ArcShell

ArcShell is a modern SSH terminal client for system administrators,
developers and on-call engineers. Everything runs on-device — no
account, no cloud, no telemetry. One-time purchase, no subscription,
no ads.

━━━ WHY ArcSHELL ━━━
You probably already have an SSH app. So why a new one? Because no
single Android terminal combines all of this:

• Own SSH-2 library (open source, Apache 2.0) — auditable crypto stack
• Post-quantum key exchange (ML-KEM-768 hybrid with X25519) — today,
not "coming soon"
• Dual-pane SFTP file commander, tmux reclaim, Telnet, USB-serial
(OTG), port forwarding, FIDO2 keys
• Presentation mode that streams your terminal to any browser with
server-side secret masking
• Zero telemetry, zero ad SDKs, zero tracker libraries
• One-time €7.99 — no subscription, no in-app purchases, no "pro
edition" paywall for features already shown in this description

ArcShell bundles in one app what usually requires three.

━━━ CONNECTIONS ━━━
• SSH-2 with password, public key, and FIDO2 authentication
• Post-quantum key exchange (ML-KEM-768 hybrid with X25519)
• Telnet and USB-serial (OTG adapter)
• Port-forwarding, TOFU (Trust-On-First-Use) host-key verification
• Quick-connect via ssh:// URIs and a one-tap home-screen widget

━━━ TERMINAL ━━━
• Built-in xterm-256color emulator — full 24-bit truecolor support
• No shell-out, no proprietary Linux runtime, no root required
• Multiple themes (Dracula, Monokai, Solarized, Nord, …) + plugin
system for custom palettes
• Volume-key font zoom, customisable cursor, optional haptic feedback

━━━ FILE COMMANDER ━━━
• Dual-pane file browser inspired by Total Commander / Midnight
Commander
• Sources: local storage, SFTP, USB-OTG (SAF), and Nextcloud via
Login Flow v2 (no raw WebDAV passwords, multi-account)
• Drag-and-drop upload / download, swipe-to-edit text files
• Bookmarks, sort by name/size/date, filetype group-by-category
• Bulk select, multi-delete, rename, chmod

━━━ tmux INTEGRATION ━━━
• Auto-attach on login with session picker for multi-session servers
• Reclaim banner: one tap takes a tmux session back from another
client
• Auto-rename tab to tmux session name; exclusive-attach mode

━━━ PRESENTATION MODE ━━━
• Live-stream your terminal over your local network to any browser
• One-time password protection; stream filters mask secrets (emails,
IPs, tokens, bearer tokens) before they leave the device

━━━ BACKUP & SYNC ━━━
• Encrypted backup to local storage or share-sheet destination
• Import SSH config from OpenSSH ~/.ssh/config files

━━━ PRIVACY & AUDITABILITY ━━━
• Zero telemetry — no analytics, no crash reporting, no tracker SDKs
• All hosts, keys and history encrypted at rest (SQLCipher, AES-256)
• App Lock via biometric or PIN
• SSH library open source (Apache 2.0) — full crypto stack auditable

━━━ ONE-TIME PURCHASE ━━━
ArcShell is €7.99 once. No subscription. No in-app purchases. No
"pro edition". No ads — not on the home screen, not in the terminal,
not anywhere. The purchase happens once through Google Play, and the
app ships ad-free from the first start.

━━━ LOCALIZATION ━━━
Translated into English, German, Spanish, French, Italian, Japanese,
Dutch, Portuguese, Simplified and Traditional Chinese.

━━━ FOR WHO ━━━
Sysadmins managing fleets of Linux servers; DevOps engineers on call;
embedded developers flashing USB-serial devices; power users who want
a proper terminal on their tablet — without yet another login-required
SaaS.

Feedback and bug reports: via Play Store or by email to
arcshell.app@arcan-it.de.