What's a good banking app for keeping an eye on my money and not getting screwed over by fees?

Look, I need a bank that's like a good hammer – reliable and doesn't break the first time you use it. Varo's been decent so far. I can check my balance without driving to some branch, and they ain't hit me with any of those sneaky fees banks love to tack on. The app itself is pretty straightforward; not exactly built like a brick house, but it hasn't crashed on me yet. One thing, though: this thing sucks down battery life like a crew of guys on a hot day. Gotta keep a charger handy. Still, for simple banking, it gets the job done without the runaround.