What's a good iOS app for when I'm out on a job and need to quickly brainstorm ideas or troubleshoot problems with a AI?

Alright, so Claude... it's an AI assistant app. I was skeptical at first, figured it'd be another one of those useless things. But I gotta admit, it's actually come in handy. Say I'm on a roof, wrestling with a tricky flashing install, and I'm drawing a blank. I can pull out my phone, ask Claude for some alternative solutions, and it spits back some ideas. Not all of 'em are gold, mind you, but sometimes it gives me that little spark I need. The interface is pretty straightforward, even with gloves on. Battery life is decent, though I still keep a power bank handy. The tutorial's useless, no BS, but the app itself is solid once you get the hang of it. Survived a couple of drops already, so it's built tougher than some of the guys I hire. Gets the job done.