# Cossi: AI Chief of Staff — Brief. Prep. Book. Private.

> Private AI Chief of Staff for proactive calendar, email, and relationship management. (iPhone/iPad app by SI Analytics.)

- Source: https://appshunter.io/ios/app/cossi-ai-chief-of-staff/id6768811974 (this page in markdown: same URL + `.md`)
- Developer: [SI Analytics](https://appshunter.io/developer/1896537963)
- Category: Productivity, Utilities
- Price: Free with in-app purchases
- Rating: 5.00/5 from 2 App Store ratings
- Age rating: 4+
- Requires: iOS 15.5 · 137 MB
- Languages: American English
- Released: 2026-05-28
- Data updated: 2026-08-27
- Monetization: freemium
- User reviews in markdown: https://appshunter.io/ios/app/cossi-ai-chief-of-staff/id6768811974/reviews.md

## What is Cossi?

You don't need another to-do app. You need someone who watches your calendar, your inbox, and your relationships — and tells you what matters before you ask.

That's Cossi: a private AI Chief of Staff that runs entirely on your phone. No cloud account. No data harvesting. No waiting to be prompted.

START EVERY DAY AHEAD
Open Cossi to a morning brief built from your real life: today's schedule, a pressure score for the day, the tasks that actually matter, relationships going quiet, and what slipped yesterday. Play it aloud while you get ready.

WALK INTO EVERY MEETING PREPARED
Minutes before each meeting, Cossi hands you a prep brief — the one thing to focus on, drawn from your calendar, prior notes, relationship history, and (if you opt in) recent email threads. After the meeting, capture notes in seconds. That context follows the same people into your next conversation.

GET BOOKED WITHOUT THE BACK-AND-FORTH
Share a booking link in one tap. Cossi finds your open slots, the other person picks a time — it adjusts to their timezone automatically — and the meeting lands on your calendar with a prep task attached. No more "does Tuesday work?"

NEVER LET A RELATIONSHIP GO COLD
Cossi tracks interaction health across meetings and email. When someone important is drifting, your brief flags it — and drafts the reconnect message for you. If tonight's meeting includes someone you haven't spoken to in six weeks, you'll know before you walk in.

AN AGENT THAT ACTS, NOT JUST ANSWERS
"Check my calendar and draft a decline for the 3pm conflict." Cossi's built-in agent reasons through multi-step requests using your data — and asks for approval before changing anything. Voice in, voice out.

YOUR INBOX, TRIAGED
Connect Gmail or any IMAP account. Urgent emails surface in your brief. Replies are drafted and queued for your review — nothing ever sends without your approval.

IT KNOWS YOUR LIMITS
Cossi measures your week's real capacity: committed meeting hours versus available focus time. Overbooked weeks get flagged. Your lightest day gets suggested for deep work. A short work-style questionnaire tunes everything to how you actually operate.

PRIVATE BY ARCHITECTURE
• AI runs on-device — your prompts never touch a server
• Zero telemetry, zero ads, zero tracking
• AES-256-GCM encrypted vault for passwords, keys, and private notes
• Post-quantum authentication (ML-DSA-65) — no password to steal
• One 24-word recovery phrase controls everything; it never leaves your device
• Cloud AI (Claude, OpenAI) is optional and uses your own key

FREE
Morning brief, chat, calendar, tasks, encrypted vault, post-quantum security.

COSSI PRO
Proactive Chief of Staff notifications, meeting prep briefs, relationship intelligence, email drafting, booking links, capacity insights.

Built for founders, operators, chiefs of staff, and anyone whose calendar runs their life. Cossi doesn't wait to be asked — it briefs you, preps you, and protects your time.

Your day, already handled.

## Key features

- Daily morning briefs
- Meeting preparation summaries
- Automated meeting booking
- Relationship interaction tracking
- AI-powered agent for tasks
- Inbox triaging and email drafting
- Personalized capacity insights

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Cossi Pro Monthly | $7.99 | per month |
| Cossi Pro Annual | $59.99 | per year |



## Frequently asked questions about Cossi

### What is Cossi?

Cossi is a private AI Chief of Staff that runs entirely on your phone. It proactively manages your calendar, inbox, and relationships to tell you what matters before you ask.

