Butler OS connects to your Microsoft 365 inbox, categorizes every email with AI, and drafts replies in your writing style. You review and send. That’s it.
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Set up in under 5 minutes · No app to install · Works inside your existing Outlook
Sign in with your Microsoft 365 account. No IT approval required for most organizations. No passwords stored.
Take a 3-minute voice quiz. Butler learns your tone, style, and categories.
New emails are auto-categorized in seconds. Drafts appear in your Outlook drafts folder.
Every plan includes a 7-day free trial. Cancel anytime.
billed as $$287.90/yr — 2 months free
billed as $$575.90/yr — 2 months free
billed as $$959.90/yr — 2 months free
Anyone who spends too much time in their inbox. Here are the people we built this for.
Stop wasting time sorting email. Let Butler handle the triage so you can focus on what matters.
AI reads every email and sorts it into your custom categories — Immediate Action, Skim Later, and everything in between.
Butler learns your writing style through a quick quiz, then drafts replies that sound like you — not a chatbot.
Email content is never stored — not in our database, not in logs, nowhere. Processed in memory and discarded.
New emails are categorized within seconds of arrival via Microsoft Graph webhooks. No polling, no delays.
Your email is sensitive. We built Butler OS with privacy as the foundation, not an afterthought.
Email content is processed in memory and immediately discarded. We never write your emails to any database or log file.
Your voice profile and OAuth tokens are encrypted at rest with AES-256-GCM. We can't read them without the master key.
Butler OS uses delegated Microsoft permissions. Most users sign in without any IT approval. If your org requires it, your IT admin can approve in one click.
Join professionals who save hours every week with AI-powered email triage and drafting.
7-day free trial · cancel anytime