✨ The collaboration layer for AI coding

What if specs and AI agents were friends?

AI coding tools are single-player. Crux brings your team and AI together — from the first idea to the final commit.

See How It Works

AI gets involved too late

You write specs in Notion. Discuss in Slack. Track in Linear. Then copy-paste context into Claude.

By the time AI sees your code, it's missed all the decisions, constraints, and context that matter.

What if AI was in the room from day one?

feature-user-auth.md — Crux📄 User Authentication📄 API Endpoints📄 Database Schema📄 Error HandlingCOLLABORATORSAMSUser AuthenticationRequirementsAlexSarah2✨ AI SuggestionGenerate Plan →
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A better way to use those tools, not a replacement for those tools.

Works with Claude Code, Cursor, Copilot

How It Works

From messy idea to merged PR in three steps

Step 1

Draft Together

Write specs collaboratively in real-time. Comments, suggestions, @mentions. Everyone aligned before code begins.

Step 2

Review AI Plans

AI generates step-by-step plans from your specs. Review each step, approve or reject, add comments before building.

Step 3

Execute & Ship

Watch Claude Code bring your plan to life. Isolated worktrees, real diffs, full audit trail. Merge when ready.

Plan Review — User Authentication3/5 approved✓Create users table with email, password_hash, created_atDatabase migration • Approved by AlexApproved✓Implement bcrypt password hashing utilitySecurity • Approved by SarahApproved✓Create /api/auth/register endpointAPI Route • Approved by AlexApproved4Create /api/auth/login endpoint with JWTAPI Route • Waiting for reviewApproveRejectComment5Add session management and logout...Pending
Plan Review

Approve every step before it ships

AI generates implementation plans from your specs. Review each step, approve what looks good, reject what doesn't. No surprises in production.

  • Step-by-step approval workflow
  • Comments and feedback on each step
  • Full audit trail of decisions
Execution

Watch your plan come to life

Claude Code executes your approved plan in an isolated worktree. See real-time progress, review every diff, merge when you're ready.

  • Isolated git worktrees per execution
  • Real-time terminal output
  • Full diff review before merge
Execution — User AuthenticationRunningTerminal — Claude Code$ claude-code execute plan.json✓ Step 1: Create users table✓ Step 2: Password hashing✓ Step 3: Register endpoint→ Step 4: Login endpoint Creating src/api/auth/login.ts Writing JWT token logic...Progress: 4/5 stepsChanges — src/api/auth/login.tslogin.ts +48schema.ts +12utils.ts +812345678+ import { sign } from 'jsonwebtoken'+ import { compare } from 'bcrypt' + export async function POST(req) {+ const { email, password } = await+ const user = await db.query...+ const valid = await compare(...)+ const token = sign({ userId }...)3 files changed+68 additions-4 deletions✓ Merge ChangesView Full Diff

Built for teams that ship

Real-time Collaboration

Multiple cursors, live sync, presence indicators. Like Google Docs for specs.

Plan Review (Plannotator)

Approve, reject, or comment on each step before code is written.

Isolated Worktrees

Each execution runs in its own git worktree. No dirty main branch.

BYO Claude Code

Use your existing Claude subscription. We orchestrate, you execute.

AI in the Room

AI analyzes specs in real-time, suggests improvements, catches issues early.

Full Audit Trail

Every decision tracked. Who approved what, when, and why.

Ready to bring AI into the room?

Start collaborating for free. No credit card required.
Bring your own Claude Code subscription for execution.