CD Shell: SSH & SFTP Client

SchoolSpark

About this app

Manage your cloud infrastructure, hide your ports, and run complex bash scripts from anywhere. CD Shell is the ultimate zero-trust Android SSH and SFTP client, engineered specifically for developers, sysadmins, and IT professionals who demand uncompromising security and high productivity. Stop leaving Port 22 exposed to brute-force bots and take complete control of your servers.

🔥 ZERO-TRUST STEALTH (fwknop SPA)
CD Shell is one of the only modern Android terminals with a native, C++ powered Single Packet Authorization engine. Keep your server's firewall completely closed to the public internet. When you tap connect, CD Shell fires an invisible, cryptographically signed UDP knock to instantly open the firewall for your IP, establishes the SSH connection, and closes the door behind you—all in less than a second.

🛡 UNCOMPROMISING SECURITY ARCHITECTURE
Your credentials belong to you alone. CD Shell is built on a "trust-less" architecture:

Hardware-Backed Keystore: Private keys, passwords, and SPA keys are locked inside Android's Secure Element (StrongBox TEE). They never touch the app's memory in plaintext.

Encrypted Database: Your connection profiles and snippets are hardened by industry-standard SQLCipher AES-256.

Biometric Shield: A mandatory Fingerprint or Face ID challenge secures your vault.

Privacy Overlay: The UI is automatically blanked in the Android "Recent Apps" switcher to prevent shoulder surfing.

Zero Telemetry: No ads, no analytics, no third-party trackers. Your data never leaves your device.

💻 DESKTOP-CLASS TERMINAL CORE

Xterm.js Engine: Full 256-color support with flawless rendering for Vim, Tmux, and Htop. Bundled 100% locally for offline, air-gapped networks.

Accessory Bar: Instant access to Esc, Tab, Arrow keys, and modifiers (Ctrl, Alt) via a dedicated row above your keyboard.

Background Keep-Alive: Switch apps without dropping your connection. A highly optimized foreground service keeps your sockets alive.

Dynamic PTY Resizing: The terminal actively syncs dimensions with the remote server, ensuring text wrapping never breaks during rotation.

📂 SYSADMIN PRODUCTIVITY & SFTP

1-Click Remote DB Backups: Securely dump, compress (.zip), and download remote MySQL/MariaDB databases directly to your phone's local storage via SFTP in a single tap.

Visual SFTP Explorer: Browse, filter, and manage massive remote directories through an intuitive, native UI.

Integrated Text Editor: Edit remote configuration files in real-time without the need for manual downloads/uploads.

Snippet Library: Save frequently used scripts (e.g., docker-compose up -d) as quick-tap buttons.

On-Device Key Generator: Generate ultra-secure Ed25519 or RSA (up to 4096-bit) key pairs directly on your phone.

🎨 MODERN ANDROID UX
Built from the ground up with Jetpack Compose, CD Shell supports Edge-to-Edge displays, Predictive Back gestures (Android 13+), and Material You dynamic theming that adapts perfectly to your system wallpaper. Manage, edit, and back up your server profiles with a fluid, modern interface.

Designed, Engineered, and Hardened by Chinmoy Das.

What’s new

Bug fixes and performance improvements