Developer builds free browser-based room planner using OpenAI Codex and React

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A developer has created Small Room Planner, a free browser tool that lets users design furniture layouts in 2D and preview them in 3D without requiring a signup. Built with Astro, React, TypeScript, SVG, and Three.js, the tool stores all edits locally in IndexedDB unless the user chooses to share a snapshot. OpenAI Codex was used throughout development for implementation and debugging, with the workflow centered on small iterative cycles guided by an AGENTS.md constraints file. Key technical lessons included separating stored measurements from visual rendering, collapsing furniture-drag events into single undo steps, and loading the 3D preview only on demand. The project is still in early stages, with the developer currently focused on improving the first-time user experience after observing low engagement from initial visitors.

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