Turnstone

Turnstone is a desktop workspace that builds a shared memory, which it calls a Brain, from a user's files, connected apps and meetings, and lets AI agents use that memory so the user does not have to re explain context. The vendor says everything stays on the user's machine. Users ask questions or give tasks in a chat interface. The examples on the site show an agent searching Gmail, Google Drive, Linear and meeting notes to answer what was promised to a customer, then drafting a follow up email that uses the findings. Skills, connected apps and recurring Schedules let agents run routine work. Turnstone works across models and runs on AI subscriptions or API keys the user already has, including ChatGPT, Claude, Grok, Cursor and OpenRouter. Access is currently through a Get Access button. It is aimed at founders, operators and knowledge workers who juggle many tools and want agents that remember context across them. Pricing is listed monthly in US dollars. Free is $0 and uses the user's own AI subscription or API key, with initial Brain creation and 20 Schedule runs each month. Plus is $20 per month and adds managed Fast and Smart agents, unlimited Schedules and Brain Syncs, and unlimited use of a smaller model called Steady. Pro is $50 per month with 5 times the Plus usage, and Ultra is $100 per month with 15 times the Plus usage.