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The app has two ways to measure how many seconds a day a watch is fast or slow. Both start on a watch's page, in the Accuracy section, and need no other equipment:

• "Check by sound" listens to the watch through the microphone of your iPhone. The watch is held against the iPhone for one minute, and the result gives the seconds a day, the beat error and the beats an hour.
• "Check by two readings" compares the time the watch shows with the clock of your iPhone, which iOS normally sets automatically. It uses two readings, taken any time apart.

Settings also has both, under "Time and accuracy", in "Accuracy checks", a list of every watch. While a check by two readings is in progress, a stopwatch button on Today opens it. Every result is kept with its watch. Accuracy results are for information only. They are not a test of a watch's condition. Only a watchmaker can judge a watch's condition.

No. The results of both checks are for information only. They are not a test of a watch's condition. A watch can be fast or slow for many reasons, and neither check can see inside the watch. The app shows each result as it was measured and does not say whether a result is good or bad. Only a watchmaker can judge a watch's condition.

"Check by sound" opens a screen that listens to the tick of the watch through the microphone of your iPhone. Listening starts when the screen opens, and a line of dots shows the ticks as they are heard. A result appears after about 10 seconds of steady sound. The check finishes by itself after 60 seconds of steady sound, with one vibration on an iPhone, and "Save result" keeps the result. "Save now" keeps a result before that, and the result then says how many seconds of sound it was measured from. A result such as *Fast by 3.7 seconds a day* comes with the beat error and the beats an hour.

Lay the watch flat on a table, with the dial facing up. On an iPhone, lay the iPhone flat beside it, with the bottom edge of the iPhone, where the microphone is, touching the side of the case at the crown. The sound of the watch travels through the case, as it does to a timing machine, which holds a watch by the sides of its case. On an iPad, hold the top edge of the iPad, where its microphones are, against the side of the case at the crown. Keep the watch and the device still for the whole minute, in a quiet place. On a Mac, the built-in microphones are made for voices and may not hear a watch; a microphone plugged into the Mac can be used instead, chosen in System Settings, under Sound, as the input. The result is for the position the watch is held in.

The app gives a result only when the ticks it hears are steady. A watch that moves, a watch held away from the microphone, or noise nearby can make the tick unclear. If this happens after a result is shown, the result from the steady sound before stays on the screen, and "Save now" can still save it.

The balance of a mechanical watch swings one way and then back, and each swing makes one beat: a tick, then a tock. Beat error is how far the tick and the tock are from being evenly spaced, in milliseconds (ms). Beats an hour is how many beats the watch makes in one hour, such as 21,600 or 28,800. The app finds it by itself, from 14,400 to 36,000. Neither figure is called good or bad by the app.

No. The sound is turned into numbers in the memory of your iPhone while the "Check by sound" screen is open, and it is never recorded, kept or sent. Listening stops when the screen closes, when you leave the app, when the iPhone locks and when a call starts. Only the result is kept, with the watch. The app asks for the microphone the first time, and access can be turned off at any time in the Settings app of the iPhone. The check by two readings does not use the microphone.

The microphone of each iPhone has its own clock, which can run slightly fast or slow. The app measures this clock while it listens and corrects the result for it, so there is nothing to set. The measurement is kept on that device only and is not synced, and each check by sound adds to it.

When the watch's seconds hand reaches 12, at any minute, tap "Seconds hand at 12". The reading is taken at the moment your finger touches the button, and "Take reading again" clears a tap that was early or late. The app then asks which minute the watch showed, and "Save first reading" keeps the reading. The second reading is taken the same way, shows the result, and "Save result" keeps it.

The tap gives the seconds, and the minute completes the reading. The app fills in the minute it expects, and − or + changes it if the watch showed another minute. The hour is not used, so the watch does not have to be set to the correct time. A wrong minute makes the total wrong by 60 seconds.

Nothing on the reading screen counts down, ticks or vibrates, so your tap follows the watch and not the phone. With a countdown, the tap would follow the phone, and every watch would seem exact. Set a watch, a separate page, has a countdown and, on iPhone, a vibration at :00. It can be used to set a watch to the second before a check.

The two readings can be any time apart. Longer checks give a more reliable result, because the small error of the two taps is spread over more time. The result is correct only if the watch does not stop and is not set before the second reading. Because the hour is not used, the result is also correct only while the total gained or lost is under 30 minutes, which a watch fast by 5 seconds a day reaches after about one year.

