Harker is a free Mac voice-to-text application that enables voice input at any time through global hotkeys in scenarios such as writing emails, documents, Slack conversations, and coding. It can be instantly activated, naturally recognize the voice context and punctuation, and transcribe locally and privately. The free version does not send audio and does not require an account. The paid premium version has functions such as AI writing style, formatting, and translation, such as style conversion, intelligent formatting, grammar correction, translation, and custom instructions.