Turnstone is a free desktop application that unifies AI work across models and apps while keeping all user data locally on their machine. It builds a persistent, shared brain from local folders, Gmail, browser history, and other connected sources so AI agents retain context without cloud storage. The tool leverages existing AI subscriptions, eliminating the need for separate AI service fees.
Funding
Funding not disclosed
Founders
Product
Problem
Knowledge workers frequently switch between multiple AI models and applications, forcing them to repeatedly re-upload context, hunt through emails and files, and start conversations from scratch. This fragmented workflow wastes time, increases cognitive load, and risks losing important details across sessions. Additionally, many AI tools store user data in company clouds, raising privacy concerns for sensitive business information.
Solution
Turnstone is a local-first desktop platform that enables users to do all their work with AI across every model and app while keeping everything on their machine. The application continuously ingests local folders, browser activity, Gmail, Google Drive, Notion, iMessage, and other connected sources into a unified, persistent brain. Each of several specialized agents—covering email, projects, research, and personal tasks—shares this common brain, so knowledge gained in one context automatically improves performance in others. Users can invoke any AI model they already subscribe to, with Turnstone providing the orchestration layer and memory system at no additional cost. The platform works entirely on the user's Mac, storing all knowledge locally with no cloud copy maintained by Turnstone.
Target Audience
Primary users are knowledge workers, startup operators, and business professionals who work with multiple AI tools and need persistent context, privacy, and efficiency across their daily workflows.
Features
- Local-first architecture that stores all memory and context on the user's machine in ~/Library/Turnstone with no Turnstone cloud copy
- Unified brain shared across multiple specialized agents, enabling cross-context learning that makes each agent smarter over time
- Continuous ingestion from local folders, Gmail, Granola, browser history, Google Drive, Notion, and iMessage to keep agents current
- Model-agnostic integration that leverages existing AI subscriptions, including Claude Opus support displayed in the interface
- Agent-driven task execution that breaks work into visible multi-step workflows, such as drafting emails with retrieved context and follow-up items
- Built-in knowledge structuring that organizes People, Decisions, and Company Knowledge automatically from user activity