouldn't be instantly trashed due to another solution's existence. Just look at the signs and see if you can carve out your own piece of that user market.
We're a place where coders share, stay up-to-date and grow their careers.
We strive for transparency and don't collect excess data.