A result such as *Fast by 6 seconds a day* or *Slow by 6 seconds a day* says how fast or slow the watch was, on average, for each 24 hours between the two readings, compared with your iPhone. From 24 hours apart it is given to the nearest second, and from 10 days apart to 0.1 seconds. The grey line under it gives the total gained or lost, the time between the readings, and on how many of those days the watch was recorded worn.

From 3 hours apart, when the total is 2 seconds or more, the result is a rounded daily figure, such as *Fast by about 20 seconds a day*. It is rounded because the small error of the two taps matters more over a short time: to 10 seconds a day from 3 hours, to 5 from about 5 hours, and to 2 from 12 hours. Under 3 hours, or with a total under 2 seconds, the result is the total only, such as *Gained 2 seconds in 1 hour*.

A wrong result can come from a watch that stopped or was set between the readings, a tap made several seconds early or late, or a wrong minute. The app cannot see the watch, so it cannot always tell. When a result is more than 60 seconds a day, and the total is 5 seconds or more, the app says that this is more than most watches gain or lose. If the clock of your iPhone was changed between the readings, the app says so when it can tell; it cannot tell after a restart of the iPhone, or when the change is only a few seconds for each day between the readings.

No. A change of time zone or daylight saving time on your iPhone between the readings does not change the result, because the app reads both readings in the time zone of the first reading. This is also true for time zones such as those of India (GMT+5:30) and Nepal (GMT+5:45). Setting the watch to the new time makes the result wrong, unless only the hour hand moves and the watch does not stop.

By two readings, yes: any watch with a seconds hand can be checked, quartz or mechanical. Over a short check, the total of a quartz watch can be smaller than the small error of the two taps. Longer checks give a more reliable result. From 10 days apart, the result is given to 0.1 seconds a day. The check by sound is made for mechanical watches, from 14,400 to 36,000 beats an hour, and not for a quartz watch.

A timing machine listens to the tick of a watch for a short time, often in several positions, such as dial up and crown down. The check by sound works in the same way, in one position: the position the watch is held in against the iPhone. A watch is often fast in one position and slow in another, so a result by sound can differ from a timing machine's result in another position, and from one check by sound to the next. A timing machine also shows amplitude, the swing of the balance. The check by sound does not measure it.

The check by two readings does not listen to the watch. It compares the time the watch shows with the clock of your iPhone, over the whole time between the two readings, in every position the watch was in. Its result includes everything that happened to the watch in that time. The two checks measure different things, so the app keeps their results apart and never combines them.

Every saved result is kept. A watch's page shows the newest result of each check, and "All results" opens a list of every result for that watch, newest first, with the kind of check at the start of each row. The list has no average and no chart, because each result by sound is for one position, and the two checks measure different things. To remove a result, slide its row to the left, or tap "Edit", then confirm with "Remove result". "Undo" puts it back.

The results of both checks, and a check by two readings in progress, are kept with the watch in the app, and they are never sent to us. If Sync across devices is on, they are kept in your own private iCloud with your other records, so a check by two readings started on your iPhone can be finished on your iPad or Mac. They are also in the backups the app makes, and in Apple's backup of your device if it is backed up to iCloud. No sound is kept, only the result of a check by sound.

Watch Vault Tracker records which watch you wear each day, with one tap on its photograph. It is an app for iPhone, iPad and Mac with Apple silicon, free for 30 days and then a one-time licence to add more watches, published by Aveneg Technologies, LLC, and there is no Android version. It has no account and no sign-in, no server of ours and no advertising, and it works without an internet connection.

The first screen of Today has "Add a watch", and Collection has "Add watch" at the top. A maker and a model are enough. A nickname, a reference, a category and a photograph can be added at the same time, or later with "Edit" on the watch's page.

In "Add watch" or "Edit watch", "Take Photo" uses the camera, "Choose from Photos" uses Apple's photo picker, and "Choose from Files" opens an image file from Files, iCloud Drive or Downloads. "Crop" opens the photo already placed, to crop it again. Photos are shown square: dragging the photo moves it, and pinching it or the "Zoom" slider scales it; the part inside the square is kept, and "Use photograph" keeps it. Only the square is kept, so "Crop" on a saved photo crops within that square. A Mac does not show "Take Photo".

Yes. On the first screen of Today, "Import watches" opens Settings, where "Spreadsheet" reads a CSV file and the Watch Vault Archive row reads a file from that app. Both show the watches for review before anything is saved. The group Watch Vault Archive and spreadsheets, below, has the details.

