Turnstone · House #23,416

What it is

Calls itself “AI workspace”.

• Calls itself: AI workspace

“Turnstone is the AI workspace where your agents know you.”

What it costs

Monthly subscription. A free tier, free forever. Prices quoted: $0.

• Monthly: yes
• Free plan: free forever
• Price: $0

“The Free Plan is $0 and includes your initial Brain plus 50 Schedule runs each month on your Mac.”

How it runs

A desktop app and mobile app for iOS and macOS. Runs locally and works offline. Distributed through the App Store. Offers an API. Open source. AI is the core of the product. You can bring your own API key.

• Kind: desktop · mobile
• Runs on: iOS · macOS
• Runs where: on the device, offline
• Distributed via: App Store
• API: yes
• Open source: yes
• AI role: core to the product
• Bring your own key: yes

“It all lives on your machine and runs on any model you already pay for.”

“Turnstone for iPhone”

What it works with

Names OpenCode and Turnstone for iPhone on its pages.

• Names: OpenCode · Turnstone for iPhone

“Bring your ChatGPT, Claude, Grok, or Cursor subscription, use your own API keys, access more models through OpenRouter, or use free open source models through OpenCode.”

“Turnstone is the AI workspace where your agents know you.”

What it offers as proof

Live, no waitlist. Backed by Y Combinator. Publishes a blog.

• Backer: Y Combinator

“Get personalized onboarding”

“Turnstone announces funding led by Y Combinator and others”