A HEATMAP DIFF VIEWER FOR CODE REVIEWS

Summary from the TLDR Dev newsletter

This tool provides a heatmap diff viewer for code reviews, highlighting lines and tokens based on their potential need for human attention, not just for bugs but also for complexity or unusual patterns. It uses GPT-5-Codex to analyze each diff and generate a JSON data structure, which is then used to create a color-coded heatmap overlayed on the code changes.