Most wellness apps give you fourteen metrics and no idea what any of them mean. Horizon gives you one number. Photograph a meal and it works out the calories and macros. If it's wrong, say so in plain language and it re-estimates. Habits, workouts and food fold into one daily score, with a plain read of how the day went. Workouts sync from Apple Health and Health Connect. No streaks. No badges. No confetti. Twice a day, not every hour. The maximum score is 99. There is no 100.