Meet Turnstone

AI teammates that run on the subscriptions you already pay for​ OpenAI, Claude, Gemini, Grok or OpenRouter.

Backed by Combinator, alongside funds and angels from

• Pioneer Fund
• Robinhood Ventures
• UpScaleX
• OpenAI

Start with your Chief of Staff

Your first Agent runs the team. Tell it what you’re working on, and it sets up an Agent for each part of the job. Each one learns how you work and comes to you when it needs a decision.

Give every job its own Agent

Every Agent remembers how you like the work done. Put each one on the AI that’s best at it.

• Chief of Staff runs on GPT-6.1-Sol
• Outreach runs on Grok 4.7
• Launch writer runs on Opus 5.5
• Signups runs on GPT-6-Luna
• Engineer runs on Composer 2.5

Example Tasks

Chief of Staff: Brief me every weekday at 8 on my meetings, what I owe people and anything urgent.

Outreach: Draft a personal invite for everyone who asked for beta access.

Signups: 128 this week, 31 of them yesterday. Your LinkedIn post brought the most.

Engineer: Found it: links expired after 24 hours, not 7 days. One line changed, all 212 tests pass, nothing pushed.

- expiresIn: hours(24)
+ expiresIn: days(7)

Use the AI you already pay for

Sign in with the plan you have. Switch models in the middle of a conversation, and your Agent keeps its job and everything it knows.

How your team works

Your Agents pass work between them, use the web like you do, and handle the jobs that repeat.

Keeps up with your work

Turnstone reads the apps you connect, on a schedule you pick, and tells every Agent who said what, what changed and what was decided.

Your Mac. Your AI. Your data.

Turnstone is free forever on your Mac. It runs on the AI you already pay for, and what it learns stays with you.