thinkscript Open Interest Change Heatmap in Option Chain for Thinkorswim (FREE)

# OI Net Change Heatmap (Option Chain Column) v2.3

# Date: 2025-08-29

# Author: 0DTE_SPX | https://0dtespx.gumroad.com |https://x.com/0DTE_SPX

# Purpose: Spot changes in Open Interest from prior day to see if contracts have been added or removed. Heatmap gradients help show where interest is concentrated.

# NOTICE: Only updates during regular trading hours.