Free · iOS · Android

The movement
behind your
collection.

Every reference, every wear, every wind logged with intention. The lunar cycle calculated on your device. Always offline. Always private.

Download Now See Features
CHRONO VAULT
Lunar Age
—days
Illumination
—%
29.53
Lunar cycle · days
Free
For all collectors
100%
Offline-first
∞
Collection size
Core Features

Precision in
every
function.

Built the way a grand complication is finished — every layer visible, every decision deliberate.

01
The Vault

Every reference, complication, and receipt in one private place. Serial numbers encrypted at AES-256 and revealed only by Face ID.

02
The Journal

One tap to log. "Still wearing the Nautilus?" appears on launch. Switching watches, double-wears, and missing days handled automatically.

03
Wear Insights

Rotation mix, 30-day frequency, longest streak, dormancy alerts. Every metric computed locally from your journal.

04
Watch Care

Per-watch wind reminders on a 1–30 day cadence. An on-device lunar reference for setting your moon phase complication.

Tonight Waxing Gibbous 73% illumination Next Full MoonMay 8
The Collection

Three references.
Centuries of
tradition.

A small sample of what Chrono Vault keeps for you — references and complications, complete with their wear history and care reminders.

Start Your Vault
Patek Philippe Nautilus 5712
Ref. 5712/1A-001
Patek Philippe
Nautilus Moon Phase
Moon Phase Power Res. 40mm
****-****
A. Lange & Söhne Little Lange 1 Moon Phase
Ref. 181.086
A. Lange & Söhne
Little Lange 1 Moon Phase
Moon Phase Outsize Date 36.8mm
****-****
Hublot Spirit of Big Bang Sang Bleu
Ref. 648.CX.0114
Hublot
Spirit of Big Bang Sang Bleu
Skeleton Tourbillon 42mm
****-****
Built on Three Principles

Less surface,
more substance.

◯
Offline-first

Your collection lives on your device. Chrono Vault works at 40,000 feet, in basements, on flights — wherever you are.

⬡
Frictionless

Logging takes one tap. State-aware switching handles the math. The app gets out of your way so you can wear the watch.

◈
Private by default

Serials encrypted at AES-256-GCM. Biometric reveal. No analytics. No tracking. No third-party sharing.

Available Now

Free for every
collector.

Chrono Vault is free on iOS and Android. No subscription, no waitlist, no upsells. Download and start logging tonight.

Download on the App Store
Get it on Google Play