MacAIProductivityWriting

Inline LLM Suggestions for Mac

Trigger AI rewrites in any Mac text field with bracketed phrases

Problem
Mac users who want AI polish usually copy text to ChatGPT and paste it back, or rely on AI built into a specific writing app. There is no unified lightweight way to invoke LLMs in any text input.
Solution
A Mac menu bar tool: type {prompt} in any text field and press a shortcut; it reads surrounding context and inserts or replaces the generated result inline. Supports custom prompt templates and model switching.
Users
Mac users and knowledge workers writing emails, documents, and social content
MVP
Menu bar resident; global hotkey listener; read current input context; use user's own API key; insert result inline; support 3-5 built-in templates.
Revenue
One-time purchase or subscription with bring-your-own API key; advanced tier adds team template sync and local models.
Why now
AI writing demand is widespread but tools are fragmented; Mac accessibility APIs are mature, letting indie developers ship a lightweight, privacy-friendly alternative fast.

Source discussions · 1

  1. Hacker NewsShow HN: Lacuna – open-source inline AI writing suggestions for your Mac1↑ 0
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