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Dev.to
7/25/2026
The original title is: "Building CODA: A Local-First AI Operating System Built Solo in 30 Days"

The original title is: "Building CODA: A Local-First AI Operating System Built Solo in 30 Days"

Original: I Built a Local-First AI Operating System With 296,000 Lines of Code. Alone.

Short summary

A solo developer built CODA, a local-first AI operating system with 296,000 lines of code over 30 days. It includes a 2.2B parameter transformer trained from scratch, a phone-video-to-3D-model pipeline, a local voice assistant, and multimodal generation capabilities. The project runs entirely on a laptop with an RTX 5070, using free-tier cloud GPUs for training.

  • •296K-line local-first AI OS built solo in 30 days with no cloud dependency
  • •Core 2.2B transformer trained from scratch using free-tier GPUs from Kaggle, Modal, and Colab
  • •Includes 3D reconstruction from phone video, local voice assistant, and multimodal generation

Generated with AI, which can make mistakes.

#ai-tools#open-source
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