True Ring Size: Sizer & Gauge

Measure Finger on Screen

Only for iPhone

Free · Designed for iPhone. Not verified for macOS.

iPhone

Measure your ring size at home — offline, free, no ads. Place a ring or your finger on the screen and convert US/UK/EU/JP sizes instantly. Find your ring size in seconds — no physical sizer needed. True Ring Size turns your phone into an accurate ring sizer that works fully offline. Two ways to measure: • Ring on screen — place a ring you already own on the display and resize the circle until it matches. • Finger on screen — line up the guides to your finger and read the size instantly. Calibrate once with any bank card for real-millimeter accuracy, then convert between US, UK, EU, Japan, China and Russia sizing — by diameter or circumference, in mm or inches. Why True Ring Size: • 100% offline — no internet permission, nothing leaves your phone • Free forever — no subscription, no in-app purchases • No ads, ever • No account, no tracking, no data collection • Save sizes for the whole family — perfect for surprise gifts and engagement rings • Full conversion chart for every country system Whether you are buying an engagement ring, a wedding band, or a gift, True Ring Size helps you order the right size online with confidence. Note: on-screen measuring depends on your screen; calibrate with a card and measure twice for best results.

Ratings & Reviews

  • 1.0
    out of 5
    1 Ratings

The developer, lapnito.cz s.r.o., 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
    lapnito.cz s.r.o.
    Size
    32.2 MB
    Category
    Utilities
    Compatibility
    Requires iOS 13.0 or later.
    • iPhone
      Requires iOS 13.0 or later.
    • iPod touch
      Requires iOS 13.0 or later.
    • Mac
      Requires macOS 11.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    English
    Age Rating
    4+
    Copyright
    © 2026 Lapnito
  • Privacy Policy

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