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Spec-driven infrastructure for multi-agent coding.

A local-first kanban any MCP agent can claim cards from.

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// What you get

Everything you need to ship faster.

Board. Every project, every stage, every agent — on one surface.
Spec0 — commitly
// How it works

Purpose-built for engineers running many agents.

A kanban where each card carries its own contract.

01

The card is the contract.

A card carries a requirement, a design, tasks, and verifications. Nothing ships until all four clear.

02

You stay the architect.

You write the spec. You approve the result. The agent fills the middle.

03

Any agent. Over MCP.

Spec0 speaks MCP. So do Claude, Codex, and Cursor. The next one will too.

04

Audit everything.

History shows who did what. Commits show what changed. Both live on disk.

// vs. the rest

We didn't build a faster agent. We built the workflow agents were missing.

Cline and Vibe Kanban are agent harnesses. Spec0 is the structure around them.

  Spec0 Cline Kanban Vibe Kanban
The spec      
Spec as the contract ✓ 1 1
Cards wait on a queue. Agents claim. ✓ 2 2
The agents      
Bring your own agent ✓ 3 3
Many agents, one card ✓
Your agents stay yours ✓ 4 4
The trail      
Audit log on your disk ✓ 5
Replay any card, end to end ✓ 5
Zero cloud, zero telemetry ✓ ✓ ✓
1 Cline cards and Vibe Kanban issues are free-form text. Spec0 specs are typed and structured — every agent reads them the same way.
2 In Cline and Vibe Kanban, you launch one agent at a time — the human picks the agent, presses play, and the run starts. In Spec0, cards live on a queue. Any agent can claim a card on its own schedule, and multiple agents can pull in parallel.
3 Cline supports a fixed list of CLIs. Vibe Kanban ships 10+ pre-baked agents but can't be extended. Spec0 is an MCP server — any MCP client connects.
4 Cline spawns the CLI and owns the worktree. Vibe Kanban owns each agent's workspace (branch, terminal, dev server). Spec0 stays out of your agent's process.
5 Vibe Kanban records per-issue diffs and inline comments. Spec0 writes a signed event log to disk — replayable end to end.
// Works with

Anything that speaks MCP

// Fit check

Built for one dev.

You'll love it if
  • You run 2+ coding agents in parallel.
  • You ship several projects at once.
  • You want a plan, not a prompt.
  • You prefer small sharp tools.
Skip it if
  • You need multiplayer.
  • You want a diff viewer or PR flow.
  • You want Spec0 to run your agents.
  • You're already happy in Linear.
// FAQ

The three questions you'd ask.

Does Spec0 run my agents?
No. Agents run in their own process. Spec0 exposes localhost:7474/mcp; they claim from it.
Does my code leave my machine?
Never. No server, no telemetry, no account.
Which agents work with it?
Anything that speaks MCP. Claude Code, Codex CLI, Cursor, Windsurf, and OpenCode work today.
{0}

Spec it. Ship it.

Free download. No signup. Your data never leaves your laptop.

Download for macOS
Questions? Email hi@spec0.dev.