NextCompanion app
NextCompanion is Navigation tool that is open source under the GPL-3.0-only license. A minimalistic client for Nextbike. Still under early development, use withcare.
The app allows you to sign-in, see a list of bikes, rent one and return it.
The app is neither official, nor feature-rich. It also doesn't allow you to.
sign-up to nextbike or to delete your account, use GPS or read the news
feed. It was just tested for Norderstedt, so it's not guaranteed to work in
all areas. Also, the app has no support for flexzones.