STEM Line Builder

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