MindTree
An AI that thinks alongside you, not instead of you.
What it does
Most AI tools try to think for you. This one sits next to you. This is a thinking companion designed for people who want clarity without giving up control. You start with your own thoughts — clear or messy. The AI first reflects what you said, then gently suggests possible nodes. You decide what stays, what goes, and what gets renamed. Over time, it learns how you think, not what to think: your pacing, your decomposition style, your decision habits.The more you use it, the more natural it feels.
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I trained a 125M-parameter transformer to autocomplete piano performances in real time (~108 notes/sec on an iPhone 15). The idea is basically GitHub Copilot or Tabnine, except instead of prompting it with code, you prompt it by playing a few notes on a MIDI piano. The model then continues what you played, entirely on-device. The app is free if anyone wants to try it. Happy to answer questions about the model, training, Core ML, or the many things that didn't work.
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Hey HN, Henry from Cactus here! We previously released Cactus Needle, a 14MB agentic LLM for tool call, device use, and structured extraction for phones, wearables, smart homes, small robots and microcontrollers. We got really great feedback here, and have now incorporated the suggestions to release Needle 2. The whole model is a single 14MB binary that runs a full session in 28MB of RAM; 45m parameters at 2bit compression. Needle hits 500 tokens/sec decode speed on a Raspberry Pi 5, sits between 400-1,500 tokens/sec on VR devices like Meta Quest 3S and Apple Vision Pro, and ranges…
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