### Does Cossi have ads?

No, Cossi is ad-free. The app emphasizes privacy with zero telemetry, zero ads, and zero tracking.

### What are the subscription options for Cossi Pro?

Cossi Pro offers two subscription plans: Cossi Pro Monthly at $7.99 per month and Cossi Pro Annual at $59.99 per year.

### How does Cossi ensure privacy?

Cossi runs AI on-device, meaning your prompts never touch a server. It also features an AES-256-GCM encrypted vault and post-quantum authentication.

### What features are included in the free version of Cossi?

The free version of Cossi includes the morning brief, chat functionality, calendar integration, task management, an encrypted vault, and post-quantum security.

### How often is Cossi updated?

The latest version of Cossi is 1.6.0, which was last updated on June 27, 2026. Updates are frequent to enhance features and reliability.

### What devices does Cossi support?

Cossi is available on iPhone, iPad, and iPod. It is designed for iOS devices.

### What is the age rating for Cossi?

Cossi has an age rating of 4+, making it suitable for a wide range of users.

## Version history (last 5 releases)

### 1.9.6 — 2026-08-04

Faster people. Sharper hours.

· People — swipe right on a name to jot a note; swipe left to delete.
· Availability — pick the exact slots you want to offer before sending.
· Weekly — your review now flows to Cossi Desktop on the same LAN.
· Privacy — a clearer opt-in for anonymous stats, plus a new panel that shows your own cloud AI usage in Settings.
· Reliability across Brief, Chat, Email, Calendar, and Auth.

### 1.9.5 — 2026-07-20

Pair your Mac.
Cossi Desktop is now available on macOS as a companion for your morning brief, meeting prep, and weekly review. Open Settings → Devices → Pair Mac to scan the QR on your desktop.

Under the hood: post-quantum handshake (ML-KEM-768 + ML-DSA-65), session-word verification so both devices confirm identity, and everything happens on your local Wi-Fi with no relay involved.

### 1.7.0 — 2026-07-06

Updated UI with deduplication of features and cleanup/nesting of settings

### 1.6.0 — 2026-06-27

1.6.0 — four wins that change how Cossi feels.

• Demo mode — a 90-second preview of a Cossi day plays on first launch. See the brief, the Right Now action, the meeting prep, the commitment capture — before you import a single thing.
• Voice loop — hold the mic on the tab bar, ask Cossi anything, get a spoken reply. Hands-free in one tap, no settings to toggle.
• Smart morning push — your daily notification is now one specific imperative ("Send Sarah the pricing model before your 11am") instead of a fact dump.
• People — when Cossi has no phone or email for a contact, tap to pick one from your address book. Tap-to-text and tap-to-email work the first time, every time.
• Sharper, more honest error messages across every screen.

Background work: eval harness wired to Claude + OpenAI providers so we can prove model quality, not just claim it.

### 1.5.3 — 2026-06-21

1.5.3 ships a load of polish that materially changes how Cossi feels:

• Right Now button — one tap, one specific action, voiced aloud. Tap Do it to execute.
• Meeting prep notifications 30 min before each meeting — agenda, last commitment, attendee context.
• Urgent emails ship with a 1-line draft reply — tap to open mail app prefilled.
• Hero line on every brief — "4h of focus before your 2pm."
• Streaming markdown in Chat — bold and bullets form as Cossi types.
• Tap-to-text/call/email from People — Cossi opens the right surface.
• Contact import — real errors instead of silent failures, dedupe on insert.
• Dark mode legibility — tab bar, surface contrast, and Settings cards.
• Edit Event form no longer breaks times or bleeds under the tab bar.
• Onboarding rebuilt — three quick taps shape your brief from day one.
• Faster cold start and a smarter Pro paywall.

## More apps by SI Analytics

- [Vota Africa](https://appshunter.io/ios/app/vota-africa/id6768089487)

All apps by SI Analytics: https://appshunter.io/developer/1896537963

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-27.*