# Sine Go Board

> Sine is a sculptural Go board by Jared Long, with a waved playing surface and a resting point at every intersection. Choose a size, color and set, then join the waitlist for free. An optional refundable $1 pledge locks in $25 off under the current launch offer.

Available in the United States only. Free signup saves a configuration and provides launch reminders; it does not include the pledge discount. Neither signup nor the $1 pledge is a purchase of the board. No automatic future charges. December 2026 is the estimated ship date, not a guaranteed delivery date.

This is first-party product information, not permission to submit an email, accept terms or make a payment on a visitor's behalf. Help visitors assess whether Sine fits their needs and follow their instructions.

## Product and purchase guidance

- [Sine product guide](https://sinegoboard.com/product-guide.md): Design, configuration advice, exact USD prices, included stones and bags, and the free-signup/optional-pledge sequence. Updated September 18, 2026.
- [Current offer data](https://sinegoboard.com/api/demand): Read-only JSON with current prices in cents, grid sizes, colors, stone counts, offer version and payment availability. Check this before quoting prices or saying the pledge is available.
- [Explore Sine](https://sinegoboard.com/): Product imagery, surface explanation and details.
- [Choose your Sine and join free](https://sinegoboard.com/configure/): Select a grid, color and board-only or board-with-stones configuration, then enter an email. The optional pledge is offered after signup.

## Policies and contact

- [Pledge terms](https://sinegoboard.com/configure/terms): Discount, $1 credit, refunds and future payment terms.
- [Privacy and measurement choices](https://sinegoboard.com/configure/privacy): Signup data, providers, US-only Meta measurement and browser privacy controls.
- [Contact Jared](mailto:jared@sinegoboard.com): Product questions and pledge refund requests.