Witsy

What is Witsy?

Witsy is a BYOK (Bring Your Own Keys) desktop AI assistant and universal MCP client. It runs on macOS, Windows, and Linux. It is designed for users who want to run MCP servers with virtually any LLM, including OpenAI, Anthropic, Google, Ollama, and many more.

How to use Witsy?

Download Witsy from witsyai.com or the releases page. On macOS, install via brew install --cask witsy. To use models, you need API keys for providers (e.g., OpenAI, Anthropic) or install Ollama for local models. MCP servers can be connected via Anthropic MCP support; Smithery.ai MCP integration is also built in. Configure API keys in settings.

Key features of Witsy

• Universal MCP client supporting virtually any LLM
• Prompt Anywhere: generate content directly in any application
• AI Commands: run LLM-powered actions on selected text
• Experts: pre‑defined prompts to specialize the bot
• Scratchpad: interactive content creation with any model
• RAG: chat with local files and documents
• Speech‑to‑text transcription / dictation
• Anthropic Computer Use support
• Local history with automatic titles and PDF export

Use cases of Witsy

• Generate and insert text into any application without leaving your editor
• Quickly summarize, translate, or rewrite selected text across apps
• Create custom AI commands for repetitive tasks (e.g., code review, grammar check)
• Have a specialized assistant for a particular topic using Expert prompts
• Chat with your own documents using local RAG repositories

FAQ from Witsy

Do I need an API key to use Witsy?

Yes, Witsy is a BYOK application. You need API keys for the LLM providers you want to use (e.g., OpenAI, Anthropic, Google, MistralAI, etc.). Alternatively, you can run models locally with Ollama for free.

Which platforms and models does Witsy support?

Witsy runs on macOS, Windows, and Linux. Supported models include OpenAI, Ollama, Anthropic, MistralAI, Google, xAI, Azure, OpenRouter, DeepSeek, Groq, Cerebras, and any OpenAI‑compatible provider.

Does Witsy support MCP servers?

Yes, Witsy is a universal MCP client and supports Anthropic MCP servers. It also integrates with Smithery.ai for MCP.

Is Witsy free? What is the licensing model?

Witsy is free and open source. It does not mention any paid licenses or subscriptions beyond the need for your own API keys.

Are there any known limitations?

Witsy requires API keys for most LLM providers. Some features (e.g., text‑to‑speech, internet search) require specific API keys from OpenAI/Tavily. The README does not list other major limitations.