Settings opens from the gear button at the top right of Today. There, under "Display", "Watches side by side on Today" can be "One", "Two" or "Three", and "Appearance" can be "Light", "Dark" or the same as the device. On iPhone, at the largest text sizes, Today shows one watch across while the phone is upright. On an iPad or a Mac, a wide window shows more watches side by side.

Tap its photograph on Today. The ring under the photograph becomes a brass tick, and the watch appears under "Worn today" at the top of the screen. The time of the tap is recorded, and the part of the day is read from it.

After each tap, a message names the watch and says what was recorded, such as *Recorded this morning*, and "Undo" in it takes that wear back. The message does not close by itself after a few seconds: it stays until it is used, the screen is scrolled, or another message takes its place. Later, the brass tick under the photograph takes back the most recent wear of that watch that day, also with "Undo".

A watch stays on until another watch is recorded, so a second tap on the watch that is on adds nothing, and the message says *Already on since this morning*. "Record again" in the message records it anyway. A watch counts as one wear for each day, however many times it is recorded.

Yes. Tap each watch when it goes on. A watch is taken to be on until another watch is recorded that day, or the day ends, so each one is shown for the parts of the day it was on. Each watch counts as one wear for that day.

Morning runs from midnight to noon, Afternoon from noon to 18:00 (6:00 PM), and Evening from 18:00 to midnight. A watch has the part of the day it was tapped in, and a later part when it was on for at least one hour of that part; the watch still on also has the present part. "Edit wear" says which parts were worked out in this way, not recorded, and each part has its own switch.

When a new watch ends the time that the watch before it was on, and that watch is now shown for a part of the day it was not tapped in, the message says so, such as *… is shown for the morning and afternoon*. Its button, such as *Morning only* or "As recorded", shows that watch only for the parts it was tapped in. "Undo" then puts it back as it was. This message has no "Undo" for the new wear; the brass tick under its photograph takes it back.

Above the watches on Today, choose "Yesterday", or "Add day" for another date. The top of the screen then says "Recording for" and the date, and "Morning", "Afternoon" or "Evening" can be chosen for the next tap; with none chosen, no part of the day is recorded. "Today" goes back to today, and so does leaving the app and opening it again.

Yes. Under the watches on Today, "No watch worn" records that no watch was worn that day, and "Undo" in the message takes it back. It is shown only while the day has no wear; for an earlier day, choose "Yesterday" or "Add day" first. Recording a watch on that day replaces it. A day with neither is not recorded. History shows a day with no watch with a short dash, and Insights counts it under "Days recorded", with the days with no watch under the figure. It is optional; leaving a day empty changes nothing.

From the 1st to the 7th of a month, Today can show last month's record: how many days had a watch, how many had no watch, and which days are not recorded. Each day not recorded opens that day on Today, so it can be recorded. It is not shown when every day has a record, or when nothing was recorded that month, and days before the first day recorded are not counted. The ✕ closes it until the next day. "Close until" and the next month's name closes it for the rest of the month. "Monthly summary in Settings" opens "Reminder and summary" in Settings, where "Monthly summary" turns it on or off on that device.

Tap the watch's line in "Worn today" or in History to open "Edit wear". It changes the watch, the date, the parts of the day and their clock times, and "Save" keeps the change. Turning off one part of the day removes only that part. "Remove from this day" takes the watch off that day, after a question that names what goes.

On iPhone and iPad, a press and hold on the app's icon on the Home Screen lists the three watches most recently worn, and last the watch on Today that has gone longest without a wear. Choosing one opens Today with the wear recorded and "Undo" in the message.

In Settings, under "Reminder and summary", "Daily reminder" sets one notification a day, at the time chosen. It says "Nothing recorded for today." and does not appear on a day with a watch already recorded, or a day recorded as "No watch worn". Its one button, "Record the last watch worn", records the watch worn most recently, and works only once the device is unlocked. The button names no watch, so a locked screen does not show which watches you own. The reminders are set for the next 30 days each time the app is opened. With Sync across devices on, a wear recorded on another device stops the reminder once the app has been opened on this one.

No. A wear keeps the date and the time zone of the place where it was recorded. A watch recorded at 23:00 in New York stays on that date after a flight to Tokyo.

