Show HN: LetThemBuild – Claude Code, Codex, Gemini and OpenRouter in Parallel

LetThemBuild launched as a desktop app that runs Claude Code, Codex, Gemini and Grok in parallel, with one model leading a task while the others review the work, run checks and report exit codes on a per-answer receipt. The app works in a git worktree on macOS, Windows or Linux and supports the Claude Code, Codex, Gemini CLI and Grok Build subscriptions or any OpenAI-compatible endpoint, with runs steerable from the Mac, web, iPhone or a terminal via "ltb cloud." LetThemBuild offers four effort modes — Quick, Compare, Consensus and Deep — and states that nothing leaves the user's machine unless they choose the "Our Keys" option.

One leads. Three review the work, run checks, and show their evidence. All in your own checkout — Claude, ChatGPT, Gemini and Grok out of the box, or any of hundreds more through your own endpoint. Hand a task to the cloud from the Mac, the web, the iPhone, or ltb cloud in a terminal. Watch From Any Device Follow each step, approve a command and stop the run from whichever device is in your hand. The Mac can stay closed. The Whole Room Goes Too The lead does the work, the reviewers check it before it counts as done, and the warden looks at every action. Comes Back as a Branch Pull Back makes the work a branch of its own, Open PR opens a pull request, and Move Back to This Mac carries on here. Every review comes with a receipt. The commands each reviewer ran, and their exit codes, on the receipt under every answer. You see exactly what they checked, what passed, and what didn’t. “Looks good to me” doesn’t count: a reviewer that ran nothing is marked as one that ran nothing. The group works in a git worktree on macOS, Windows or Linux. Nothing leaves your machine unless you choose Our Keys, and the app says so before you do. ▾ MyProject src tests package.json $ ltb run "add rate limiting" › lead: building… › reviewers: running checks… › agreed ✓ exit 0 Your keys. Your CLI. Use our keys, bring your own, run on the Claude Code, Codex, Gemini CLI and Grok Build subscriptions you already pay for, or connect any OpenAI-compatible endpoint. Our KeysDefault Your CLI BYOK OpenAI-compatible endpoint Choose how hard they work. Quick for a question, Consensus for a change that matters, Deep when it has to be right. Or leave it on Default and the room decides from what you asked and what the lead actually did. QuickCompareConsensusDeep Quick · one model, one pass Compare · two models, one checking the other Consensus · everyone, until they agree Deep · the same room, twice as long Build at your desk. Steer from anywhere. LetThemBuild is the desktop app where the group builds. LetThemChat, on the web and iPhone, is the same account and the same sessions — for reading what they did, asking the group a question, and steering the next step. The documentation covers the whole product: how the room reaches agreement, what a reviewer has to do before it may agree, what the app is allowed to touch on your machine, and how the money works. No sign-up to read it.