Public Beta · Free · macOS, Windows & Linux
Your agent wrote the code, but can you trust it?
We'll email your personal install link.
We'll only email you about Cosmonic Desktop.
Cosmonic Desktop runs AI-generated apps in a capability-driven WebAssembly sandbox on your machine: no file or network access and no keys unless you explicitly allow it. No account, no cloud, and no Kubernetes required.
Builder + your coding agent
Cosmonic Desktop includes an integrated MCP server that gives your coding agent the skills to compile your apps and deploy them into your local sandbox. Open the Builder, describe the app you want, and hand it to Claude Code, Codex, or the agent you already use.
Describe an app, hand it to your agent, and watch it reach Running.
Capability-driven security
Containers and seccomp run on ambient authority: a program inherits the permissions of whatever launched it. Cosmonic Desktop compiles your code to a WebAssembly component that begins with no authority at all: no filesystem or network access, not even a clock, until the host grants that capability.
Inspect the capabilities that your components want to use.
Open standards, no lock-in
Components ship as standard OCI artifacts and deploy through Kubernetes-style declarative manifests, the same manifest locally and in production.
The runtime inside Desktop is CNCF Incubating wasmCloud, so the boundary you trusted in development is the boundary that ships, on your infrastructure, with no proprietary platform in the loop.