bringYourOwnBrain.org

bringYourOwnBrain.org provides a 1-line SDK (BYOB Web SDK) that developers can add to a web game or app by loading a script tag and mounting a connect button. When a player clicks 'Connect Local AI', an isolated sandbox loads the lightweight Qwen2.5 0.5B open model into the browser via WebGPU, falling back to CPU via Transformers.js (WASM) when WebGPU is unavailable. Inference streams into game logic, and the site states that prompts and outputs are not sent to its servers and that no API tokens are billed. The site also offers demos (including a physics-driven NPC game, Midgey's Midnight Mash, and a minimalist BYOB chat example), a 1-Shot Game Generator / prompt generator that produces prompts for use with external LLMs such as Claude, Gemini, or ChatGPT, and states that the SDK is Apache 2.0 licensed and that the platform has no accounts or email requirements for the prompt generator.

Key features

• 1-line SDK: add a single script tag and mount a connect button in any div or float it bottom-right
• Browser-based local inference using WebGPU, with automatic WASM CPU fallback via Transformers.js
• Initial release uses the Qwen2.5 0.5B open-weight model; the site says more models are being added
• Streaming token output for game logic, with a chat(...) API and onChunk callback
• Client-side inference with no server-side inference or telemetry pipelines, per the site's privacy statement
• Live demos, including a physics-driven interruptible NPC game and a vanilla JS chat room
• 1-Shot Game Generator / prompt generator that creates a mega-prompt for external LLMs to produce a single game.html file
• Works with pure JavaScript, React, Canvas, Phaser, or Matter.js according to the site
• Open-source SDK under Apache 2.0 License

Best suited for

• Web game developers adding AI-driven NPC dialogue without backend infrastructure
• Developers who want to avoid per-token AI API costs
• Hobbyists and hackathon participants creating browser-based AI games
• Users wanting to try local open-weight AI in a browser

Pricing

The site describes the platform and SDK as free, and the prompt generator as 100% Free. The SDK is Apache 2.0 licensed with no licensing fees owed to BYOB. No paid tiers are described.