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eQuantic UI
A C#-first UI framework that compiles to TypeScript — so .NET teams ship modern web apps without a second stack, a second team, or a second deploy story.
MIT licensed
No runtime shipped
SSR + hydration
Counter.cs
public class Counter : StatefulComponent{ private int _count = 3; public override VisualNode Build(...) { var row = new Row(gap: 12); row.Add(new Text($"{_count}")); row.Add(Button("+1", () => SetState( () => _count++))); return row; }}
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Back to home
eQuantic UI
A C#-first UI framework that compiles to TypeScript — so .NET teams ship modern web apps without a second stack, a second team, or a second deploy story.
MIT licensed
No runtime shipped
SSR + hydration
Counter.cs
public class Counter : StatefulComponent{ private int _count = 3; public override VisualNode Build(...) { var row = new Row(gap: 12); row.Add(new Text($"{_count}")); row.Add(Button("+1", () => SetState( () => _count++))); return row; }}
LIVE PREVIEW
3
WHY IT EXISTS
Three decisions the framework is built on
Write UI in pure C#Declarative components in the language your team already knows. Compiles to TypeScript, runs as JavaScript. Zero context-switching.
Server Actions, type-safeCall server methods from the client with full type-safety, automatic serialization, and built-in CSRF protection. No REST scaffolding.
Zero-runtime CSSStyles extract at compile time. No runtime parsing, no FOUC, no Tailwind JIT. Ships pure CSS — fast, cacheable, debuggable.
Write UI in pure C#Declarative components in the language your team already knows. Compiles to TypeScript, runs as JavaScript. Zero context-switching.
Server Actions, type-safeCall server methods from the client with full type-safety, automatic serialization, and built-in CSRF protection. No REST scaffolding.
Zero-runtime CSSStyles extract at compile time. No runtime parsing, no FOUC, no Tailwind JIT. Ships pure CSS — fast, cacheable, debuggable.
Write UI in pure C#Declarative components in the language your team already knows. Compiles to TypeScript, runs as JavaScript. Zero context-switching.
Server Actions, type-safeCall server methods from the client with full type-safety, automatic serialization, and built-in CSRF protection. No REST scaffolding.
Zero-runtime CSSStyles extract at compile time. No runtime parsing, no FOUC, no Tailwind JIT. Ships pure CSS — fast, cacheable, debuggable.
WHAT IT DOES
The five things a .NET team feels first
20+ production-ready componentsGrid with virtualization, Modal, Form, Table, Tabs, Combobox, Tree, Calendar, Toast — every primitive you ship a real app with. Themeable, accessible (WAI-ARIA), and tested.
Enterprise-grade hot reloadSave a C# file and the browser updates in place, keeping component state. The loop is as tight as the one your front-end team already has.
Set breakpoints in your UI codeSource maps carry the C# through, so the debugger stops in the file you wrote — not in generated JavaScript you have to reverse-engineer.
Compile-time styles, runtime speedCo-locate styles with components — they ship as a static stylesheet. No runtime parsing, no extra JS, no class-name prop drilling.
Call your backend like a local methodAnnotate a C# method with [ServerAction] and call it from a button onClick. Args serialize, types flow, errors propagate. CSRF & auth handled.
20+ production-ready componentsGrid with virtualization, Modal, Form, Table, Tabs, Combobox, Tree, Calendar, Toast — every primitive you ship a real app with. Themeable, accessible (WAI-ARIA), and tested.
Enterprise-grade hot reloadSave a C# file and the browser updates in place, keeping component state. The loop is as tight as the one your front-end team already has.
Set breakpoints in your UI codeSource maps carry the C# through, so the debugger stops in the file you wrote — not in generated JavaScript you have to reverse-engineer.
Compile-time styles, runtime speedCo-locate styles with components — they ship as a static stylesheet. No runtime parsing, no extra JS, no class-name prop drilling.
Call your backend like a local methodAnnotate a C# method with [ServerAction] and call it from a button onClick. Args serialize, types flow, errors propagate. CSRF & auth handled.
20+ production-ready componentsGrid with virtualization, Modal, Form, Table, Tabs, Combobox, Tree, Calendar, Toast — every primitive you ship a real app with. Themeable, accessible (WAI-ARIA), and tested.
Enterprise-grade hot reloadSave a C# file and the browser updates in place, keeping component state. The loop is as tight as the one your front-end team already has.
Set breakpoints in your UI codeSource maps carry the C# through, so the debugger stops in the file you wrote — not in generated JavaScript you have to reverse-engineer.
Compile-time styles, runtime speedCo-locate styles with components — they ship as a static stylesheet. No runtime parsing, no extra JS, no class-name prop drilling.
Call your backend like a local methodAnnotate a C# method with [ServerAction] and call it from a button onClick. Args serialize, types flow, errors propagate. CSRF & auth handled.
