Need Mobile SSH Termux Termius
Primary purpose Dedicated SSH, SFTP, local tunnel, and terminal client for Android. Android terminal emulator and Linux environment with APT packages. Modern SSH client across Android, iOS, desktop, and web-oriented team workflows.
Setup style Enter a host or save a server profile, then connect directly. Install packages such as OpenSSH, configure shell tools, and work from a Linux-like command line. Create or sync hosts, keys, snippets, and vault items through the Termius app/account model.
Android terminal controls Built-in extra key row, grid sessions, fullscreen panes, pinch zoom, text selection with copy/share, Gboard suggestions, voice input, and tmux-aware scrolling. Powerful terminal environment; terminal behavior depends on installed tools and configuration. Mobile keyboard add-on, gestures, tabs, autocomplete, snippets, and polished terminal UX.
File transfer Built-in SFTP dual-pane transfer tied to the active SSH session. Use command-line tools such as scp, sftp, rsync, or installed file utilities. Built-in SFTP and host/key management features.
Multi-session work Up to eight concurrent SSH sessions in an Android grid. Use terminal multiplexers such as tmux inside Termux or remote shells. Tabs and split-view style workflows, depending on platform and plan.
Data model Local-only saved servers, credentials, history, settings, and logs. Local Linux-like filesystem and packages inside the Termux app environment. Encrypted vaults for hosts, keys, snippets, forwarding rules, known hosts, and team sharing.
Best fit You want a simple Android app for connecting to servers, transferring files, and keeping sessions alive. You want a full command-line environment on Android and are comfortable installing/configuring packages. You want cross-device sync, polished productivity features, vaults, and collaboration.

Choose Mobile SSH when

You want direct SSH access from Android without setting up a full Linux environment or a cloud-synced account model. It is especially suited to saved servers, SFTP, tmux sessions, and quick local tunnel workflows.

Choose Termux when

You need package management, shells, compilers, scripting, rsync, curl, Git, Python, Node.js, or other Linux-style tools directly on the Android device.

Choose Termius when

You want a commercial, cross-platform SSH workspace with encrypted vault sync, team sharing, keychain management, snippets, and a consistent app on multiple devices.

Sources: Termux describes itself as an Android terminal emulator and Linux environment with APT packages and OpenSSH support on termux.dev. Termius describes Android SSH, SFTP, Mosh, Telnet, Serial, keyboard add-ons, SFTP, encrypted vaults, and key management on its Android page and vault documentation.