The messaging assistant that started as RPLY grew up. NOX is a native macOS app — a personal AI agent that pulls iMessage, WhatsApp, Slack and email into a single inbox, then drafts replies that sound like you. It never hits send on its own. You edit, approve, or ignore.
What it actually does
NOX indexes every conversation locally on your Mac and tracks the boring stuff you forget: who you owe a reply, what you promised, what needs follow-up. Drafting uses cloud models by default, but you can flip a switch and run 100% on-device — no internet, nothing leaving the laptop. The longer you use it, the closer it gets to your punctuation, your tone, your voice with each person.
Why it’s worth watching
Personal AI inbox agents are 2026’s crowded consumer bet — Poke, Town, Rply-style tools all fighting for the same overwhelmed user. NOX’s angle is local-first plus voice-cloning, not auto-pilot. Built by Molly Cantillon’s five-person team, backed by the OpenAI Startup Fund, with a 250K+ waitlist before launch. The differentiation is trust: your messages stay on your machine, and the AI never speaks for you.
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