Show HN: Language Model Builder (an app to learn about and build models)

Category: ai-ml

Tags: llm, education, macos, mlx, training

Score: 6.3/10 (Innovation: 7, Technical: 7, Documentation: 6, Utility: 5)

Language Model Builder is a macOS app that provides an interactive textbook and training workbench for building and training small language models from scratch using Apple's MLX framework. It covers the full pipeline—tokenization, pre-training, fine-tuning (SFT/DPO), and chatting—with visualizations and a curated dataset catalog, making AI education hands-on and local. Its guided, no-coding-required approach fills a gap for non-experts curious about how LLMs work.

Target audience: AI learners, educators, and developers curious about language model training

Repository: https://languagemodelbuilder.com/

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