Compare code sandboxes
Celesto vs Cosmonic
Two code sandboxes tools for AI agents, side by side. Facts come from each tool's own site.
Celesto
celesto.aiHardware-isolated cloud computers for AI agents, with browser, desktop, shell and file access, pause, resume and forking, via CLI and SDK; Apache-2.0 microVM core you can self-host.
Visit Celesto
Cosmonic
cosmonic.comWebAssembly sandboxes for agent code, MCP servers and tools, with no access until you grant it: the free Cosmonic Desktop app (public beta) and Cosmonic Control for Kubernetes. Open source core: CNCF wasmCloud.
Visit Cosmonic| Celesto | Cosmonic | |
|---|---|---|
| What it does | Hardware-isolated cloud computers for AI agents, with browser, desktop, shell and file access, pause, resume and forking, via CLI and SDK; Apache-2.0 microVM core you can self-host. | WebAssembly sandboxes for agent code, MCP servers and tools, with no access until you grant it: the free Cosmonic Desktop app (public beta) and Cosmonic Control for Kubernetes. Open source core: CNCF wasmCloud. |
| In their words | Celesto: Build agents. Give them real computers. | Cosmonic: Sandbox AI agents and tools |
| Open source | Yes | No |
| Website | celesto.ai | cosmonic.com |
| Link checked | 2026-10-20 | 2026-10-20 |
More options:Alternatives to CelestoAlternatives to CosmonicGuide: Best code sandboxes for AI agents
Keep comparing
