SigilTTY vs ShellDiver

SigilTTY is a native terminal for iPhone, iPad, and Mac — an SSH client built for working with coding agents. Attach to the agents running on your own servers, see which are working and which are stuck, get alerted the moment one needs you, and answer out loud. Shells, SFTP, tunnels and keys are all here too, synced through iCloud. SigilTTY contains no language model and no chatbot. The agents are programs on your own servers — SigilTTY is the terminal you reach them with. YOUR AGENTS, ANYWHERE • Attach to the coding agents herdr runs on your servers, each with a live status dot • Every agent on every server in one list — in the sidebar on iPad and Mac, in its own tab on iPhone • Get alerted when an agent is blocked or done — on iPhone and iPad even with the app closed, end-to-end encrypted • Reply by voice: on-device, or with your own Volcengine, iFlytek or compatible speech-to-text key. The text is typed in for you to check — it never sends itself • Paste or drop files into the terminal to upload them • Requires the open-source herdr 0.8.0 or later on your server SERVER MONITOR • CPU, memory, disk, network and top processes for all your servers on one page • Sort any column and end a runaway process • Linux, macOS and FreeBSD — nothing to install on the server A REAL TERMINAL • GPU-accelerated rendering powered by Ghostty • Tabs everywhere; splits and broadcast input on Mac • Output highlighting for Cisco, Huawei/H3C and other network gear • Hundreds of color themes, with the whole app following your theme • CJK font selection and one-tap command snippets CONNECT • SSH with password, private key or hardware security key • Telnet, and USB serial console on Mac • Jump hosts and Quick Connect FILES & TUNNELS • SFTP file browser with preview • ZMODEM (sz / rz) right in the terminal • Local and remote port forwarding, SSH agent forwarding SECURITY • Credentials stay in the Keychain; optional Face ID / Touch ID for keys • FIDO2 security keys over USB-C or NFC, tested with YubiKey • Host key verification; a remote host must ask before touching your clipboard • Key Handoff: move a key to another device over your LAN, end-to-end encrypted • No ads. No analytics. No tracking. SYNC • Servers, folders, snippets, keys, known hosts and agent records sync with iCloud • English and Simplified Chinese Free to download. Feedback: support@sigiltty.com

With software, free is usually a question rather than an answer. Here it is arithmetic: no server of ours, no accounts, no analytics — nothing for a subscription to pay for. Sync, startup commands, port forwarding: all of it is in the app. WHERE YOUR KEYS LIVE In your device's keychain. ShellDiver has no account and no sign-in — there is simply nowhere on our side for anything of yours to sit. An Ed25519 key either travels with you through iCloud Keychain, end-to-end encrypted, or stays on this device behind Face ID. A Secure Enclave key is created inside the security chip. It cannot be read out — not even by ShellDiver — never leaves the device, and will ask for Face ID on every sign-in if you want it to. THE VAULT Instead of iCloud you can take syncing into your own hands: an encrypted file in a place you choose. A USB stick, a cloud folder, or your own WebDAV server, so Nextcloud, ownCloud, a Synology, an Apache with mod_dav. It works across different Apple IDs and carries the secrets with it: saved server passwords and private keys. Only your devices encrypt and decrypt. Whoever runs the storage location sees nothing but unreadable files. You add a second device with a QR code, without typing your passphrase there. THE TERMINAL It does not hang up because you looked somewhere else for a minute: the connection belongs to the session, not to the screen. The running build and the half-typed line are still there when you come back. Up to 20 sessions as tabs, terminals and files mixed. Real xterm emulation: colour, UTF-8, resizing that works — htop, vim and colourful logs look the way you expect. Plus search through the scrollback, your choice of monospaced font including Nerd Fonts, and five colour schemes. On iPhone there is a row above the keyboard with esc, ctrl, tab, arrows and a paste key, because a phone has no ⌘V. When the link drops, ShellDiver notices through keepalives and rebuilds it by itself. This is SSH, not Mosh: the new shell starts fresh. SIGNING IN WITHOUT GUESSING ShellDiver asks the server which methods it offers and works through whatever it holds credentials for. That covers publickey followed by keyboard-interactive — 2FA after the key — and equally a server that only offers keyboard-interactive while the host is saved as "password". One-time codes are never pre-filled and never stored. You confirm a host key once, by its fingerprint. Every connection after that checks it, and a key that has changed is refused rather than waved through. THROUGH A JUMP HOST When a server is only open on the inside, you give it a jump host — OpenSSH's ProxyJump. The jump host then forwards nothing but encrypted bytes and cannot read along; both sign-ins are signed on this device. So your key does not have to sit on the machine in between, and a Secure Enclave key works here too. FILES AND TUNNELS The SFTP browser downloads and uploads, whole folders included, renames, and deletes recursively. Local port forwarding brings a database or an admin interface onto this device. It listens on 127.0.0.1 only and cannot be reached from outside; each rule holds its own connection, so a tunnel does not fall with a terminal. WHAT YOU ALREADY HAVE Your ~/.ssh/config is imported, with each IdentityFile matched against the keys you have and any ProxyJump resolved; so is known_hosts, hashed entries as far as they can be matched. Keys come in as Ed25519, RSA or ECDSA — from the OpenSSH container, from PuTTY's .ppk (v2 and v3), and from the PEM family. A passphrase on the file is used once during import and not kept. Snippets are also the buttons above the keyboard — global or bound to one host, with a confirmation step if you want one. One per host runs by itself as soon as the shell is open. The backup is a JSON file you can read — secrets sit inside an encrypted block under a passphrase you choose. Without it nobody gets at them, us included.