cal-cool
Private secure messenger
Free · Designed for iPad. Not verified for macOS.
cal-cool is a private, secure messenger hidden behind a fully working calculator.
Open the app and you see a real calculator. Enter your secret PIN and press "=" — and your private messenger unlocks: encrypted chats, voice and video calls, disappearing messages and a set of everyday tools.
WHY CAL-COOL
• Honest privacy: end-to-end encrypted chats and calls
• Calculator disguise: your conversations stay invisible to prying eyes
• Panic PIN: a second PIN instantly opens a clean, empty profile
• Disappearing messages, screenshot protection, encrypted media
• Voice & video calls with VoIP push — battery friendly
• Offline P2P chat: exchange messages nearby via local network without internet
• Tools: notes, planner, weather, offline maps, voice notebook and more
• 3 languages: English, Russian, Arabic
SECURITY FIRST
Messages are encrypted in transit and at rest. We do not sell data, we do not show ads, we do not track you. Local data is protected with AES-GCM; the app locks itself behind the calculator whenever you leave it.
Note: the calculator really works — it is a fully functional calculator app AND a full-featured private messenger in one.
Ratings & Reviews
- This app has not received enough ratings or reviews to display an overview.
• Call stability: fixed dropped calls and one-way audio
• End-to-end encrypted 1-on-1 calls with four-emoji verification
• Complete English and Arabic interface translation
• New Aurora Noir theme
• Redesigned chat header: compact icons and last-seen status
The developer, Zheniy Shacc, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Provider
- Zheniy Shacc
- Size
- 84.8 MB
- Category
- Social Networking
- Compatibility
Requires iOS 15.5 or later.
- iPhone
Requires iOS 15.5 or later. - iPad
Requires iPadOS 15.5 or later. - iPod touch
Requires iOS 15.5 or later. - Mac
Requires macOS 12.4 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
16+
- 16+
- Contains
Unrestricted Web Access
Messaging and Chat
User-Generated Content
- Copyright
- © 2026 Calculator 616