Yes. It has one job: recording the watch you wear today, with one tap on your wrist. It lists your watches with their photographs, in the same order as Today on your iPhone, and a brass tick marks the ones recorded today. It comes with the iPhone app. It usually appears on your watch by itself a few minutes after the iPhone app is installed. If it does not, open the Watch app on your iPhone. Under Available Apps, tap Install next to Watch Vault Tracker. Settings in Watch Vault Tracker on your iPhone says whether it is on your watch.

Tap the watch you are wearing, and it is recorded for today, as a tap on Today records it. To take a watch off today, slide its row to the left and tap Remove. History, Insights, the accuracy checks and editing stay on the iPhone.

The list comes from your iPhone, so it is up to date when the two are connected. A tap made while the iPhone is away waits on the watch, and is recorded when they connect again, at the time you tapped. The watch and the iPhone talk over Apple's own connection between them, not through iCloud and not through a server, so it works whether or not Sync across devices is on.

History shows every day with a wear, or recorded as "No watch worn", as a month or as a list, with one line for each watch on each day. In the month, tapping a day lists its watches under the calendar; "List" and "Month" at the top change between the two, and the list has "Go to a date". At the largest text sizes, History shows the list.

Tapping a watch's line opens "Edit wear". Sliding a line to the left offers to remove that watch from that day, after a question, and the message that follows has "Undo". A wear for an earlier day is added on Today, with "Yesterday" or "Add day".

In Insights, a wear is one watch on one day, so a watch worn all day, or recorded three times, counts once for that day. "Wears", "Days recorded", "Watches worn" and "Your collection" cover the period chosen at the top: "Last 7 days", "Last 30 days", "Last 90 days", "This year", a past year, or "All time". "Your collection" counts the watches on Today, such as *20 of 30 worn*; watches hidden from Today are not counted in it.

A watch's page has "Leave out of Insights", which takes the watch out of every figure, while its records stay in History. Insights then says how many watches are left out, and "Include in Insights" brings the watch back. A watch hidden from Today is not counted in "Your collection", but its wears are counted in the other figures.

On the watch's page, the menu button at the top right has "Edit", for the nickname, maker, model, reference, category, status and photograph. When a watch has a nickname, the nickname is its title, and lists show its maker and model.

"Hide from Today" takes a watch off Today and keeps its history; Collection lists it under "Hidden from Today", and "Show on Today" puts it back. "Delete" removes the watch, its photograph and its wearing records, and it cannot be undone, so, for a watch that has wearing records and is not hidden from Today, the question before it offers "Hide from Today instead". Both are in the watch's page menu, and in Collection by sliding a row to the left.

Its "Status", in the watch's page menu or in "Edit watch", records how it left: "Sold", "Traded", "Gifted / donated", "Lost", "Stolen" or "Destroyed / discarded". The watch then leaves Today and is listed in Collection under "No longer in the collection", with its history kept. Setting the status back to "Owned" puts it on Today again.

Pinned watches come first, then the watches worn on the most days in the last 90 days. A press and hold on a photograph, or the watch's page menu, has "Pin to the top of Today" and "Unpin from the top of Today". The order stays the same while Today is on the screen, so a tap never moves the watches; it is updated when the app is opened again, and when a watch is pinned or unpinned.

Tap "Edit" at the top of Collection and drag the watches, or press and hold a watch for "Move to the top", "Move up" and "Move down". Each group keeps its own order, A to Z until it is arranged, and a new watch goes first. The order in Collection does not change the order of Today.

It is in the watch's page menu, for one watch that was added twice. It moves the wearing records of this watch to the watch chosen, then removes this watch and its photograph, after a question that gives the number of records. It cannot be undone.

Set a watch is a page for setting a watch: the time to the second, with a ring that fills over each minute, the weekday and the date, a second time zone, and the moon phase. It opens from the date and time at the top of Today, and from Settings, under "Time and accuracy". The screen stays on while the page is open.

The time and the date come from the clock of your iPhone, which iOS normally sets automatically. The app makes no connection to set the time, and the moon phase is calculated on the device.

On iPhone, the phone vibrates once at :00 of every minute while the page is open, and the line under the ring, "Vibrates at :00", counts down the last five seconds. The vibration marks the start of each minute, so a watch stopped with its seconds hand at 12 can be started exactly on the minute. An iPad and a Mac do not vibrate, so they show the ring only.

The second time zone is "GMT" until another is chosen: tapping its row opens a list of cities, with a search. It is shown on the 24-hour clock, as a GMT hand reads it, with the season, such as "Standard time", for a zone that changes. The choice is kept on that device only.

