# Language Model Builder

7 Hacker News commenters recommended Language Model Builder and 1 criticized it, November 2025 to November 2026. It was recommended in 2 of 13 months.

**Verdict:** Free hands-on app that teaches building a language model from scratch in hours to days. Critics note a crash in chapter 1's 'under the hood' link.

## Why people recommend it

- Praised as excellent and cool (4 comments): "Man, this is excellent! thank you so much for sharing this for free" ([source](https://news.ycombinator.com/item?id=49432199)) "This is the coolest link I saw on HN the last 2 months." ([source](https://news.ycombinator.com/item?id=49417305)) "Beautiful work! What prompted you to build this?" ([source](https://news.ycombinator.com/item?id=49420963))

## What people warn about

- Chapter 1 'under the hood' link crashes (1 comments): "in chapter 1, the "under the hood" link crashes the app" ([source](https://news.ycombinator.com/item?id=48998456))

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## Cite as

Hacker Approved, "Language Model Builder", https://hackerapproved.com/p/language-model-builder/ (counts from 1,795,640 Hacker News comments, November 2025 to November 2026).