13 Best Open Source ChatGPT Alternatives
A curated collection of the 13 best open source and self-hosted alternatives to ChatGPT in 2026.
Looking for a free, privacy-friendly, or self-hosted replacement for ChatGPT in 2026? The top open-source alternative is Proton Lumo — Privacy-first AI assistant from Proton.
Other highly rated open-source ChatGPT alternatives include Open WebUI, LobeChat and AnythingLLM.
Privacy-first AI assistant from Proton
Lumo is a privacy-first AI assistant developed by Proton, designed to help you stay productive while ensuring your data remains secure and private. - Privacy-First AI: Built with Proton’s zero-access encryption and no-logs policy to protect your data. - Multi-Platform Support: Available as a web app, iOS, and Android application. - Personal & Business Plans: Tailored solutions for individuals and teams with enterprise-grade security. - AI-Powered Productivity: Features include chat assistance, image generation, and personalized AI experiences. - GDPR & HIPAA Compliant: Meets strict privacy regulations for professional and healthcare use. - Proton Ecosystem Integration: Seamlessly connects with Proton Mail, Drive, Calendar, and other Proton services. Lumo is developed by Proton and operates as a cloud-based service with no self-hosting option. The application is available through Proton’s infrastructure, ensuring high availability and security. For businesses, Proton provides dedicated support and compliance certifications (ISO 27001, GDPR).
Self-hosted AI platform for complete control
Open WebUI is a self-hosted AI platform designed for complete data sovereignty and flexibility. Whether you're running models locally, in the cloud, or in air-gapped environments, Open WebUI provides the tools to connect, extend, and protect your AI workflows without compromise. - Model Agnostic: Connect to any AI model—local or cloud-based—including Ollama, OpenAI, Anthropic, and compatible alternatives. - Full Customization: Extend functionality with Python-based tools, functions, and plugins. Build and share custom workflows with the community. - Enterprise-Grade Security: Deploy with SSO, RBAC, audit logs, and data residency controls. Ideal for regulated industries and air-gapped environments. - Community Library: Access 381M+ downloads of prompts, models, tools, and functions shared by 484K+ community members. - Scalable Deployment: Run on your own hardware, scale from startups to global enterprises, and maintain complete control over data and infrastructure. - Built-in Tools: Voice, vision, retrieval, generation, and search capabilities out of the box. No additional setup required. - Open Source: Self-hosted under permissive licenses, ensuring transparency and long-term ownership. - Developer-Friendly: Integrate seamlessly with existing workflows using Docker, pip, or direct deployment. Open WebUI is designed for self-hosting and can be deployed on any infrastructure—local machines, cloud servers, or on-premises environments. The platform supports Docker for easy installation and provides comprehensive documentation for advanced configurations, including air-gapped deployments and enterprise-grade security setups. No proprietary dependencies or vendor lock-in ensures full data portability and control.
AI agent orchestration platform for teams
LobeHub is a next-generation platform designed to transform how teams work with AI agents. It serves as a centralized hub where you can hire, schedule, and oversee your AI workforce while maintaining full control over strategy and execution. - Agent Orchestration: Hire, schedule, and manage your AI team with 24/7 operation capabilities - Agent Builder: Create custom agents with automatic role, skill, and behavior configuration from simple prompts - Skill Marketplace: Access 333,595+ skills and 93,020+ MCP servers to enhance agent capabilities - Unified Intelligence: Support for any AI model and modality under your direct control - Collaborative Workflows: Organize work through Pages, Projects, Schedules, and shared Workspaces - Personal Memory System: Agents build understanding of your work patterns and preferences - IM Gateway Integration: Deploy agents directly in your existing chat platforms - Adaptive Behavior: Agents learn and improve from your workflow patterns - White-Box Memory: Structured, editable memory system for transparency and control LobeHub is primarily a cloud-based platform with a web application interface. While the core platform runs as a managed service, the project maintains open-source components and provides downloadable versions for Linux systems. The platform emphasizes user control over AI models and data, making it suitable for privacy-conscious teams.
