Open Source ChatGPT Alternatives

Open WebUI is a self-hosted platform for running AI on your own infrastructure. It connects to local models via Ollama, cloud providers like OpenAI and Anthropic, or anything with a compatible API. Your data stays wherever you put it.

The platform supports voice, vision, retrieval-augmented generation, web search, and text generation out of the box. You can extend it with Python functions, so adding custom tools or integrations doesn't require forking the project or waiting on a roadmap. That's a meaningful difference from hosted options like Eden AI or Humanloop, where extensibility stops at the API boundary.

For teams and organizations, Open WebUI includes SSO, role-based access control, and audit logs. These features make it viable in regulated industries where most hosted AI tools aren't an option. One deployment can serve everyone from individual developers to large enterprise teams.

The community is substantial. Over 408,000 members share prompts, models, tools, and functions through openwebui.com. You can browse and install what others have built, or contribute your own. With 290 million downloads and 138,000+ GitHub stars, the project has real traction.

You own the deployment. No vendor account, no data leaving your environment unless you choose a cloud model, no subscription gating features. If you're already running tools like OpenHands or Pipeshub on your own infrastructure, Open WebUI fits the same pattern. The same platform runs on a laptop or scales to a full enterprise setup.

LobeHub is a platform for building and operating teams of AI agents. Rather than managing individual AI tools one at a time, it lets you assemble agents into coordinated groups, assign them tasks, and let them run. Agents report back on progress while you focus on higher-level decisions.

The agent builder starts from a single sentence. From that, LobeHub automatically configures names, roles, skills, and behaviors. Agents connect to a library of over 312,000 skills, and you can attach any model or modality you want. It works with providers like OpenAI and Anthropic, so you're not locked into one AI backend.

For longer or more complex work, LobeHub supports agent groups that self-assemble based on the task at hand. Multiple agents can work in parallel, iterate on each other's output, and handle multi-step jobs. This matters most for things like large-scale issue triage, content workflows, or anything that would otherwise require constant human coordination. Among AI agent platforms, that kind of parallel execution is still relatively rare.

The platform includes several workspace-style features: Pages for writing and refining documents with multiple agents sharing context, Projects for organizing work, Schedules for time-based task automation, and a shared Workspace with visibility controls for teams. There's also an IM Gateway that connects agents to messaging platforms where your team already communicates.

Agents are designed to improve over time. Personal Memory builds a structured, editable model of how you work. Continual Learning adjusts agent behavior based on patterns it observes. Memory is white-box, meaning you can inspect and edit what the system knows about you rather than treating it as a black box. That's a meaningful difference from tools like Khoj, where memory handling is less transparent.

LobeHub is open source and has a community component where agents and skills can be shared. It's built for individuals and teams who want AI to handle ongoing, multi-step work rather than single-turn interactions. If you're already using a knowledge management platform like Pipeshub or a multi-agent framework like Agno, LobeHub sits closer to the operational end of that spectrum, focused on running work rather than just organizing it.

AnythingLLM is a desktop application and self-hostable platform that lets you chat with your documents, run AI agents, and work with large language models entirely on your own machine. No account required. No data leaves your device unless you explicitly connect to a cloud provider. It runs on macOS, Windows, and Linux.

The core use case is document chat. You load in PDFs, Word files, CSVs, codebases, or content pulled from online sources, then ask questions against that material. The underlying LLM can be a local model running on your own hardware or a cloud provider like OpenAI, Azure, or AWS. You pick which one, and you can switch between them. It also supports multi-modal models, so working with images or audio is possible within the same interface.

Privacy is a first-class concern. By default, everything stays local: the model, the vector database, the embedder, your documents, and your chat history. Nothing is shared unless you configure an external provider. That makes it a practical choice for anyone handling sensitive business documents who can't send data to third-party APIs — including use cases that would otherwise call for legal AI platforms.

For teams, there's a self-hosted or cloud-hosted option with multi-user support. Each user gets isolated access, and admins get fine-grained controls over what users can see and do. The platform can also be white-labeled with custom branding, which makes it usable as an internal tool under a company's own identity.

