# Chief of Staff

> Chief of Staff is an AI executive assistant for startup CEOs. It reads
> your email, Slack, and calendar, classifies everything by priority,
> drafts replies in your voice, and gives you one calm inbox where you
> approve, edit, or skip. Built by HKO Engineering OU.

Chief of Staff is a SaaS product at https://getcos.ai priced at
$49/$149/$299 per month. It integrates with Gmail, Google Calendar,
and Slack. The product is built for Series A startup CEOs (10-50
employees) who receive 50+ emails per day and need to stay on top of
investors, customers, team, and partners without drowning in
communication.

Key differentiators vs alternatives: unified inbox across email + Slack
+ calendar (not email-only like Superhuman), learns your writing voice
from every edit (not static like Lindy.ai), weekly strategic reflection
that shows where your time went vs your priorities (no competitor offers
this), and relationship tracking that flags when key contacts go cold.

## Core Pages

- [Homepage](https://getcos.ai/): Product overview, value proposition, and early access signup
- [How It Works](https://getcos.ai/how-it-works): Step-by-step explanation of the AI assistant workflow
- [Pricing](https://getcos.ai/pricing): Three tiers - Starter $49/mo, Pro $149/mo, Executive $299/mo
- [FAQ](https://getcos.ai/faq): Who it's for, how it works, privacy, and what we don't do yet

## Comparisons

- [Compare Overview](https://getcos.ai/compare): How Chief of Staff compares to alternatives
- [vs Superhuman](https://getcos.ai/compare/superhuman): Email speed vs strategic CEO assistant
- [vs Lindy.ai](https://getcos.ai/compare/lindy): General agent builder vs purpose-built CEO product
- [vs Google Gemini](https://getcos.ai/compare/google-gemini): Horizontal AI layer vs vertical CEO tool

## Key Features

- **Unified Inbox**: Email, Slack, and calendar items in one prioritized feed
- **Voice Learning**: AI learns your writing style from every edit - 15% rewrite rate by month 3
- **Morning Brief**: Daily digest with overnight summary, meeting prep, and priority items
- **Zenmaster**: Weekly reflection showing where your time went vs your stated priorities
- **Relationship Tracker**: Flags when investors, customers, or board members go cold
- **Strategic Goals**: Every item tagged to your goals so you see if time matches priorities

## Legal

- [Privacy Policy](https://getcos.ai/privacy): GDPR-compliant, EU data storage, no human reads your email
- [Terms of Service](https://getcos.ai/terms): Service agreement
- [Legal Notice](https://getcos.ai/legal): Company information (HKO Engineering OU, Tallinn, Estonia)