Show HN: Promptix – send selected text to any LLM from Mac apps with one hotkey (promptix.app)

Promptix is a new macOS utility that lets you send selected text from any app to an LLM with a single hotkey. Once invoked you can run built-in actions (Translate, Rewrite, Improve, Fix grammar, Summarize) or your own saved prompts; the app forwards only the selected text to the chosen AI service and returns the output inline. It supports any model compatible with the OpenAI API format — including OpenAI, Anthropic, Google, Mistral, Cohere, DeepSeek and local LLMs — and you can plug in your own API keys so requests go directly to the provider without hitting Promptix’s servers. For the AI/ML community this is a practical productivity bridge between desktop workflows and LLMs: it makes model-powered editing, translation and task automation instantly accessible from any Mac app and enables custom prompt pipelines without re-implementing integrations. Key technical implications include dependency on provider quotas and latency (handled by your chosen API key), privacy choices (only selected text is transmitted; no external storage), and the ability to use local models for offline processing. There’s a free tier with daily limits (lifted if you add your own API key) and a Pro option for heavier users, making Promptix a lightweight, flexible tool for rapid LLM-driven text tasks.