Every watch in one place
Reference and serial numbers, style, year, what it cost and up to twenty photos, plus room to write down why the watch matters to you.
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Zen Horology
Your watch collection, organized and fully on your device.
- iPhone
- iPad
Why people pick it
A considered home for the watches you care about, without turning collecting into a spreadsheet chore.
ScreensZen Horology on
Zen Horology on
iPhone and iPad
What you getPurpose built
Purpose built
for one job.
Zen Horology is designed for a single task and finished properly. Here is what that means in practice.
A timegrapher in your pocket
Rest the watch against your iPhone and listen to it tick. The app reads rate, beat error and amplitude from the sound, picks up the beat rate on its own, and tells you in plain words whether anything needs a service.
Timing in every position
Measure dial up, dial down, crown down and crown left, and see the spread across them. A well poised movement holds close to the same rate whichever way it rests, and this is how you find out.
Check it for magnetism
A magnetised watch suddenly runs very fast. Hold it over your iPhone and the magnetometer reads the field in microtesla, so you know whether it needs demagnetising before you pay for anything else.
Set it to the second
A reference dial that reads down to a tenth of a second, with optional ticks and haptics that build as the minute closes so you can set the crown without watching the screen.
Service history and papers
Regulations, full services and repairs against each watch, alongside the warranty card, invoice and certificate, so the provenance stays with the piece.
Wear you can actually see
Every wear logged, with streaks, a monthly average and what each piece has cost you per wear. It settles the argument about which watch you actually reach for.
It tells you what the numbers mean
Each watch gets a written read rather than a wall of figures: what it has cost you per wear, how consistent it has been across every checkpoint you have logged, and whether its rate is inside chronometer standards.
Set it hands free
Give the reference clock a Siri phrase of your own, even just "Sync", and it opens with the screen held awake so the seconds stay visible while you set the crown.
Value and trends over time
Track what each piece is worth in the currency you think in, and how the collection moves, so you can see the shape of it rather than guessing from memory.
Works fully offline, syncs if you want
Nothing needs a connection. Log a watch, measure it, and read your history with no signal, because the catalog lives on your device. Turn on iCloud and the collection follows you to your iPad, and an export is always yours to take.
Two watches free, then unlimited
Keep two watches in the collection for free, with the timegrapher, the magnetism check and the reference clock all working on them. Zen Horology Premium lifts the limit. Apple shows the price and the billing before you buy.
In the boxEverything it does,
Everything it does,
in plain language.
- The record
- Specs, papers, photos and the story of each piece, together
- Timegrapher
- Rate, beat error and amplitude, measured through the iPhone microphone
- Positions
- Dial up, dial down, crown down and crown left, and how well it is poised
- Magnetism
- A microtesla reading, so you know before you book a service
- Reference clock
- A dial to a tenth of a second, with ticks and haptics as the minute closes
- Wear
- Every wear logged, with streaks, a monthly average and cost per wear
- Insights
- A written read on each watch, not just a chart of numbers
- Sharing
- A card per watch, in whichever of the designs suits it
- Sync
- Optional iCloud, so the collection follows you to your iPad
- Free tier
- Two watches, with every measuring tool working on them
Built for enthusiasts who want clarity, not clutter.
PermissionsWe ask in context,
We ask in context,
and no is a complete answer.
Most apps ask for everything at launch and explain nothing. We ask for a permission where the feature lives, tell you what it unlocks, and keep the app working if you decline.
Nothing to start
Open the app and use it. No account, no email, no verification step before you can do the thing you came to do.
Asked where it matters
A permission request appears next to the feature that needs it, in plain language, at the moment you reach for that feature.
Saying no keeps everything
Decline and the app still does its job in full. Allow it and that one feature does a little more, on your device.
QuestionsZen Horology,
Zen Horology,
answered plainly.
What do I get before I pay?
Two watches, and everything the app can do to them. The acoustic timegrapher, timing across positions, the magnetism check, the reference clock, wear logging and service history all work on those two. Zen Horology Premium is an annual subscription that lifts the limit on how many watches you can keep, and Apple shows the price and billing terms before you buy.
Is this only for luxury collectors?
No. It works for any watch enthusiast, from a small starter set to a large collection.
Can I track maintenance and servicing?
Yes. You can keep service dates, notes, and timing results tied to each watch profile, along with the warranty card, invoice and certificate.
Do I need a real timegrapher machine?
No. Zen Horology listens to the watch through your iPhone microphone and reads rate, beat error and amplitude from the ticking. Rest the watch with its crown against the top edge of the phone, somewhere quiet, and it collects a sample and reports what it heard. It will tell you when the signal is too weak or the room is too noisy rather than guessing.
Why would I check a watch for magnetism?
A magnetised hairspring is one of the most common reasons a mechanical watch suddenly starts gaining minutes a day, and it is usually cheap to fix. The app uses your iPhone magnetometer to read the field around the watch in microtesla and tells you whether it looks strongly magnetised, so you can have it demagnetised before assuming it needs a full service.
Will it help with insurance records?
It helps you keep organized records and details that are useful when documenting your collection.
Can I export my data?
Yes. Export options are included so you can keep backups and external records.
Available todayBuilt for one job.
Download on the App Store Built for one job.
Trusted with the rest.
Read the privacy policy and terms before you install. Stores show any price before you buy.