The time in four large digits, each one a window onto a live fire. Hearth is inspired by Fireplace and draws its flames with the classic PSX Doom fire, computed live on your watch. The Doom fire is simple and efficient enough to respond to the world: the colder it is outside, the higher the flames; they burn low by day and high at night, following your sunrise and sunset; a touch of the screen or a flick of the wrist stokes them; and on color watches they lean with the local wind and stay upright as you tilt your wrist, like a candle. Six color themes (including your own), an "animate after a tap" mode that saves the most battery, a crackling fire sound on Pebble Time 2 and Pebble 2 Duo, and an optional backlight on Pebble Time 2 that flickers with the flames. Works on every Pebble, from the original to Round 2.