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Listing Lab Runs a Private Browser-Based AI Copywriter for Small Online Sellers

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Listing Lab is an open-source, MIT-licensed tool that generates product titles, descriptions, highlights, and search tags for independent Etsy, eBay, and Facebook Marketplace sellers. It is built with React, TypeScript, and Transformers.js and runs the open-weight SmolLM2-360M-Instruct model entirely in the browser. The model downloads once on first use, is cached afterward, and uses WebGPU when available with a CPU/WASM fallback, so seller data stays on the device. The developer positions it as a one-time-purchase alternative to subscriptions and metered API fees, though the first download is large and browser support varies. A public demo and repository are planned, and the developer intends to test with sellers before publishing.

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