What's a good Android app for keepin' track of when I can donate plasma and get paid?

Look, I ain't gonna lie, the OctaApp ain't winning any design awards. The tutorial's useless, but once you figure it out, it does what it's supposed to. I use it to schedule my plasma donations 'cause, hey, extra cash is extra cash. It shows me when I'm eligible to donate again, which is handy 'cause I forget. Plus, it keeps a record of my payments, so I can see how much I've made. It's not built like a brick house, and I wouldn't trust it in a monsoon, but for scheduling and payment tracking, it gets the job done. Just wish the battery drain wasn't so bad; gotta keep a charger handy.