App profile & analytics · Utilities · Data updated 2026-10-04

Si4Keyboard

by 文焕陈 · $0.99 · Version 1.5

Availability On the App Store since May 2025 ↗

Top Paid, Utilities, Italy

Last updated

December 4, 2025

1.5

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.

About Si4Keyboard

Si4Keyboard is an utilities app developed by 文焕陈.

User Ratings

The app has no ratings yet.

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.

Description by 文焕陈 (from the App Store)

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.”

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Screenshots

Screenshots by 文焕陈, from the the App Store listing

Official page on the App Store

Alternatives to Si4Keyboard

Changelog of Si4Keyboard

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Developer information for 文焕陈

文焕陈

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App Store Rankings for Si4Keyboard

Top rankings

Rank	Country	Category	List
30	Italy	Utilities	Top Paid

Ranking history in Italy

Ranking history

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Technologies used by Si4Keyboard

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