On your phone, and on the web.
The same NurtureNet on iPhone, on Android, and in a browser, with one account and nothing to keep in sync.
Log it where you are
A touch usually happens away from a desk. The iPhone and Android apps are the full product, so you can log the coffee while you are still in the café, and the web app is there for a longer sit-down with your network.
One account
Sign in with your email on any of them and your people, warmth, notes and history are the same everywhere. Free for your first five people; a subscription in the app lifts that.