Mainplate

Mainplate is the only watch app that tracks your flips, manages your collection, and lets you shake your phone to decide what to wear today.
Built for collectors, flippers, and watchmakers who are done with spreadsheets.

DAILY PICKER — Let Fate Decide
Shake your iPhone. Mainplate picks a watch from your collection at random. It's the most fun you'll have with a tracker app.
Your daily pick also lives on your Home Screen — the widget updates automatically every time you roll.
ATOMIC CLOCK SYNC — Set It Right
Sync your wristwatch precisely to the atomic clock, directly from the app. No guessing, no drift.

DASHBOARD — The Full Picture
Total capital deployed. Realised profit. Average ROI. Open inventory value. Everything in one glance — no digging required.
iCLOUD SYNC — Everywhere You Are
Your collection, flips, and inventory sync automatically across iPhone and iPad via iCloud. Switch devices, pick up where you left off.
FLIP TRACKING — Know Your Real ROI
Every flip is a complete financial record. Log purchase price, add expenses, track labor hours at your hourly rate, and let Mainplate do the math. The moment a flip is marked Sold, you get net profit and ROI % — automatically.
A four-stage workflow (Acquired → In Progress → For Sale → Sold) keeps your pipeline and closed deals clearly separated, color-coded throughout.
YOUR COLLECTION — Every Watch, Every Detail
Document each piece with photos, purchase price, full service diary, and running cost breakdown. When you sell, gain or loss is calculated instantly.
A dedicated Wishlist tab keeps your grail watches ready to promote to your active collection at any time.
TIMEGRAPHER LOG — Precision at a Glance
Record readings across all six standard positions (DU, DD, 3U, 6U, 9U, 12U), amplitude, and beat error. Mainplate computes the delta automatically with color-coded diagnostic warnings referenced against COSC and METAS certification zones — before and after service.
INVENTORY & EQUIPMENT — Your Workshop, Counted
Parts, oils, gaskets, tools — tracked with quantity and value. Flip log entries auto-sync to inventory. Your equipment tracks its own total value separately.

MORE FEATURES
• Photo gallery with drag-to-reorder and lightbox viewer
• Inline editing directly in the list
• Light & dark mode
• Multiple currencies and custom category colors

Mainplate started as a free open-source web app, already used by the watch community. The iOS version brings the same tools natively to iPhone and iPad.
Built for people who take their watches seriously.

DISCLAIMER
Mainplate is an independent app not affiliated with, endorsed by, or associated with any watch brand, manufacturer, or marketplace. All trademarks are the property of their respective owners. User-uploaded photos remain under the user's own responsibility.
By downloading Mainplate, you agree to Apple's Standard EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://jacopocaggiano.com/mainplate-privacy-policy/