Si4Keyboard is made and published by 文焕 陈. AppBrain is an independent app data site and isn't affiliated with 文焕 陈. The app name, icon, screenshots and description belong to 文焕 陈 and are shown as published on the App Store.
AppBrain's verdict
- Last updated
- December 4, 2025
- Size
- 13.6 MB
User feedback
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Store listing
By 文焕 陈, from the App Store
Screenshots by 文焕 陈, from the the App Store listing
Description by 文焕 陈 Written by the developer, not by AppBrain. Click to read.
Si4Key: Secure Your Input, Empower Your Identity
Si4Key is a privacy-first companion keyboard designed to enhance your existing input method with seamless local encryption, one-tap digital signature, and offline key management.
Whether you’re sending private messages, signing documents, or inputting sensitive data, Si4Key ensures that every keystroke stays secure — without changing how you type.
Key Features:
• Local-first encryption — your input never leaves your device
• Built-in support for OpenPGP/GPG digital signatures
• Offline key storage — no cloud syncing, you’re in full control
• Minimal and intelligent design — easy to use, smart when needed
• Supports multiple languages with future-ready architecture
Why Si4Key?
Because your input method deserves the same level of protection as your data. Si4Key doesn’t replace your keyboard — it strengthens it.
“Typing should be private. Signing should be simple. Si4Key makes both possible.”
Si4Key is a privacy-first companion keyboard designed to enhance your existing input method with seamless local encryption, one-tap digital signature, and offline key management.
Whether you’re sending private messages, signing documents, or inputting sensitive data, Si4Key ensures that every keystroke stays secure — without changing how you type.
Key Features:
• Local-first encryption — your input never leaves your device
• Built-in support for OpenPGP/GPG digital signatures
• Offline key storage — no cloud syncing, you’re in full control
• Minimal and intelligent design — easy to use, smart when needed
• Supports multiple languages with future-ready architecture
Why Si4Key?
Because your input method deserves the same level of protection as your data. Si4Key doesn’t replace your keyboard — it strengthens it.
“Typing should be private. Signing should be simple. Si4Key makes both possible.”
Safety and technology
Found in the app by AppBrain- Price
- $0.99
- App size
- 13.6 MB
- Content rating
- High
Technologies used by Si4Keyboard
Releases
Updates seen on the App Store- Version
- 1.5
- Launched
- May 2025
No changelog data
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About the app and developer
About Si4Keyboard
Si4Keyboard is an utilities app developed by 文焕 陈.
User Ratings
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App Information
Si4Keyboard costs $0.99. The app size is 13.61 MB. The latest version available is 1.5. The last update was on December 4, 2025.
Technical Requirements
The app has a content rating of High Maturity. The app has been available on the App Store since May 2025.
Developer information for 文焕 陈
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