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Si4Keyboard

文焕 陈 Utilities iPhoneiPadiPod touch

Si4Keyboard is a paid Utilities app for iPhone and iPad by 文焕 陈. Requires iOS 17.6. Updated December 4, 2025.

Price
0.99 USD
on the App Store
Size
14 MB
Age 17+
Updated
Dec 4
2025 · v1.5
Download on theApp Store

Screenshots

  • Si4Keyboard screenshot 1
  • Si4Keyboard screenshot 2
  • Si4Keyboard screenshot 3
  • Si4Keyboard screenshot 4

About Si4Keyboard

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.”

What’s new

Version 1.5 · Updated December 4, 2025

• **Keyboard Guide Feature** - New floating hint guide system to help users quickly learn keyboard usage. Interactive three-step guide covering key exchange, encryption, and decryption with automatic button highlighting and page navigation • **Optimized Key Selection** - When only one public or private key is available, the system automatically selects it by default, simplifying the user experience especially for first-time users • **Improved Key Selection UI** - Added select decryption private key functionality on the left side of keyboard for better accessibility and intuitive operation • **Enhanced Short Link Messages** - Improved hint messages during short link generation process with better multilingual display support • **Code Refactoring** - Refactored keyboard setup code structure for better maintainability and improved initialization flow • **Bug Fixes** - Fixed multiple known issues, improved application stability, optimized code performance, and reduced memory usage

App privacy

The developer, 文焕 陈, reported these privacy practices to Apple.

Data Not Collected

The developer does not collect any data from this app.