We built 40 multiplayer games, generating $1M in revenue and 30 million YouTube views in 12 months.
Today, we're opening up our tools.
The world's first programming language built for multiplayer game development:
With CSL, you no longer consider the client/server boundary, replicating game state, or client-side prediction. Instead, you write your game as though it were single player:
1. The client and the server both run the same code every frame.
2. The server is authoritative and replicates diffs of its memory over the network to clients to correct for divergence.
If you're a game developer, this is a dream come true. You get smooth client-side prediction, server authority, with no extra code. Plus, you can hot-reload and rewind while playing.
If you're a vibecoder this removes context overhead when working in multiplayer codebases. In Luau/C# codebases, we found the majority of the bugs models introduced were because of misunderstandings in where code was being executed and how state should be synced as games became more complex.
Codex and Claude Code with the CSL skill can one-shot complex multiplayer games that can be shipped to the world with a single click.
The All Out Editor:
Our editor will feel familiar to developers with Roblox or Unity experience, but includes features designed to dramatically accelerate world creation:
- 250,000 high-quality human-authored assets. Generate your own or remix existing ones in seconds.
- Built-in tile editor, terrain painting, and map prefabs.
- An epic MCP for world building, scripting, and testing.
The All Out Platform and Community:
We've built a community of hundreds of thousands of players with 30,000 playing each day and our first third-party game developer selling $6,000 of game passes in one month.
We handle servers, matchmaking, data persistence, and social, and you can monetize with in-game products and revenue sharing.
The team is cracked and we're shipping daily.
If you'd like early access to the dev platform, send me a DM with your All Out username.