Check out Siempo (www.getsiempo.com) - it's basically a software version of the Light Phone 2 (for Android only now).

We believe the launcher approach is the most effective way to solve the problem b/c it actually gets at the root cause, which is that the smartphone interface has no protections against the persuasive techniques of addictive apps. So we made a new interface that is less distracting and more intentional.

We just launched in the Play Store and would love your thoughts and feedback!