# Coo: Secret Messages — Secrets hidden in plain sight

> Secrets hidden in plain sight (iPhone/iPad app by yunchan cho.)

- Source: https://appshunter.io/ios/app/coo-secret-messages/id6801044565 (this page in markdown: same URL + `.md`)
- Developer: [yunchan cho](https://appshunter.io/developer/6789392314)
- Category: Utilities, Lifestyle
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 30 MB
- Languages: American English, Arabic, French (France), German (Germany), Indonesian, Italian, Japanese, Korean, Brazilian Portuguese, Russian and 6 more
- Released: 2026-08-24
- Data updated: 2026-10-01
- User reviews in markdown: https://appshunter.io/ios/app/coo-secret-messages/id6801044565/reviews.md

## What is Coo?

Keeping a relationship private at work—or simply not ready to make it public? Share a quiet conversation that stays between you and someone you trust.

Coo is not another messenger. Keep using the messaging apps you already know. Coo encrypts your private message on your device and places it inside text that looks like an ordinary sentence. Your connection opens that sentence in Coo to read the original message.

How Coo works
1. Write a private message in Coo.
2. Copy the ordinary-looking sentence Coo creates.
3. Paste and send it in your usual messenger.
4. Your connection opens it in Coo.

Privacy by design
• AES-256-GCM encryption runs on your device.
• Connection keys stay in each device's secure storage.
• Private messages are not uploaded to or stored on Coo servers, and Coo keeps no message history.
• Biometric or device lock and screen-capture protection help guard the screen.
• By default, an envelope opened once cannot be opened again on that device.

Use Coo for a confession, a surprise, or an address or account number you would rather not leave visible in a chat.

Free and subscription
The free plan includes one connection and three sends per day. Opening a message you receive is always free.

A subscription adds multiple connections, unlimited creation and sending, and a choice of alternate app icons. Encryption and privacy protections are identical on both plans.

[Subscription]
Monthly and yearly subscriptions are available. The price shown in the app is localized for your App Store region. Payment is charged to your Apple Account. The subscription renews automatically unless canceled at least 24 hours before the current period ends. You can manage or cancel it in your App Store account settings.
Privacy Policy: https://sendcoo.com/privacy
Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Monthly Unlimited | $1.99 | per month |
| Yearly Unlimited | $9.99 | per year |



## Version history (last 5 releases)

### 0.1.5 — 2026-09-16

Fixed an issue where the “Update required” message briefly appeared every time you opened the app.

### 0.1.4 — 2026-09-14

Fixed an issue that prevented messages copied from WhatsApp from opening.

### 0.1.3 — 2026-09-11

Improved envelope transport reliability in LINE and other messengers. You can use a short visible message, and existing envelopes remain readable.

We refreshed the subscription screen and Settings. Check your remaining allowance in Create Secret and add a connection directly from your connections list. Optional usage statistics help improve Coo without sharing message content. You choose whether to participate and can stop at any time in Settings.

### 0.1.2 — 2026-09-07

Try Coo’s core flow on your own before connecting with someone. Long secret messages now wrap more naturally by word for easier reading.

### 0.1.1 — 2026-08-28

On first launch, you can watch a localized introduction before starting the guide. A refreshed Stamps screen makes subscription benefits easier to compare, and subscribers can choose from seven Home Screen styles.

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*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 2026-10-01.*