STEM Line Builder: Longboard

Build dance lines from carving

Only for iPhone

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

iPhone

Your carving becomes a line you can see from above. Tap a curve on the path, drop in a step you already know, and your dancing line builds itself. STEM Line Builder helps you design "lines" (routines) for longboard dancing. Upload a carving video filmed head-on and the AI reads your posture to draw your board's trajectory as a top-down map. Then just tap a carve on the path and place a step you've learned -- only steps that fit the carves before and after are offered, so your line always flows. --- About subscriptions - Yearly plan: 4,000 JPY / year (auto-renewing) - Monthly plan: 500 JPY / month (auto-renewing) - Lifetime: 8,000 JPY (one-time purchase, does not renew) Subscriptions renew automatically unless canceled at least 24 hours before the end of the current period, and are billed to your Apple ID. You can cancel anytime in your App Store account settings. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://ryoogasawara981.github.io/stem-line-designer/privacy.html

Ratings & Reviews

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- Three new steps added: Fakie BS 180 Step, Fakie Cross Step, and Short Peter Pan, each with a demo video. - Saved lines in My Line can now be reordered by long-pressing and dragging. - Fixed a bug where Fakie steps were offered while riding in normal stance.

Version 1.1.6

The developer, Ryo Ogasawara, 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
    • Ryo Ogasawara
    Size
    • 102.4 MB
    Category
    • Sports
    Compatibility
    Requires iOS 15.0 or later.
    • iPhone
      Requires iOS 15.0 or later.
    • iPod touch
      Requires iOS 15.0 or later.
    • Mac
      Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    • English
    Age Rating
    4+
    In-App Purchases
    Yes
    • STEM Pro Monthly $2.99
    • STEM Pro Yearly $24.99
    • STEM Pro Lifetime $49.99
    • Learn More
    Copyright
    • © 2026 Ryo Ogasawara
  • Privacy Policy