Lemon

Lemon is a desktop AI assistant built around a simple observation: most people speak far faster than they can type. Instead of adding another chat interface, Lemon lives in a small notch at the top of your screen and works at operating-system level, which means it can type into whatever text field you currently have focused — an AI chat window, an email composer, a Slack thread, a CRM note or a document editor.

The core feature is voice-to-prompt. Hold a hotkey, talk through what you actually want — including the messy parts — and Lemon shapes it into a structured prompt with a clear goal, context and constraints. For everyday writing, it also offers straightforward dictation: your exact words appear in a fraction of the typing time, with "ums", repetition and dead ends automatically removed.

Lemon is available for macOS (13 and above) and Windows and is free to start with no credit card required. The company positions it as a speed layer for knowledge work rather than a replacement for AI assistants themselves — you keep using ChatGPT, Claude or Cursor, and Lemon simply gets your intent into them faster and more clearly.