Cindy is an open-source AI agent that works out of the box, with desktop and mobile apps for macOS, Windows, Linux, iOS, and Android. The project has about 3,232 stars on GitHub under the Apache-2.0 license and is actively developed in 2026. Rather than another chat window, Cindy is an agent that finishes real work inside your own projects and applications.
Cindy runs locally on your machine and works with your real files and logged-in apps. Its distinguishing design is flexibility: it brings multiple agent harnesses, models, and tools into one continuous workspace. The first supported harnesses are Claude Code and Codex, with more being added and a native harness in development, and models and harnesses can be mixed freely, even switching mid-task while your workspace, memory, skills, and tools stay continuous. A single job can be planned, executed in parallel, and reviewed by agents running different harness and model combinations. Cindy can drive your browser, computer, and phone, and can take on work arriving from messaging apps and schedules. You bring models your way: sign in to the official Cindy service, authorize the Claude Code or Codex plan you already pay for, connect your own API keys, or use local models.
The Cindy client is free and open source under the Apache-2.0 license. The optional official Cindy service charges for usage, and paid harness plans or API keys you connect remain billed by their own providers.
Cindy is for developers and power users who want one capable agent across all their devices, with the freedom to choose which models and coding plans power it.