CASTRA
YOUR DIGITAL OUTPOST
Build and host web applications with native Blazor performance. From domain purchase to live site in a single click — no servers to manage, no infrastructure to configure.
Everything you need.
Nothing you don't.
Castra strips away the complexity of modern hosting and puts you in control of what actually matters — your application.
Applications run natively on the server using Blazor Server — no JavaScript framework overhead, no build pipelines, just raw .NET speed delivered directly to the browser.
Applications start on the server for instant load times, then automatically migrate to WebAssembly in the background. Server resources freed, experience unchanged.
Purchase a domain, point it at Castra, and your application is live. TLS certificates issued automatically on first request — no manual configuration ever required.
Launch from professionally designed templates — portfolios, event pages, galleries, and more. Each template is a fully working application ready to customise and go live.
Every application runs in its own sandboxed context with isolated storage. Your data is yours — no cross-contamination, no shared state, no surprises.
Register domains directly through Castra. From account creation to a live, branded website — one payment, one flow, minutes not days.
Built on .NET.
Fast by default.
Castra applications are compiled .NET assemblies running on a hardened Blazor Server infrastructure. No interpreted layers, no cold starts — just native execution with persistent server-side state.
Choose how your
application runs.
The same application, compiled once, deployable on either tier. Switch without redeployment.
Your application runs in the visitor's browser after an initial server-assisted load. Server resources released once migration completes.
- Runs entirely client-side after load
- Automatic migration from server on first visit
- No persistent server circuit
- Ideal for content-focused applications
- Lower cost tier
Your application logic stays on the server. Nothing sensitive is transmitted to the client. Full .NET performance with persistent circuit state.
- Application code never leaves the server
- Persistent SignalR circuit state
- Direct database access — no round trips
- Ideal for data-heavy or sensitive applications
- Maximum performance tier
Live in minutes.
Not days.
The complete path from idea to deployed application — handled entirely within Castra.
Create your account
Sign up and enter the Castra control panel. No credit card required to explore.
Register or connect a domain
Purchase a new domain directly through Castra, or point an existing domain with a single A record. TLS is handled automatically.
Choose a template or start fresh
Select from the template library for an instant starting point, or build from scratch with the visual editor.
Publish
Hit compile. Your application is built, stored, and served live on your domain — instantly.
Claim your outpost.
Castra is currently in active development. Early access is opening soon — be among the first to build on the platform.
ENTER CASTRA