SpaceSpider vs Zellij

SpaceSpider is a desktop app built on Tauri 2 that renders a fixed grid of real PTY panes, with one AI coding CLI pinned per pane. You open it, create a space tied to a project directory, pick a grid preset, and assign Claude Code, Codex, Qwen Code, Kimi CLI, or a shell to each cell. It treats the terminal grid as a first-class native window, not as something that floats inside another terminal.

Zellij is a modern terminal multiplexer written in Rust, inspired by tmux and screen but built on WebAssembly plugins and a batteries-included layout system. It runs inside any terminal emulator, supports declarative KDL layouts, ships floating panes, a status bar, tabs, and an active plugin community. It is a natural upgrade path for developers who find tmux's config language painful but still want the multiplexer model.

TL;DR

• Zellij wins on cross-platform terminal multiplexing, plugins, layouts-as-code, and remote session support.
• SpaceSpider wins on zero-config AI CLI panes and a native desktop window with signed installers.
• Zellij runs anywhere a terminal runs; SpaceSpider runs as its own GUI on Windows and Linux.
• Choose based on whether you want a configurable multiplexer or a pre-made AI grid.

Feature matrix

Where Zellij wins

Zellij is an impressive multiplexer and competes fairly with SpaceSpider on several axes where Zellij is clearly ahead.

• Layouts as code. Zellij's KDL layout files describe an entire workspace declaratively, including which commands run in which pane. You commit the layout to your dotfiles and get the same workspace on any machine. SpaceSpider only persists spaces in app-local JSON.
• Plugin API. Zellij plugins are WebAssembly modules with access to the session. That enables things like session managers, fuzzy finders, and custom status bars. SpaceSpider has no plugin system.
• Floating and stacked panes. Zellij supports floating overlays and stacked panes, which are genuinely useful for scratch work. SpaceSpider only supports the documented grid presets with no resizable splitters.
• Runs inside any terminal. If your preferred terminal is Alacritty, Kitty, WezTerm, or something exotic, Zellij fits in. SpaceSpider replaces the terminal with its own Tauri window.
• Remote-friendly. Zellij survives ssh disconnects through session attach and reattach, just like tmux. SpaceSpider has no such mechanism.

Where SpaceSpider wins

• AI CLI catalog. SpaceSpider knows about Claude Code, Codex, Qwen Code, and Kimi CLI and detects which are installed via which or equivalent on Windows. The CliPicker shows a green dot for installed agents. In Zellij you paste commands into a layout file or run them by hand.
• Per-space working directory. Creating a space means picking a folder. Every pane inherits that cwd automatically. In Zellij you set cwd per pane in the KDL layout or type cd yourself.
• Native GUI window. SpaceSpider has its own window chrome, a home view of spaces, a new-space wizard, and system-level keyboard handling. Zellij is a TUI that inherits the limits of whatever terminal emulator you are using.
• Signed installers and auto-update. SpaceSpider ships signed Tauri artifacts and updates itself. Zellij updates follow your package manager.
• First-run time. From install to four AI CLIs on screen is essentially wizard time. Zellij can match that once you have a good layouts directory; until then it is config work.

When to pick Zellij

• You want a free, open-source multiplexer you can run on any machine including servers.
• You need detach and reattach for ssh sessions and will not accept losing PTYs when your laptop sleeps.
• You already keep your dotfiles in a repo and want declarative layouts checked in with them.
• You like experimenting with plugins and want to build your own WASM extensions.
• You are comfortable inside a TUI and do not need a native window.

When to pick SpaceSpider

• You are on Windows or Linux and want a polished GUI with AI CLI tiles, not a TUI inside PowerShell.
• You mostly run Claude Code plus one or two other agents and do not want to write layout files for that.
• You value one-click AI grid setup over plugin extensibility.
• You are not going to write KDL layouts by hand and do not want to learn them.
• You want signed auto-updates with a standard installer your IT team approves.

Can you use both?

Yes. SpaceSpider spawns normal PTYs, so Zellij runs cleanly inside a SpaceSpider pane. One reasonable pattern is to use SpaceSpider as the outer container for local AI CLIs on your workstation, and keep Zellij on remote servers you ssh into from a dedicated pane. That way you get SpaceSpider's AI catalog and grid ergonomics locally while preserving Zellij's detach and reattach on the machines that actually need it.

Another pattern is to use Zellij when you are on a machine without SpaceSpider installed, for example an ad-hoc dev container or a shared build box, and switch to SpaceSpider on your primary workstation. The two are not in conflict; they optimise for different locations.

FAQ

Is Zellij a better tmux?

For many users yes. The out-of-the-box experience is kinder, the config format is saner, and floating panes are genuinely useful. It is still a TUI, so it does not replace a native desktop app.

Does SpaceSpider support Zellij-style layouts-as-code?

Not today. Spaces are persisted as JSON via tauri-plugin-store, but there is no declarative layout file you can check into a repo. If that is critical, Zellij is the better choice.

Can I run the same AI CLIs in Zellij as in SpaceSpider?

Yes. Claude Code, Codex, Qwen Code, and Kimi CLI are all just shell commands; any multiplexer can host them. What you lose in Zellij is the auto-detect, the install hint tiles, and the pre-sized grid layouts.

Related reading

• SpaceSpider vs tmux
• SpaceSpider vs Windows Terminal
• One installer, four AI agents