# Deploy Blazor on Light Cloud

> Blazor builds interactive web UI in C# instead of JavaScript. Light Cloud detects it from a .csproj that references Blazor. It runs as a container that scales with traffic and down to zero when idle.

## Blazor at a glance

- **Detected from:** a `.csproj` that references Blazor
- **Runs as:** Container that scales with traffic and to zero when idle
- **.NET:** .NET 8.0, 9.0 or 10.0 (default 10.0), read from `TargetFramework`
- **Start command:** `dotnet <Project>.dll`
- **Port:** 8080, set through `ASPNETCORE_URLS`

## How to deploy Blazor

1. **Bring the code.** Pick a repository, upload a folder, or ask Claude Code or GitHub Copilot to put it online.
2. **Blazor, detected.** The files are read and the build is filled in. Every setting can be changed by hand.
3. **Built into a container.** An image is built and started, listening on the port the app expects.
4. **Live.** A light-cloud.io URL in minutes, a preview URL for every branch, and logs and metrics beside it.

## More on .NET

- [.NET](https://light-cloud.com/runtimes/dotnet): .NET 8, 9 or 10
- [ASP.NET Core](https://light-cloud.com/frameworks/aspnet): C# web apps and APIs

## Add a database

- [PostgreSQL](https://light-cloud.com/databases/postgresql): Shared or dedicated

## Questions

### How do I deploy Blazor?

Connect the repository, upload the folder, or ask Claude Code or GitHub Copilot to deploy it. Light Cloud reads the files, builds Blazor and returns a live URL in minutes, with a preview URL for every branch.

### How much does it cost to host Blazor?

The Free plan runs up to 3 server apps with $1 of usage a month and no card. A container is billed by the hour only while it runs, so an idle app costs nothing and a quiet one uses about $0.10 a month. Paid plans start at $5 a month with $5 of usage included.

### Can a Blazor app use a database?

Yes. Create a PostgreSQL database in the same project and set its connection string as DATABASE_URL. Databases come with paid plans, from $5 a month.

### Can I use my own Dockerfile instead?

Yes. A Dockerfile at the root of the repository always wins over detection: it is built as is and runs as a container.

Docs: https://docs.light-cloud.com/platform/frameworks/blazor
Page: https://light-cloud.com/frameworks/blazor
Deploy Blazor: https://console.light-cloud.com/new
Start free, no card: https://console.light-cloud.com/signup