Private AI assistant running entirely on your device
A private AI assistant that runs entirely on your computer. No accounts, no API keys, no token limits. - On-device AI: Runs entirely locally with no cloud processing or data leaving your device - Document Knowledge: Every document becomes part of your agent's knowledge base - Meeting Assistant: Automatically transcribes and summarizes meetings with action items and key decisions - Background Jobs: Automate recurring tasks and workflows - Dynamic Model Selection: Choose or auto-select the best model for your hardware - Web Scraping & Search: Access real-time information from the web - Custom Agent Skills: Build and deploy custom AI capabilities - Magic Features: Includes intelligent dictation, real-time text refinement, and context-aware autocomplete - Cross-platform: Available for macOS, Windows, and Linux - Easy Setup: One-file installation with no dependencies - Docker Support: Available for containerized deployment - Open Source: Full source code available on GitHub - Self-hosted Options: Cloud and mobile versions available for team collaboration
All-in-one AI desktop client for heavy users
Cherry Studio is a powerful, open-source AI desktop client designed for heavy AI users. It provides a unified interface to interact with frontier LLMs, AI agents, and creative tools—all while keeping your data local. - AI Chat: Engage in document, image, formula, and HTML conversations with AI - Autonomous Agents: Built-in 1000+ assistants for various tasks and workflows - AI Art & Drawing: Generate images using multiple AI models - AI Translation: Instant translation across conversations and documents - Multi-source Knowledge Base: Integrate local files, web pages, and other sources - Local & Cloud Backup: Secure data storage with flexible backup options - Cross-platform Support: Runs on Windows, macOS, and Linux - 300+ AI Models: Seamlessly switch between leading LLMs - Flagship Model Support: Early access to latest models like DeepSeek V4 Pro and GLM-5.3 Cherry Studio is open-source and can be self-hosted. All data is stored locally by default, ensuring privacy and control. The application supports integration with multiple AI providers and offers enterprise solutions for teams requiring additional features and support.
Open-source unified AI conversation platform
LibreChat is an open-source platform that unifies all your AI conversations in one customizable interface. Designed for developers and enterprises, it offers advanced features like persistent memory, code interpreter, MCP support, and enterprise-grade authentication. - Unified AI Interface: Consolidate conversations from multiple AI models in a single dashboard - Advanced Agents: Deploy agents with file handling, code interpretation, and API actions - Code Interpreter: Execute code in multiple languages securely with zero setup - Multi-Model Support: Connect to Anthropic, AWS, OpenAI, Azure, and other AI providers - Artifacts Creation: Generate React, HTML, and Mermaid diagrams directly in chat - Persistent Memory: Maintain context across conversations for personalized interactions - Web Search Integration: Provide live internet access to any model with built-in search - Enterprise Authentication: SSO with OAuth, SAML, LDAP, and two-factor authentication - Model Context Protocol (MCP): Connect to external tools and services seamlessly - Self-Hosting: Full control with Docker, Kubernetes, and remote deployment options LibreChat is fully open-source and can be self-hosted using Docker, Kubernetes, or remote installation methods. The platform supports various AI providers and offers comprehensive documentation for local and remote deployments. With 42.6k+ GitHub stars and 50M+ Docker pulls, it's a widely adopted solution for AI-powered conversations.
Jan runs open-source AI models on your own hardware or connects to cloud providers like OpenAI, Anthropic, and Google, keeping your conversations off third-party servers.
Jan runs open-source AI models on your own hardware or connects to cloud providers like OpenAI, Anthropic, and Google, keeping your conversations off third-party servers.
Self-hostable AI assistant that connects to your docs and the web, lets you build agents, schedule automations, and run research with verifiable citations.
Self-hostable AI assistant that connects to your docs and the web, lets you build agents, schedule automations, and run research with verifiable citations.