Under the date, the page gives the next change of daylight saving time where the device is, such as *Daylight saving time ends on Sunday, November 1.* In the last week before the change, it counts down the days and gives the time, and whether clocks go forward or back. Where the time never changes, there is no line.

It keeps your watches, with their accuracy checks, your wear history and your photographs the same on your iPhone, iPad and Mac, through your own private iCloud. It is off until you turn it on in Settings, under "Sync across devices". The records are kept under Apple's terms and are never sent to us.

In Settings, "Sync across devices", tap "Turn on" on each device, signed in to iCloud with the same Apple Account. The app first saves a copy of the records on that device, under "Earlier versions". Syncing starts the next time the app opens: on iPhone and iPad, close the app in the app switcher and open it again; on a Mac, quit it with Command-Q and open it again.

The app shows how many watches each holds and changes nothing until you choose. "Combine both" keeps every watch from each, and a watch added on both may show twice; the other choice replaces the records on that device with those in iCloud. In either case, a copy of the records on the device is saved first, and a watch that shows twice can be joined with "Merge into another watch".

The device is not signed in to iCloud, or iCloud is off for Watch Vault Tracker in the device's settings, and nothing was changed. "iCloud could not be reached" means the app could not reach iCloud, and nothing was changed. Turning on syncing requires an internet connection. Once syncing is on, the app works without a connection, and the devices are brought up to date when they connect again.

Settings are kept on each device: the display choices, the daily reminder, the second time zone and the folder for backups. Earlier versions are also kept on each device, and are not synced. The measurement of the microphone's clock, used by the check by sound, is also kept on each device.

No. While syncing is on, a backup or an earlier version cannot be restored, and the app says so. Restoring is possible again once syncing is turned off and the app has been opened again.

"Turn off syncing" asks first, and syncing stops the next time the app opens. The device keeps its records, and iCloud keeps its copy; neither is deleted.

No. Syncing keeps the same records on every device, so a watch deleted on one device is also deleted on the others. Backups to a folder and earlier versions are separate copies, and the app keeps making them while syncing is on.

Three kinds of copy can hold your records:

• Earlier versions, kept on the device by the app, with nothing to set up.
• Backups to a folder you choose, such as one in iCloud Drive, made by the app once a folder is chosen.
• Apple's backup of an iPhone or iPad, which includes the app's records, under Apple's terms.

In Settings, "Backups", tap "Choose a folder"; the app also asks once, when there is first a collection to back up. A backup of your watches, with their accuracy checks, your wear history and your photographs is then saved once a week when you open the app, or every day, as set in "How often". The backups go in a folder of their own, "Watch Vault Tracker Backups", where the newest four are kept, and "Back up now" makes one immediately.

A backup is made only when the app is opened and a backup is due, because iOS does not run the app on a fixed schedule. When a backup cannot be saved, Settings says "The last backup could not be saved", and the backup is tried again the next time the app is opened.

Only when you lock them. In Settings, under Backups, "Lock backups with a password" locks every backup made on that device, and a file for Watch Vault Archive can be locked with a password when it is exported. A spreadsheet is never locked. Anyone with a copy of a file that is not locked can read its contents, and the app says which applies where each is made. A locked backup cannot be opened without its password, by anyone, including us. On a new device the backup password has to be set again; until it is, no backup is made. Where a file goes after it is shared, and which folder holds the backups, is your choice.

Earlier versions are copies of the records, with their photographs, kept on the device: every week when the app is opened, if anything changed, and before an update, an import, a restore or turning on syncing. The last two of each kind are kept, and Settings lists them in "Backups", under "Earlier versions". They stay on the device, so they do not help if the device is lost or damaged; the backups to a folder are for that.

In "Earlier versions", tap "Restore" beside the version, then "Restore this version". The app saves the current records first, and restores the earlier version the next time it opens; until then, nothing new can be recorded. "Keep the current records" cancels it before then.

"Restore a backup" is in Settings, under "Backups" and "Transfer between devices", and on the first screen of a device with no watches. The app shows what the backup holds before anything changes. The backup replaces the records on the device rather than adding to them, so nothing is merged or doubled, and the records that were there are saved first, under "Earlier versions".

When Sync across devices is on for both devices, the records come through iCloud. Without it, "Share a backup" in "Transfer between devices" makes a backup file to send by AirDrop, Mail or Messages, or to save in Files, and "Restore a backup" on the new device reads it. A backup in a folder in iCloud Drive is restored in the same way, and a device set up from Apple's backup of the old one already has the records.

