Which app is better for maths?

I'm curious, when it comes to choosing an app for mathematics, which one do you believe stands out as the superior option? Are there specific features or functions that make one app more advantageous for learners of math compared to the others? Additionally, do you have any personal experience or recommendations that could sway my decision towards a particular app? I'm looking for an app that's engaging, effective, and ideally, tailored to my individual learning needs.