A small screen, one knob, and whatever I've been doing to it lately.
I kept picking up my phone to check one thing, like whether that plane overhead is going somewhere interesting, or whether it's going to rain, or what my first meeting is, and putting it down twenty minutes later having checked none of them. The phone isn't the problem. Everything on it is competing for you.
So I built the opposite: a box on my desk that does six or seven things, holds still, and never asks for anything. Turn the knob, look, get on with it.

One person, KML, in Amsterdam, in evenings, for about a year now. FlugVel is a personal project.
Got an idea, or found a bug? The support page reaches my inbox directly, and I do read all of it.
No app. Nothing to install on your phone, and nothing that stops working when I lose interest in maintaining an app.
No account with me. You set it up with your own services, over your own Wi-Fi, from a page the device itself serves.
No notifications. It never interrupts you. If you want to know something, you look at it.
No data through my server. Your flights, weather, calendar and notes go straight between the device and the services you chose. All my site ever sees is a check-in with a device ID, signal strength and firmware version, so it knows whether to offer you an update. The privacy policy spells it out.
Where the project actually is, newest first.
After a year of design, revisions and printing, the first prototypes are finished and boxed. They go out to a handful of people to live with for a while and tell me what's wrong with them. It's the only way to find out what a thing is actually like to own.