Beyond document chat, it includes a built-in developer API for integrating its capabilities into existing products. If you're building on top of it, the API fits naturally into the broader LLM application framework ecosystem. A community hub provides shared agent skills, system prompts, and slash commands, so you can extend what the assistant can do without building from scratch.

The MIT license means the source is open and free to use or modify. If you want a lighter-weight alternative focused purely on chat, tools like LLMChat or LobeChat cover that narrower scope. AnythingLLM sits closer to a full local AI workspace, with document ingestion, agent support, and multi-user access all in one place.

Cherry Studio is a comprehensive AI assistant that brings together multiple AI models in one unified platform. Supporting iOS, macOS, and Windows, it allows you to seamlessly switch between different LLM providers without the complexity of managing multiple accounts or interfaces.

Key advantages include:

• Privacy-first approach - All data stored locally with no third-party uploads
• Multi-provider integration - Compatible with OpenAI, Anthropic, and other major AI services
• Personalized knowledge base - Import documents and web pages to create custom AI assistants
• Built-in assistant library - Thousands of pre-configured assistants for various tasks
• Advanced capabilities - Document analysis, image conversations, translation, and drawing models
• Cross-platform sync - Local and cloud backup options for seamless device switching

The platform eliminates the need for complex configurations - simply add your API keys and start using immediately. Whether you're working with text generation, image creation, translation, or document analysis, Cherry Studio provides a single interface for all your AI needs while maintaining complete control over your data privacy.

Jan is a revolutionary open-source AI assistant that brings the power of large language models to your local machine. By running entirely on your device, Jan ensures complete privacy and control over your data while delivering exceptional performance.

Key benefits of Jan include:

• Privacy-First: All interactions stay on your device, protecting your sensitive information.
• Customizable: Tailor Jan to your specific needs with a wide range of models and plugins.
• Offline Capability: Work seamlessly without an internet connection, perfect for travel or secure environments.
• Resource-Efficient: Optimized to run smoothly on consumer hardware, no cloud resources required.
• Open-Source: Benefit from community-driven improvements and transparency in development.
• Multi-Modal: Interact with text, images, and more, expanding your AI assistant's capabilities.
• Extensible: Easily integrate Jan with your existing tools and workflows for enhanced productivity.

Whether you're a developer, researcher, or professional in any field, Jan adapts to your unique requirements. Experience the future of AI assistance with uncompromising privacy and flexibility, all while keeping your data under your control.

LibreChat is the ultimate open-source app for all your AI conversations, fully customizable and compatible with any AI provider — all in one sleek interface. It offers a wide range of features and capabilities, making it a versatile tool for developers, researchers, and anyone interested in exploring the world of AI.

Key Features:

• Multiple AI Models: Supports various AI models, including Anthropic, AWS, OpenAI, Azure, and more.
• Agents: Advanced agents with file handling, code interpretation, and API actions.
• Code Interpreter: Execute code in multiple languages securely via API with zero setup - Python, JavaScript, TypeScript, Go, and more.
• Artifacts: Create React, HTML code, and Mermaid diagrams in chat.
• Multimodal: Analyze images and chat with files using various endpoints.
• Fork: Split messages to create multiple conversation threads for better context control.
• Search: Search for messages, files, and code snippets in an instant.

With over 20,000+ GitHub stars and 2,810,000+ Docker pulls since its launch on January 10, 2023, LibreChat has quickly become a popular choice among developers and AI enthusiasts.

Khoj AI is revolutionizing the way we interact with information and manage our digital lives. This powerful, open-source personal AI application serves as your second brain, offering a range of features designed to enhance your productivity and decision-making processes.

