CrownSide

Mechanical Watch Companion

Only for iPhone

Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.

iPhone

For the watches you actually care about. Log daily wear, track accuracy drift, and keep every service record — private, on-device, yours. CrownSide is the watch journal built for enthusiasts who care about the details. Whether you own one cherished piece or a growing collection, CrownSide helps you track every wear, every service, and every tick — all in one place. Your Collection, Organized - Add each watch with a photo, brand, model, serial number, purchase date, and personal notes. Everything you need to know about a watch is always a tap away. Daily Wear Log - Record which watch you wore each day — swipe right on a watch to log it in one motion. Browse your wear history on an interactive calendar and see yearly summaries with per-watch streaks — a personal diary of time on the wrist. Accuracy Tracking - Measure your watch's timekeeping performance over time. Log offset readings, filter by winding position, visualize drift on a scrollable chart, and see seconds-per-day rate for each entry. Know exactly how your movement is performing. Maintenance History - Keep a complete service record for every watch. Log overhauls and repairs with dates and notes, so you always know when a watch last saw a watchmaker. Private by Default - No account. No subscription. Your data lives on your device. Export & Import - Back up your watches or move them between devices with a single JSON export. Your data is always yours.

Ratings & Reviews

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- Swipe to log — swipe right on any watch to record today's wear in one motion - Japanese language support - Today's wear hint — a floating badge on the watch list shows which watches you've worn today - Position filter — filter accuracy measurements by winding position (dial up, crown up, etc.) - s/day drift per measurement — each accuracy entry now shows the calculated seconds-per-day rate - Polished animations and smoother scrolling throughout - Various UI refinements and bug fixes

Version 1.2

The developer, Zhang Linghua, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Seller
    • Zhang Linghua
    Size
    • 1.3 MB
    Category
    • Lifestyle
    Compatibility
    Requires iOS 26.2 or later.
    • iPhone
      Requires iOS 26.2 or later.
    • Mac
      Requires macOS 26.2 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 26.2 or later.
    Languages
    • English and Japanese
    Age Rating
    4+
    In-App Purchases
    Yes
    • Short Latte $1.99
    • Venti Macchiato $9.99
    • Espresso $0.99
    • Tall Cappuccino $4.99
    • Learn More
    Copyright
    • © 2026 Reika
  • Privacy Policy