Mainframe turns your wrist into a green phosphor terminal: dot-matrix time behind scan lines, corner brackets framing the screen, and a status readout that keeps running. • Big dot-matrix time in green phosphor, with glow and CRT scan lines • STEPS — today's steps, a goal bar and the percentage of your step goal • HR — beats per minute from your watch's latest recorded heart rate • BODY — Body Battery, the latest value your watch recorded (it moves through the day as you spend and recover energy) • TEMP — current temperature from your synced weather, with the day's high and low • PWR — live battery level • Values you don't have yet print as "--" in their own slot; rows never jump around • Gently dims after a few seconds of idle; Always-On Display shows just the dot-matrix time on black, redrawn at most once a minute Mainframe asks for two permissions — Sensor History and Complications — both used for one number: Body Battery, read from what your watch already recorded, with the system Body Battery reading as a fallback source. Everything stays on the device: no collection, no upload, no GPS.

Initial Version