MCP for Unity by Coplay is the most-starred open-source Unity MCP server, with about 15k stars on GitHub.
MCP for Unity gives your agent about 50 editor tools. Satura Space hands it the running game, and hands you four things no bridge has.
The agent sets up the moment and opens Unity's real Inspector on just the fields that matter. You tune it by feel.
Run agents in parallel, each in its own side Unity project, streamed beside the game. Open a Tuner on any of them.
Up to four synced editors, each streamed with its own input. One handle call starts every player on the same frame.
Ask about anything you don't know. Drift walks you through the UI, points at the field and explains what to tweak in the Inspector.
| Satura Space | MCP for Unity | |
|---|---|---|
| The Tuner: an Inspector scoped to what matters | ✓Yes | ✕No |
| Ask Drift: a guide that points at the field | ✓Yes, in alpha | ✕No |
| Parallel agents in side projects | ✓Scratchpads, one Unity each | Multi-instance routing |
| Multiplayer testing | ✓Four synced editors | ✕No |
| The running game, beside the agent | ✓Streamed, with your input | ✕Your own editor window |
| Agent plays and checks its work | ✓Handles, video and a report | ✕Not listed |
| Screenshots and video | ✓Both, 60 fps video | ✕Not listed |
| Play Mode control | ✓Yes | ✕Not listed |
| Run C# in the editor | ✓Yes, unity.exec | ✕Not listed |
| Run tests | ✓Yes | ✓Yes |
| C# hot-reload in Play Mode | ✓Method bodies | ✕Not listed |
| Unity runs hidden | ✓Yes | ✕Not listed |
| Your own agent (which ones) | ✓CLI agents | ✓Any MCP client |
| Works inside your IDE | ✕No, desktop app; Cursor connects over MCP | ✓Cursor, VS Code |
| Open source | ✕No | ✓Yes, MIT |
| Unity versions | Unity 6 only, Mono | ✓2021.3 to 6.x |
| Platforms | macOS Apple Silicon, Windows x64 | ✕Not listed |
| Price | $19/mo, $15 annual, 7-day trial | Free, MIT; assistant paid |
Yes, it is MIT-licensed. You still pay for your agent. Satura Space is $19 a month, or $15 billed annually, with a 7-day trial and no card.
No. The MCP package is the free bridge. Coplay's paid assistant runs inside the editor and now points to Aura.
MCP for Unity lists 2021.3 LTS through 6.x. Satura Space needs Unity 6, Mono scripting backend.
Try it for seven days. No card needed.