Key features:

• Can understand PDFs, images, plaintext notes
• Connected to the internet. Get fresh information and scrape web pages.
• Create automations to get notified about world events, create custom newsletters
• Custom Agents with personas, custom knowledge bases and tool
• Support for speech to text, text to speech, vision
• Access to latest, state of the art models (Llama, Claude, GPT)

If you self-host Khoj, you get support for:

• 100% offline embeddings and inference if desired (i.e., no internet required). You can use any LLM of choice off of Huggingface.
• 100% offline speech to text
• Support web-scraping with the public URL's you provide, even if you're self-hosted
• Can customize your models with any OpenAI API-compatible server, including Ollama.

Khoj AI stands out with its commitment to transparency, allowing users to trace the AI's reasoning and minimize hallucinations. The platform's ability to generate custom newsletters, provide timely research, and offer event-based notifications makes it an invaluable tool for professionals and researchers alike.

Leon is your open-source personal assistant designed to live on your server and automate your digital life. Built on Node.js, Python, and AI concepts, Leon offers a privacy-focused alternative to commercial virtual assistants.

Key features of Leon include:

• Privacy-first: Leon runs on your own server, giving you full control over your data and interactions.
• Modular architecture: Easily extend Leon's capabilities with custom packages and modules to fit your specific needs.
• AI-powered: Leveraging natural language processing (NLP), text-to-speech (TTS), and speech-to-text (STT) technologies for intuitive interactions.
• Multi-platform support: Interact with Leon through various interfaces, including web, mobile, and command-line.
• Customizable voice: Choose from multiple TTS and STT options, including offline solutions for enhanced privacy.
• Open-source community: Benefit from continuous improvements and contributions from a passionate developer community.

Leon empowers you to automate your virtual life by handling tasks, managing information, and providing assistance across various domains. Whether you need help with scheduling, information retrieval, or custom automation workflows, Leon can be tailored to your specific requirements.

Getting started with Leon is easy:

1. Install Leon on your server using the provided CLI tool.
2. Customize Leon's modules and skills to suit your needs.
3. Interact with Leon through your preferred interface.
4. Enjoy a personalized, privacy-respecting virtual assistant experience.

Join the Leon community today and take control of your digital life with an open-source assistant that puts you in charge.

Morphic revolutionizes the way users interact with AI systems by dynamically generating user interfaces as part of its response mechanism. This open-source answer engine goes beyond traditional chatbot interactions by creating contextual UI elements that enhance the user experience.

Key capabilities:

• Generates custom UI components on-the-fly based on user queries
• Provides AI-powered responses with interactive elements
• Handles diverse query types from quick searches to complex analysis
• Creates visual summaries and interactive displays
• Supports both conversational and structured data interactions

The system excels at adapting its interface to match user needs, whether it's displaying comparative analyses, generating charts, or presenting document summaries. Its open-source nature allows for community contributions and customizations, making it a versatile tool for developers and end-users alike.

5ire brings sophisticated AI capabilities to your desktop with a clean, intuitive interface that makes advanced AI features accessible to everyone. The application stands out with its support for multiple leading AI providers including OpenAI, Anthropic, Google, and Mistral.

A key differentiator is the integration of the Model Context Protocol (MCP), which acts like a universal connector for AI applications. This allows 5ire to leverage various tools for file system access, database interactions, and remote data retrieval, expanding far beyond simple chat capabilities.

The built-in local knowledge base powered by bge-m3 embedding model enables multilingual document processing and vectorization. Users can analyze docx, pdf, xlsx, and other document formats for powerful local Retrieval-Augmented Generation. Additional features include:

• Usage analytics to track API spending and optimize costs
• Custom prompt library with variable support for reusable templates
• Conversation bookmarks that persist even after message deletion
• Full-text search across all conversations
• Free and open source with cross-platform support

5ire combines enterprise-grade AI capabilities with user-friendly design, making it an ideal choice for both casual users and professionals seeking a powerful desktop AI assistant.

fullmoon is a revolutionary mobile app that brings the power of large language models to your pocket.

