Superset vs Firstmate (2026): Agent Workspace vs the DIY Agent Distro
Compare Superset and Firstmate for orchestrating parallel coding agents. A purpose-built desktop workspace vs an open-source agent distro that runs on tmux.
Superset and Firstmate both answer "how do I get one conversation to fan out into a crew of parallel coding agents?" -- with almost opposite ingredients. Superset is an app: a desktop workspace with worktree isolation, diff review, automations, and remote hosts built in. Firstmate is not an app at all. It is an MIT-licensed "agent distro": a portable directory of instructions, skills, scripts, and conventions that turns a terminal agent you already run into an orchestrator that spawns and supervises crewmates in tmux windows and disposable Git worktrees.
At a Glance
| Superset | Firstmate | |
|---|---|---|
| What it is | Desktop workspace that runs 100+ AI agents in parallel with worktree isolation, chat, review, and browser | An "agent distro": instructions, skills, and scripts that make one agent orchestrate a crew |
| Form factor | App (desktop, CLI, MCP server) | A cloned Git repo; nothing to install |
| Core model | Workspace per task (worktree + terminals + review) | "First mate" agent spawns crewmate sessions, each in its own tmux window and worktree |
| Agent support | Any CLI agent (Claude Code, Codex, OpenCode, Cursor, Copilot, Gemini, Mistral Vibe, and more) | Claude Code, Codex, OpenCode, Pi, Grok, Kimi |
| Isolation | Automatic Git worktree per task | Disposable Git worktree per crewmate |
| Session backend | Built-in persistent terminals | tmux (or experimental Herdr/Zellij/cmux/Orca backends) |
| Remote | Remote and cloud workspaces across your network devices | Persistent "secondmates" on local or SSH-reachable hosts |
| Review / UI | Built-in diff/file editor, browser, chat | None -- output is PRs, local merges, or reports; you review in your own tools |
| License | Source-available (ELv2) | Open source (MIT), free |
What Is Superset?
Superset is a local-first desktop workspace for AI coding agents. It launches Claude Code, Codex, OpenCode, Cursor Agent, Copilot, Gemini CLI, Mistral Vibe, and other agent workflows inside isolated Git worktrees with persistent terminal sessions. Around that core, it adds a built-in diff/file editor, chat panel, in-app browser for docs and dev servers, port management, and MCP tooling. It also runs across your own network devices through remote and cloud workspaces, and it can schedule agent sessions as automations with a TypeScript SDK and a Slack bot. You can review inside Superset or jump into VS Code, Cursor, Windsurf, JetBrains, or Zed. Source-available under Elastic License 2.0 (ELv2).
What Is Firstmate?
Firstmate is an open-source "agent distro" -- its own words: "talk to one agent, ship with a crew." There is no app, CLI, or server; the cloned repository is the product. You point a terminal agent (Claude Code, Codex, OpenCode, Pi, Grok, or Kimi) at its AGENTS.md, bundled skills, helper scripts, and policies, and that agent becomes a "first mate" that spawns autonomous crewmates -- each in its own visible tmux window (or experimental Herdr, Zellij, cmux, or Orca backend) and its own disposable Git worktree -- supervises them through a zero-token event-driven watcher, and returns finished PRs, approved local merges, or investigation reports. Optional persistent "secondmates" run from isolated homes on local or SSH-reachable remote hosts, and project modes (no-mistakes, direct-PR, local-only) set the guardrails. It is MIT-licensed, free, and has picked up thousands of GitHub stars since mid-2026.
Key Differences
App vs Distro
This is the whole comparison in one line: Superset is software you run; Firstmate is behavior you install into an agent. Firstmate's approach is remarkably portable -- it works anywhere tmux and your agent CLI work, composes with other tools (it can even use Orca or Herdr as its session backend), and you can read every line of what it does. The cost is that everything visual is BYO: no diff review, no dashboard, no browser, no port management. Superset builds the environment; Firstmate assumes you already have one.
Supervision Models
Both fan work out to isolated worktrees. Firstmate's first mate supervises crewmates conversationally -- you talk to one agent, it manages the rest and reports back with PRs or summaries. Superset gives you direct visibility instead: every agent's terminal, diff, and status is a click away, and orchestration can be interactive or programmatic through the CLI, MCP server, and SDK. Delegation-through-conversation versus a control room -- some developers genuinely prefer the former's simplicity.
Reliability Surface
A distro built on prompts and shell scripts inherits the failure modes of both: agent instructions drift across harness versions, tmux quirks surface, and there is no vendor to file a ticket with. It also inherits their transparency -- nothing is hidden. Superset owns its stack end to end (terminals, worktree lifecycle, review, automations) and carries a product team, support, and enterprise compliance behind it. For personal experimentation the distro trade is often fine; for a team's daily workflow, owned infrastructure matters.
Automation
Firstmate runs when you talk to your agent; recurring work means wiring your own triggers, though its secondmates give it a persistent-worker story on remote hosts. Superset ships automations -- scheduled agent sessions with a TypeScript SDK and a Slack bot -- so nightly dependency bumps or triage runs happen without you in the loop.
Pricing
Superset offers a free tier and Pro at $20/seat/month. Firstmate is free and MIT-licensed with no company behind it. Both are bring-your-own-agent: model costs go to Anthropic, OpenAI, or your other providers either way.
Which Should You Choose?
Choose Superset if you:
- Want the crew visible: terminals, diffs, and status for every agent in one workspace
- Need built-in review, browser, automations, and remote/cloud workspaces
- Want scheduled unattended runs without wiring your own triggers
- Prefer a supported product for a team workflow
Choose Firstmate if you:
- Live in the terminal and like "talk to one agent, ship with a crew"
- Want a free, MIT, fully-inspectable setup with nothing to install
- Already have tmux (or Herdr/cmux/Orca) and your own review habits
- Enjoy customizing the orchestration logic itself -- it is all readable text
Verdict: Firstmate is the best expression of the DIY end of this space: a clever, transparent, free distro that turns any capable terminal agent into an orchestrator. But it deliberately stops at spawning and supervising -- environment, review, scheduling, and visibility are your problem. Superset is the purpose-built version of the same idea: parallel worktree agents with the workspace, review, automations, and remote reach already around them. Tinkerers should try Firstmate; teams shipping with agents every day will get further in Superset.
Frequently Asked Questions
Is Firstmate an app like Superset?
No. Firstmate is a repository of instructions, skills, and scripts -- an "agent distro" -- that an agent like Claude Code or Codex reads to become an orchestrator. Superset is a desktop workspace with the orchestration, terminals, and review built in as software.
Do both use Git worktrees?
Yes. Firstmate gives each crewmate a disposable worktree (or delegates worktree management to Orca when used as a backend). Superset creates an isolated worktree per task automatically and attaches persistent terminals and diff review to it.
Can Firstmate and Superset be used together?
Not as an integrated pair -- Firstmate's supported backends are tmux, and experimentally Herdr, Zellij, cmux, and Orca. Conceptually, though, Superset's own orchestration (agents launching agents through its CLI and MCP server) covers the same delegation pattern inside the workspace.
Is Firstmate free?
Yes -- MIT-licensed, no paid tier, no company. Superset has a free tier and Pro at $20/seat/month, with enterprise plans for teams.