Mobile Health Companion

The screen a person opens every day

A wearable sends in dozens of values a day: step counts, heart rate, hours of sleep, plus the weight and blood pressure a person enters by hand. Put all of it on the home screen and what you have built is a wall of numbers that looks impressive and tells nobody what to do next. So the home screen answers three questions only: how far short of today's target you are, which way the last several weeks have gone, and what changed since last week.

The gap has to be written out as a number, the amount still left to reach today's target, rather than a ring that is partly full and leaves the arithmetic to the user. Trends have to be read over weeks rather than off a single day, because one short night says very little while a seven-day average that keeps falling says a good deal. And a day when the device sent nothing has to read as no data, not as zero: zero means the person did not do it, which is a different thing from taking the watch off to charge.

• The gap to target stated as a number, not left to be read off a ring
• Trends taken from multi-week averages instead of a single day's reading
• A plain summary of what changed since last week, in both directions
• Days with no data shown as no data rather than as zero
• Targets set per person, not one standard figure applied to everybody

Reminders that have to earn their place

This is where a lot of health apps die. They notify every day at the same hour with much the same message, the user switches notifications off within a few weeks, and after that nothing can reach them at all, including on the day there is something worth saying. So we treat the right to interrupt as a limited resource to be spent carefully, not a channel that stays open for anything.

A reminder that does go out has to be tied to a gap you can point at: a weekly target that is still behind with two days left, several short nights in a row, or something the person asked to be reminded to log and has not logged. The message says what can be done right now and carries the button that does it, rather than offering encouragement in the abstract. Around that sit a cap on how many go out in a week, quiet hours that are respected, and automatic backing off: if the same kind of reminder gets no response several times over, it comes less often. Delivery can be in-app or through LINE OA, whichever the person prefers.

• Reminders fired by an identifiable gap, not by the calendar
• Each message says what to do now and carries the button that does it
• A weekly cap on notifications, plus quiet hours
• Automatic backing off from reminders a person keeps ignoring
• The person chooses which subjects they hear about, and how
• Delivered in-app or through LINE OA

The watch and the phone doing different jobs

A watch face has room for one piece of information and one button. That leaves the watch three jobs: a glance at where today stands, a short prompt that arrives at the right moment, and logging something in a single tap, such as water drunk, medication taken, or a walk started. If a thing needs long scrolling or typing to answer, it did not belong on the watch in the first place.

The phone takes everything else: history, charts across weeks, correcting an entry that was wrong or logged twice, setting targets and reminder times, and the detail behind whatever the watch only glanced at. Both surfaces read and write the same records, so the number on the wrist never contradicts the number in your hand, and anything tapped while the watch is offline is held on the device and sent up on reconnect without being counted twice. iOS and Android are both supported.

• Watch: today's progress readable at a glance, on one face
• Watch: one-tap logging for water, medication or starting a workout
• Phone: history, multi-week charts and correcting wrong entries
• Phone: setting targets, reminder times and delivery channels
• Offline taps held on the device and synced later without double counting
• Both surfaces on the same records, on iOS and Android

Where AI genuinely helps, and the line we do not cross

AI does four things here. It writes the week up in plain Thai, saying what improved, what slipped and what is worth attention next week, in place of a seven-day table of figures. It reads several signals at once to point out patterns nobody spots looking at one chart at a time, for instance that the weeks with later bedtimes tend also to be the weeks with less morning activity, always naming the period the observation was drawn from. It answers questions about the person's own history, such as how many hours a night they averaged last month or how many days they reached their step target, from that person's records only, and says so plainly when there is not enough data to answer. And it reads meals from a photograph, the work we have already built into the HEALTH ME app, returning energy and nutrient values with a confidence level that the user can correct before saving.

Then there is the line. A system like this supports the person and the clinician looking after them; it does not diagnose. It does not tell someone what condition they have, it does not adjust medication, and it is not a substitute for being examined. A value outside its reference range is shown next to that range with a prompt to speak to a doctor, not with an explanation of what the number means. What the app is genuinely good at is getting somebody into the consulting room with a complete, readable record instead of a recollection of how the last month went. Who that record is shared with, for how long, and when that stops, is the user's decision.

• A weekly write-up in plain Thai that says what to do next
• Patterns across sleep and activity, with the period they were drawn from
• Questions answered from the person's own history, and told plainly when data is short
• Meals read from a photo, with energy and nutrients editable before saving
• No diagnosis, no medication changes, no substitute for being examined
• Out-of-range values shown with their reference range and a prompt to see a doctor
• The user decides who their record is shared with, and can stop it at any time