THE LIBRARY22 components, not a starter kit
Grid
DataTable
DataTree
DataForm
InputCombobox
InputDatePicker
InputModal
OverlayDrawer
OverlayToast
OverlayTabs
NavigationMenu
NavigationBreadcrumb
NavigationCard
LayoutSplitter
LayoutStack
LayoutCalendar
DateScheduler
DateChart
VizProgress
FeedbackSkeleton
FeedbackAvatar
DisplayBadge
DisplayGrid
DataTable
DataTree
DataForm
InputCombobox
InputDatePicker
InputModal
OverlayDrawer
OverlayToast
OverlayTabs
NavigationMenu
NavigationBreadcrumb
NavigationCard
LayoutSplitter
LayoutStack
LayoutCalendar
DateScheduler
DateChart
VizProgress
FeedbackSkeleton
FeedbackAvatar
DisplayBadge
DisplayGrid
DataTable
DataTree
DataForm
InputCombobox
InputDatePicker
InputModal
OverlayDrawer
OverlayToast
OverlayTabs
NavigationMenu
NavigationBreadcrumb
NavigationCard
LayoutSplitter
LayoutStack
LayoutCalendar
DateScheduler
DateChart
VizProgress
FeedbackSkeleton
FeedbackAvatar
DisplayBadge
DisplayMEASURED ON A HELLO-WORLD APPBundle size & TTI
LOWER IS BETTER
eQuantic.UIUS
18 kB142 ms
React + Redux
64 kB410 ms
Angular
132 kB720 ms
Blazor WASM
1450 kB2100 ms
WHY .NET TEAMS PICK ITOne stack, not twoMost .NET shops end up with a JS stack they barely maintain — one team in C#, another in TypeScript, two CI pipelines, two deploy stories. eQuantic.UI collapses that into the stack you already run.
One language, end-to-endThe model, the endpoint and the button that calls it are all C#, reviewed by the same people, in one repository.
Zero JS-runtime overheadThe framework compiles away. What ships is JavaScript your browser runs and CSS it caches — not an interpreter.
Production-grade toolingHot reload that keeps state, breakpoints in your own files, and the .NET build you already have in CI.
Owned, not rentedMIT licensed, on NuGet, and used by the products in this catalogue — including the site you are reading.
WHY .NET TEAMS PICK ITOne stack, not twoMost .NET shops end up with a JS stack they barely maintain — one team in C#, another in TypeScript, two CI pipelines, two deploy stories. eQuantic.UI collapses that into the stack you already run.
One language, end-to-endThe model, the endpoint and the button that calls it are all C#, reviewed by the same people, in one repository.
Zero JS-runtime overheadThe framework compiles away. What ships is JavaScript your browser runs and CSS it caches — not an interpreter.
Production-grade toolingHot reload that keeps state, breakpoints in your own files, and the .NET build you already have in CI.
Owned, not rentedMIT licensed, on NuGet, and used by the products in this catalogue — including the site you are reading.
THE STACKDrops into what you already run
RUNTIME
.NET 8 / 9Bun (build)Roslyn analysersMSBuild
FRONTEND OUTPUT
TypeScript 5+Web componentsESM modulesSSR + hydration
HOSTING
ASP.NET CoreStatic + SSRAzure / AWS / VercelEdge runtimes
TOOLING
Rider / VSHot reloadF12 debuggerOpenTelemetry hooks
RUNTIME
.NET 8 / 9Bun (build)Roslyn analysersMSBuild
FRONTEND OUTPUT
TypeScript 5+Web componentsESM modulesSSR + hydration
HOSTING
ASP.NET CoreStatic + SSRAzure / AWS / VercelEdge runtimes
TOOLING
Rider / VSHot reloadF12 debuggerOpenTelemetry hooks
RUNTIME
.NET 8 / 9Bun (build)Roslyn analysersMSBuild
FRONTEND OUTPUT
TypeScript 5+Web componentsESM modulesSSR + hydration
HOSTING
ASP.NET CoreStatic + SSRAzure / AWS / VercelEdge runtimes
TOOLING
Rider / VSHot reloadF12 debuggerOpenTelemetry hooks
FROM THE COMMUNITYWhat people are saying about it
“This initiative has a huge potential.”
WC
Willian CésarSoftware Engineer
“This initiative has a huge potential.”
WC
Willian CésarSoftware Engineer
GET STARTEDFrom zero to running app in 60 seconds
# Install the templatedotnet new install eQuantic.UI.Templates# Scaffold a new appdotnet new equi-app -n MyAppcd MyApp# Run with hot reloaddotnet watch run
QUESTIONS ENGINEERS ASKThe framework, honestly
One language, all the way down
Install the template, scaffold an app, and watch C# become the JavaScript your users actually run. MIT licensed, on NuGet today.
Ready to ship something real?
Book a 30-minute discovery call. We'll tell you within the hour whether we're the right partner — or who is.
Ready to ship something real?
Book a 30-minute discovery call. We'll tell you within the hour whether we're the right partner — or who is.
Building enterprise-grade products, libraries and software that scale globally. A technology laboratory based in Portugal.
PRODUCTS
Building enterprise-grade products, libraries and software that scale globally. A technology laboratory based in Portugal.
PRODUCTS