Here's what makes it stand out:

• Private and Local: Chat with AI models that run entirely on your device, ensuring your conversations remain private and secure.
• Offline Capability: Enjoy uninterrupted AI assistance even without an internet connection, perfect for travel or areas with poor connectivity.
• Optimized for Apple Silicon: Leveraging the power of Apple's custom chips, fullmoon delivers fast and efficient performance on iOS, iPadOS, macOS, and visionOS devices.
• Customizable Experience: Personalize your interaction by adjusting themes, fonts, and system prompts to suit your preferences.
• Integration with Apple Ecosystem: Use Shortcuts to incorporate AI-powered text generation into your workflows seamlessly.
• Open Source and Free: fullmoon is completely free to use and open source, allowing for transparency and community contributions.
• Multiple Model Support: Choose from different language models, including Llama-3.2-1B-Instruct and Llama-3.2-3B-Instruct, optimized for mobile devices.

Whether you're a writer seeking inspiration, a student looking for study assistance, or a professional needing quick information, fullmoon puts the power of AI in your hands, all while prioritizing your privacy and device performance.

Zola brings a fresh approach to AI chat interactions with its multi-model support and intuitive interface. This open-source application serves as your versatile AI companion, allowing you to seamlessly switch between different AI models for varied conversation styles and capabilities.

The app features a clean, user-friendly design with dedicated sections for different thinking modes - from quick summaries to deep research and creative inspiration. Smart suggestions help guide your interactions, while the agent system enables more focused and specialized conversations.

Key features include:

• Multiple AI model integration
• Specialized conversation modes
• Built-in suggestion system
• Clean and intuitive interface
• Research and learning assistance
• Creative inspiration tools

As a free and open-source solution, Zola offers a transparent and customizable platform for engaging with AI technology, making advanced AI interactions accessible to everyone.

llmchat.co is a powerful open-source research platform that puts privacy and user control first. Your chat history stays local, ensuring complete data privacy. The platform stands out with its comprehensive research capabilities, including Web Search, Pro Search, and Deep Research features that help you dive deeper into any topic.

The platform supports all major AI model providers and lets you bring your own API key (BYOK) for unlimited access. Notable features include:

• Privacy-first architecture with local data storage
• Extensive research tools for thorough investigation
• Full compatibility with mainstream AI models
• Open-source codebase for transparency and customization
• Upcoming MCP compatibility for expanded tool integration
• Built-in usage tracking for cost monitoring

Perfect for researchers, developers, and professionals who need powerful AI assistance while maintaining control over their data and workflows. Mobile version coming soon to extend accessibility.

VTChat is a production-ready, privacy-focused AI chat application delivering cutting-edge AI capabilities through a sophisticated dual-tier subscription system. Built with modern web technologies and a privacy-first architecture, VTChat offers advanced AI reasoning, document processing, web search integration, and comprehensive multi-AI provider support.

✨ Key Features:

• Premium AI Models (VT+ exclusive): Claude 4 Sonnet/Opus, GPT-4.1, O3/O3 Mini/O4 Mini, O1 Mini/Preview, Gemini 2.5 Pro, DeepSeek R1, Grok 3
• 9 Free AI Models: Gemini 2.0/2.5 Flash series + OpenRouter models (DeepSeek V3, Qwen3 14B)
• Multi-AI Provider Support: OpenAI, Anthropic, Google, Fireworks, Together AI, and xAI integration
• Document Processing (Free): Upload and analyze PDF, DOC, DOCX, TXT, MD files (up to 10MB) - available to all logged-in users
• Structured Output Extraction (Free): AI-powered JSON data extraction from documents - available to all logged-in users
• Thinking Mode (Free): Complete AI SDK reasoning tokens support with transparent thinking process - available to all logged-in users
• Mathematical Calculator (Free): Advanced functions including trigonometry, logarithms, and arithmetic - available to all users

🔒 Privacy-First Architecture:

• Local-First Storage: All chat data stored in browser's IndexedDB via Dexie.js
• Zero Server Storage: Conversations never leave the user's device
• Multi-User Isolation: Complete data separation on shared devices
• Enterprise-Grade Security: Secure authentication with Better Auth
• Privacy-Focused Security: Bot detection and secure authentication with Better Auth