Nothing has been changed or deleted: the records are still on the device, and an update to the app can open them. In the meantime, "Save a copy of the records" saves the files to Files or sends them to yourself. "Contact Aveneg Technologies" opens our Contact page, and the line that starts with "Detail for Aveneg Technologies" can be copied into the email.

Deleting the app removes the records kept on that device, with its earlier versions. Copies kept elsewhere stay: the records in iCloud if Sync across devices was on, backups in a folder in iCloud Drive, and Apple's backup of the device, until the next backup is made without the app. We hold no copy, so we cannot recover records that were only on the device.

Watch Vault Archive is desktop software from Aveneg Technologies, LLC, for detailed records of a watch collection: purchases, service history, insurance and documents. It is for Mac and Windows, coming Early 2027. Settings, under Watch Vault Archive, has a link to watchvaultarchive.com. The watches you list there can be brought into this app, so you do not type them in again.

They share watches by files that you move. In Settings, under Watch Vault Archive, the export makes a file of all your watches, with a photograph of each watch first added here, for Watch Vault Archive to import. The import reads an unencrypted export from Watch Vault Archive, and adds or updates watches, with one photograph each. Wear history is not sent or received in either direction.

It reads the maker, model, reference, category, status and one photograph of each watch, and nothing else in the file; a watch the Archive lists as Seeking is not imported. "Review import" shows each watch as new or already here before anything is saved, and "Owned watches only" leaves out the watches that have left. Watches already here keep their nickname and their wearing records, and a copy of the records is saved first, under "Earlier versions".

The app reads CSV files, which Numbers, Microsoft Excel and Google Sheets can save; "Import a spreadsheet" is in Settings, under "Spreadsheet". Maker and Model are needed, Reference, Nickname, Category and Status are read when present, and other columns, such as a price or a serial number, are not read. The import adds watches and updates details from the cells that are filled in; a blank cell leaves a detail as it is, and no watch is removed. The changes are shown before anything is saved, and a copy of the records is saved first, under "Earlier versions". "Get the template" gives the columns and an example row.

Yes. "Export a spreadsheet" makes a CSV file of your watches, in the same columns, for Numbers or Excel. It holds watch details only, without wear history or photographs, and it can be edited and imported again.

No. A spreadsheet brings in watches only, and Watch Vault Archive sends no wear history. Wearing records come in only from a backup made by Watch Vault Tracker, or through Sync across devices, and of the files the app makes, only a backup holds them.

No. The app has no account, no server of ours, no analytics and no advertising, and your records are never sent to us. They are kept on your device, and in your own private iCloud if Sync across devices is on. The privacy policy is in Settings, under "Privacy policy", and at watchvaulttracker.com/privacy; questions about it go to privacy@watchvaulttracker.com.

The app connects only to the App Store, to check whether the licence is owned, to show its price and to buy or restore it, and to your own iCloud, for Sync across devices: when "Turn on" is tapped, and while syncing is on. Links in the app, such as the one to watchvaultarchive.com, open in your browser. The rest of the app works without a connection.

The app asks for the camera the first time "Take Photo" is used, and uses it only for that. "Choose from Photos" uses Apple's picker, so the app receives only the photograph you choose. Each photograph is saved again without its location or camera details, and a photograph taken in the app is not added to your library.

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Every feature is free for 30 days, counted from the first watch you add. After that, adding new watches needs a one-time licence, bought through Apple. Everything already in your collection stays open, with or without one: reading, recording wears, editing, deleting, accuracy checks, exports, backups and restore. The app has no subscription and no advertising.

They start when you accept the notice the app shows as you add your first watch, "Add watches free for 30 days". The day you accept is day 0, and adding stays free until midnight at the end of the 30th day after it, in the time zone of your device. Deleting watches does not restart the count. The date is kept with your records, so it reads the same on your iPhone, iPad and Mac, and Settings, under Licence, shows it.

Adding a new watch shows "Adding a watch needs a licence", with the price and a button to buy it. "Not now" leaves everything as it was. Nothing else changes, and every record stays open.

In Settings, under Licence. The licence belongs to your Apple Account, so it covers your iPhone, iPad and Mac. On a new device, or after reinstalling the app, tap "Restore purchase".

Refunds are handled by Apple, under Apple's terms, because the licence is a purchase made through Apple. Apple tells us how many licences were bought and in which country, never who bought one.