Show HN: Castword – Native GNOME overlay for voice dictation and text rewriting (shapemachine.xyz)

A new application called Castword has been launched, providing a native GNOME overlay for voice dictation and text rewriting. Triggered by a global keyboard shortcut (Super+Shift+W), users can paste or type text, select a desired tone from seven built-in options—such as Professional, Flirty, and Direct—and receive the rewritten text, formatted to show modifications in a word-level diff view. The app offers versatile output choices, including direct pasting, clipboard storage, or in-place replacement, making it a valuable tool for enhancing productivity across various applications. This innovative tool is significant for the AI/ML community as it integrates advanced AI providers, such as OpenAI's GPT-4o and Anthropic's Claude, allowing seamless provider switching without restarting the application. The infrastructure also supports a Speech-to-Text feature that utilizes OpenAI’s Whisper for transcribing audio input. With secure API key storage via GNOME Keyring and automatic silence detection for recordings, Castword combines user-friendly functionality with sophisticated AI capabilities, appealing to both casual users and developers seeking enhanced text interaction tools.