AI Tool Interface — HTML/CSS Kit

Put a polished interface on your LLM product in an afternoon. This kit has 8 connected pages: a chat workspace with code blocks, copy buttons and a model picker; a playground with temperature, max tokens, top P, penalties, a system prompt and stop sequences; a searchable prompt library with categories; conversation history with filters; API keys with usage meters and rate limits; tabbed settings for profile, model defaults, billing, team invites and security; a sign-in page; and a 404. The chat actually works. Type a message and press Enter: it appears in the conversation, a typing indicator shows and a demo reply arrives. Replace one function, sendToModel(), with a call to your server and the chat is live. The kit is provider-agnostic, so it works with any model API or your own models. It is plain HTML with one CSS design system and vanilla JavaScript. No build step, no framework, nothing to install. The details are done: dark and light themes that remember the user's choice, an off-canvas mobile sidebar, keyboard-operable tabs and menus, live slider values, labelled fields and visible focus throughout. The client-work license covers your own products and interfaces you build for clients.