Reachat
💬 UI Building Blocks for LLM/Chat UIs. Maintained by @goodcodeus.
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What is Reachat?
Reachat is an open-source ReactJS component library designed to accelerate the development of LLM-powered chat UIs, reducing build times from weeks to hours. It provides highly customizable UI building blocks for creating chat interfaces, customer support bots, in-app assistants, and enterprise-grade conversational AI applications. The library handles the complexities of message rendering, user interactions, and layout management, allowing developers to focus on their unique application logic.
Key features include TailwindCSS-based theming for complete UI customization, rich media support with markdown rendering, file uploads, image/video embeds, code highlighting, math rendering, and YouTube embeds. Reachat offers console and companion modes, conversation pagination, smart session grouping, keyboard shortcuts, animations via Framer Motion, and responsive design. It leverages slots for extensibility, allowing developers to swap components without losing the library's functionality.
Reachat is ideal for React developers and teams building AI-powered chat interfaces who need flexibility without vendor lock-in. It is backend-agnostic and multi-provider support means it isn't coupled to any specific LLM or data model. The library is battle-tested in production environments across dozens of enterprise products and is released under the Apache-2.0 open-source license, making it free for both personal and commercial use.
Reachat pricing
Pricing model: Freemium
Free - Reachat is completely open-source under the Apache-2.0 license with no paid tiers. It is free to use for both personal and commercial projects with no login required. The library will remain open-source and free according to the maintainers. No subscription fees, no usage limits, and no premium features locked behind paywalls.
Reachat pros
- Open-source and completely free for personal and commercial use
- Dramatically accelerates chat UI development from weeks to hours
- Highly customizable with TailwindCSS theming
- Rich media support including file uploads, embeds, and markdown
- Multi-provider support without vendor lock-in
- Backend-agnostic - works with any LLM or data source
- Production-ready with battle-tested reliability in enterprise products
- Console and companion modes for different UI needs
- Smart session grouping and conversation pagination
- Keyboard shortcuts for improved user experience
- Code highlighting with GFM styling and math support
- YouTube embeds and custom remark/rhype plugin support
- Image preview and message sources support
- Responsive design with Framer Motion animations
- Intuitive API with slot-based extensibility
- Includes Figma template for design consistency
- Easy installation via npm, pnpm, yarn, or bun
- Active community support and regular releases
Reachat cons
- Requires React knowledge - not suitable for non-React developers
- No built-in backend or LLM logic - requires manual integration
- Inherits React ecosystem complexity
- Steep learning curve for developers unfamiliar with React
- Potential performance issues in complex UIs without optimization
- Limited user reviews and community feedback available
- Requires separate TailwindCSS setup and configuration
- No full-stack AI solution out-of-the-box
- May be overkill for simple chat implementations
Frequently asked questions about Reachat
What is Reachat?
Reachat is an open-source ReactJS component library that provides UI building blocks for building LLM-powered chat interfaces and chat UIs. It accelerates development from weeks to hours by handling message rendering, user interactions, and layout management while remain highly customizable through TailwindCSS.
Is Reachat free to use?
Yes, Reachat is completely free and open-source under the Apache-2.0 license. It can be used for both personal and commercial projects with no subscription fees, usage limits, or premium tiers. The maintainers plan to keep it open-source and free indefinitely.
What programming languages and frameworks does Reachat support?
Reachat is built specifically for ReactJS and requires React knowledge to use. It works with npm, pnpm, yarn, and bun package managers. The library is built on top of TailwindCSS for styling and uses Framer Motion for animations.
Can I use Reachat with any LLM or AI provider?
Yes, Reachat is backend-agnostic and supports multi-provider usage. It isn't coupled to any specific LLM provider or data model, making it simply a set of building blocks that can connect to any AI backend, including OpenAI, Anthropic, Google, or self-hosted models.
What rich media features does Reachat support?
Reachat supports markdown rendering with GFM styling, code highlighting, tables, JSON display, lists, math rendering, YouTube embeds, file uploads, image preview, custom remark and rhype plugins, and message sources.
How do I install Reachat?
Install Reachat by running 'npm i reachat --save' or equivalent commands for pnpm, yarn, or bun. Then install TailwindCSS and reablocks, add Tailwind directives to your CSS file, wrap your app with ThemeProvider, and import the chat components you need.
What are the main components available in Reachat?
Reachat includes Chat, ChatInput, Conversation, NewSessionButton, Session, SessionGroups, SessionListItem, SessionMessage, SessionMessages, SessionMessagePanel, SessionMessagesHeader, SessionsGroup, and SessionsList components.
Can I customize the Reachat UI to match my brand?
Yes, Reachat is highly customizable using TailwindCSS. You can customize every aspect of the chat UI including colors, fonts, spacing, and layout. The library also uses slots to allow developers to swap out components while maintaining the library's functionality.
What production features does Reachat offer?
Reachat offers console and companion modes, conversation pagination, smart/dynamic session grouping, keyboard shortcuts, animations via Framer Motion, responsive design, and has been battle-tested in dozens of enterprise products in production environments.
Where can I find demos and examples for Reachat?
You can explore Storybook demos to see components in action, check the Getting Started documentation for installation guides, visit the example repo for a complete implementation, and clone the GitHub repository to run a development server locally at http://localhost:3000.