RewriteBar — AI Writing Toolkit for macOS

Hey everyone 👋 For the past year, I’ve been building RewriteBar, a lightweight macOS app that brings AI writing tools into any app on your Mac. It started because I often struggled with writing in English — especially when switching between apps like Mail, Slack, or Notes. So I built something small that could help me rewrite and improve text instantly without leaving where I was typing. One year later, it’s become a complete AI writing toolkit. ✨ What it does - Fix grammar and spelling errors that other tools miss - Simplify complex text - Adjust tone and style (formal ↔ casual) - Translate between 500+ languages and dialects - Expand or summarize paragraphs - Create your own custom AI actions (e.g., extract action items, turn notes into user stories, etc.) ⚡ Why it’s different RewriteBar runs directly from your macOS menubar — no browser tabs, no context switching. It supports 12+ AI providers (OpenAI, Anthropic, Gemini, Claude, Apple Intelligence, etc.), lets you plug in your own API keys, and works fully offline for local models. 💡 Tech Built natively with SwiftUI and optimized for macOS 14+ (Sonoma & Sequoia). Landing page and backend run on Next.js + Supabase.