There is no query layer
A query is a C# fragment. The engine compiles it and runs it in-process at full speed. There is no query language between your code and the graph. Edit the fragment; the result re-renders.
What the engine does
Every card links to the corresponding docs page.
The agent emits C#. The engine runs it.
Fallen-8 ships an MCP server, so an agent drives the same graph your team sees in F8 Studio. The agent emits a C# fragment; the engine compiles it, executes it in-process, and returns the result. Compiler diagnostics are fed back on a bad draft. No query-language layer to translate through, nothing to hallucinate around.
Run it yourself. No account, no login, no server of ours.
Fallen-8 is free first and foremost. Self-hosting is the primary way to use it: the engine, REST API, F8 Studio and MCP server are all MIT licensed and run on your own hardware. That means it runs wherever you need it to, today: sovereign European clouds, on-premises data centers, air-gapped networks.
docker run -d --name fallen8 \ -p 8080:8080 -v f8-data:/data \ ghcr.io/cosh/fallen-8-core:latest
dotnet add package Fallen-8
github.com/cosh/fallen-8-core
Fallen-8 runs in your browser
The engine is compiled to WebAssembly and runs client-side, in your tab. The playground graphs your own visit to the page: every file your browser fetched, which origin served it, and whatever you click. Your data never leaves your machine, because there is nothing to send it to: no account, no signup, no server allocated to you.
Or let us run it for you.
Fallen-8 Cloud is in development: managed instances, RAM-sized, save-game backups, F8 Studio included. The headline capability is sovereign deployment: instances will run in sovereign European clouds or on your own infrastructure, your choice. This will be a paid offering. It is how the project sustains itself; the engine stays MIT licensed and free to self-host.
Built in the open
Bug reports, feature discussions and pull requests happen on GitHub. The documentation lives at cosh.github.io/fallen-8-core. If fallen-8 is useful to you, you can support the work via GitHub Sponsors.
This site sets no cookies, loads nothing from third parties and does not track you. The playground runs entirely in your browser: your data never leaves your machine. And fallen-8 itself runs wherever you need it: self-hosted today in sovereign European clouds, on-premises or air-gapped, with sovereign deployment as a core feature of the upcoming managed offering.