BuildPromptKit
AI prompts that ship real UI — every one has a live demo
What it does
Most prompt collections hand you text and a screenshot. BuildPromptKit hands you the running result: every prompt has a live demo rendered from the exact React component that prompt produces — click Demo and you see real output, not a mockup. 80+ live demos across Sites, Apps, Sections, Backgrounds and Components. Tested with Cursor, Claude Code, Lovable, Bolt, v0 and Replit. Free tier, or $29 once for everything plus future drops. No subscription.
Copy-paste ready AI prompts for stunning websites & apps. Built for Cursor, Claude Code, Lovable, Bolt, v0 and more.
Battle-tested AI prompts for landing pages, mobile apps, sections and components. Copy, paste into your AI builder, done. Scroll-tied cinematic section: a 500vh track scrubs an aerial clip frame by frame through a WebCodecs frame bank, with three sequential copy blocks. Full-bleed planet loop on a 1353x1163 unit grid: two edge-cropped cut-outs flank the button and swap which world is featured. Liquid-glass weather dashboard on a 1357x871 unit grid: frosted panels over a storm photo and a chart that draws itself, then fills. Single-screen AI app-builder landing: full-bleed dawn video, glass composer card and a pixel-specified absolute toolbar. Scroll-driven 3D product page — the model…from buildpromptkit.com
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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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Launched alongside, August 2026
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Hello HN! I found that picking out plausible but diverse skin tones for my digital art and game development projects was kind of difficult, and I got curious about if there was a way to define a color space that made it easy. I've built a color picker and procedural generation algorithm based on the space as well as a bunch of other fun js features and demos throughout the page that use the equations. If you find it interesting, I have lots of explanations of how I built it and what properties the space has. The methodology might be a bit shaky, but hopefully the result is as helpful for…
Life & fun · Aug 2026 · toneyalexander.github.io


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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