Cadence is a great bike computer alternative. I mount my iPhone onto my handlebars and can use my Varia (safety lane assist radar) and track speed, distance, heart rate, and traveling route. I have SRAM Rival electronic group and it’s compatible with my SRAM Rival power meter so I can track power output as well as cadence. I also will pair with my heart rate monitor (Polar H10) on workouts. I commute to work daily with my bike and it’s nice how you can directly save activities automatically to Strava and Apple Health with one tap after finishing workout.