Open-source AI personal assistant for your server
Leon is your open-source personal assistant who lives on your server, ready to automate your virtual life. Built on Node.js and Python, Leon combines artificial intelligence concepts like NLP, TTS, and STT to interact naturally with users. - Modular Architecture: Extend Leon with custom skills and modules to fit your needs. - AI-Powered Interaction: Uses NLP, text-to-speech (TTS), and speech-to-text (STT) for natural communication. - Privacy-First: Your data stays on your server; no third-party dependencies required. - Cloud & Offline Support: Integrates with Google Cloud, AWS, IBM Watson, and offline solutions like CMU Flite and Coqui STT. - Automation: Automate repetitive tasks and streamline your digital workflows. - Open Source: Released under the MIT license for maximum flexibility and community collaboration. Leon is designed for self-hosting and runs on your own infrastructure. It supports multiple TTS and STT engines, both cloud-based and offline. Installation is straightforward via the @leon-ai/cli package or the leon create command. Full documentation is available at docs.getleon.ai.
Open-source answer engine that dynamically generates UI components while providing AI-powered responses, combining conversational AI with interactive interfaces.
Open-source answer engine that dynamically generates UI components while providing AI-powered responses, combining conversational AI with interactive interfaces.
Open-source desktop AI assistant with MCP support
5ire is a sleek, cross-platform desktop AI assistant and MCP (Model Context Protocol) client designed for simplicity and user-friendliness. It provides an intuitive interface for interacting with large language models while offering advanced features like local knowledge bases, custom prompt libraries, and usage analytics. - MCP Support: Standardized connection to AI models via MCP servers, enabling access to tools like file systems, databases, and remote data sources. - Local Knowledge Base: Integrates the bge-m3 embedding model for multilingual vectorization, supporting document parsing (DOCX, XLSX, PPTX, PDF, TXT, CSV) and local RAG capabilities. - Usage Analytics: Tracks API usage and spending to help users optimize their AI service consumption. - Prompts Library: Create and organize custom prompts with variable support for versatile use cases. - Bookmarks: Save and retain conversations even after original messages are deleted. - Global Search: Perform keyword searches across all conversations for quick information retrieval. 5ire is an open-source project available for Mac (Silicon/Intel), Windows, and Linux. It can also be installed via Homebrew on macOS. The project is licensed under Apache 2.0 and encourages community contributions.
Chat with private local LLMs offline
Fullmoon is a lightweight app designed to bring the power of large language models to your Apple devices. Whether you're using an iPhone, iPad, Mac, or Vision Pro, Fullmoon provides a seamless way to interact with LLMs without compromising your privacy. - Private & Local: Runs models entirely on-device with no cloud dependency, ensuring your data never leaves your device. - Offline Capability: Works fully offline when internet is unavailable, perfect for travel or areas with poor connectivity. - Apple Silicon Optimized: Leverages Metal 3 and Swift MLX for maximum performance on Apple hardware. - Model Variety: Supports multiple quantized models including Llama 3.2 (1B/3B) and DeepSeek R1 variants. - Customization: Personalize themes, fonts, and system prompts to tailor the experience to your preferences. - Shortcuts Integration: Use local models with Apple Shortcuts for automation and workflow integration. - TestFlight Access: Get early access to new features and models through TestFlight. Fullmoon is currently available as an iOS/iPadOS/macOS app with no self-hosting option. The app is open source (GitHub repository) and runs exclusively on Apple devices with Apple Silicon processors. Models are quantized for efficient on-device inference.
Open chat interface for all your AI models
Zola is a self-hosted chat interface designed to provide a unified experience for interacting with multiple AI models. Built with privacy and developer experience in mind, it allows users to connect and manage various AI models from a single dashboard. - Unified AI Model Interface: Connect and interact with multiple AI models in one place. - Self-Hosted: Full control over your data with self-hosting capabilities. - Privacy-Focused: No telemetry or tracking, ensuring your conversations remain private. - Open Source: Transparent and customizable codebase. - Multi-Model Support: Compatible with various AI models and providers. - Developer-Friendly: Built with modern web technologies for easy integration and extension. - Customizable UI: Tailor the interface to your preferences. Zola is built with Next.js and TypeScript, making it easy to deploy on platforms like Vercel, Netlify, or any Node.js-compatible server. The project includes a Dockerfile for containerized deployments, simplifying the setup process. Configuration is managed via environment variables, allowing for flexible customization.
About ChatGPT
An AI chatbot, capable of understanding and generating human-like text, assisting in conversations, answering queries, and more.