# NgRx Signal Store vs Classic NgRx in 2026: Which Should You Choose?

> A comprehensive comparison of NgRx Signal Store and Classic NgRx for Angular state management. Learn when to use each approach with practical code examples.

- Published: 2026-07-11
- Updated: 2026-07-11
- Author: SharpSkill
- Tags: angular, ngrx, state-management, signals, typescript
- Reading time: 9 min

---

NgRx Signal Store represents a fundamental shift in Angular state management, replacing the traditional Redux-inspired actions-reducers-selectors pattern with a signal-based reactive approach. This comparison examines both solutions to help Angular developers make informed architectural decisions in 2026.

> **Quick Decision Guide**
>
> Use **Signal Store** for feature-level state and medium-complexity apps where boilerplate reduction matters. Use **Classic NgRx** for enterprise applications requiring strict audit trails, complex side effects, and extensive DevTools debugging.

## Understanding the Architectural Differences

Classic NgRx follows the [Redux pattern](https://redux.js.org/understanding/thinking-in-redux/three-principles): actions describe events, reducers produce new immutable state, and selectors extract data. Every state change flows through a predictable, traceable pipeline.

Signal Store takes a different approach. Instead of dispatching actions through reducers, state lives in reactive signals. Updates happen through methods that call `patchState()`, and derived values come from computed signals rather than memoized selectors.

| Aspect | Classic NgRx | Signal Store |
|--------|--------------|---------------|
| Mental Model | Redux/Flux | Reactive Services |
| Boilerplate | High (actions, reducers, selectors, effects) | Low (state, methods, computed) |
| Reactivity | RxJS Observables | Angular Signals |
| DevTools | Full Redux DevTools | Signal Store DevTools (via plugin) |
| Learning Curve | Steep | Moderate |
| Bundle Size | Larger | Smaller |

For developers already familiar with [Angular Signals](/technologies/angular/interview-questions/angular-signals), Signal Store feels like a natural extension of the framework's reactive primitives.

## Classic NgRx: The Redux Pattern in Angular

Classic NgRx organizes state management around actions, reducers, selectors, and effects. This separation enforces predictability at the cost of verbosity.

```typescript
// books.actions.ts
import { createActionGroup, emptyProps, props } from '@ngrx/store';
import { Book } from './book.model';

export const BooksActions = createActionGroup({
  source: 'Books',
  events: {
    'Load Books': emptyProps(),
    'Load Books Success': props<{ books: Book[] }>(),
    'Load Books Failure': props<{ error: string }>(),
    'Add Book': props<{ book: Book }>(),
    'Remove Book': props<{ id: string }>(),
  },
});
```

The `createActionGroup` API groups related actions under a single source, improving DevTools readability and reducing boilerplate compared to individual `createAction` calls.

```typescript
// books.reducer.ts
import { createReducer, on } from '@ngrx/store';
import { BooksActions } from './books.actions';
import { Book } from './book.model';

export interface BooksState {
  books: Book[];
  loading: boolean;
  error: string | null;
}

const initialState: BooksState = {
  books: [],
  loading: false,
  error: null,
};

export const booksReducer = createReducer(
  initialState,
  on(BooksActions.loadBooks, (state) => ({
    ...state,
    loading: true,
    error: null,
  })),
  on(BooksActions.loadBooksSuccess, (state, { books }) => ({
    ...state,
    books,
    loading: false,
  })),
  on(BooksActions.loadBooksFailure, (state, { error }) => ({
    ...state,
    loading: false,
    error,
  }))
);
```

Reducers remain pure functions that return new state objects. The `on()` function handles action matching and state updates concisely.

```typescript
// books.selectors.ts
import { createFeatureSelector, createSelector } from '@ngrx/store';
import { BooksState } from './books.reducer';

export const selectBooksState = createFeatureSelector<BooksState>('books');

export const selectAllBooks = createSelector(
  selectBooksState,
  (state) => state.books
);

export const selectBooksLoading = createSelector(
  selectBooksState,
  (state) => state.loading
);

export const selectPublishedBooks = createSelector(
  selectAllBooks,
  (books) => books.filter((book) => book.published)
);
```

Selectors provide memoization automatically. The `selectPublishedBooks` selector only recomputes when the books array changes, making reads efficient even in frequently-updated stores.

## NgRx Signal Store: Signals-First State Management

Signal Store consolidates state, computed values, and methods into a single injectable service. The [official NgRx documentation](https://ngrx.io/guide/signals/signal-store) describes it as a "fully-featured state management solution with native support for Angular Signals."

```typescript
// books.store.ts
import { computed, inject } from '@angular/core';
import { patchState, signalStore, withComputed, withMethods, withState } from '@ngrx/signals';
import { BooksService } from './books.service';
import { Book } from './book.model';

interface BooksState {
  books: Book[];
  loading: boolean;
  error: string | null;
}

const initialState: BooksState = {
  books: [],
  loading: false,
  error: null,
};

export const BooksStore = signalStore(
  { providedIn: 'root' },
  withState(initialState),
  withComputed(({ books }) => ({
    publishedBooks: computed(() => books().filter((book) => book.published)),
    totalBooks: computed(() => books().length),
  })),
  withMethods((store, booksService = inject(BooksService)) => ({
    async loadBooks() {
      patchState(store, { loading: true, error: null });
      try {
        const books = await booksService.getAll();
        patchState(store, { books, loading: false });
      } catch (error) {
        patchState(store, { loading: false, error: 'Failed to load books' });
      }
    },
    addBook(book: Book) {
      patchState(store, ({ books }) => ({ books: [...books, book] }));
    },
    removeBook(id: string) {
      patchState(store, ({ books }) => ({
        books: books.filter((book) => book.id !== id),
      }));
    },
  }))
);
```

The entire feature's state management fits in one file. State properties become signals automatically, computed signals replace selectors, and methods replace action dispatches.

## Entity Management with withEntities

Both approaches support entity collections, but Signal Store's `withEntities` feature dramatically reduces code.

```typescript
// books-entity.store.ts
import { computed, inject } from '@angular/core';
import { patchState, signalStore, withComputed, withMethods } from '@ngrx/signals';
import {
  addEntity,
  removeEntity,
  setAllEntities,
  updateEntity,
  withEntities,
} from '@ngrx/signals/entities';
import { BooksService } from './books.service';
import { Book } from './book.model';

export const BooksEntityStore = signalStore(
  { providedIn: 'root' },
  withEntities<Book>(),
  withComputed(({ entities }) => ({
    publishedBooks: computed(() => entities().filter((book) => book.published)),
  })),
  withMethods((store, booksService = inject(BooksService)) => ({
    async loadBooks() {
      const books = await booksService.getAll();
      patchState(store, setAllEntities(books));
    },
    addBook(book: Book) {
      patchState(store, addEntity(book));
    },
    updateBook(id: string, changes: Partial<Book>) {
      patchState(store, updateEntity({ id, changes }));
    },
    removeBook(id: string) {
      patchState(store, removeEntity(id));
    },
  }))
);
```

The `withEntities` feature provides `ids`, `entityMap`, and `entities` signals automatically. Entity updaters like `addEntity`, `removeEntity`, and `updateEntity` handle collection mutations.

## Custom Store Features for Reusability

Signal Store's `signalStoreFeature` function enables cross-cutting concerns to be extracted and reused across stores.

```typescript
// with-request-status.ts
import { computed } from '@angular/core';
import { signalStoreFeature, withComputed, withState } from '@ngrx/signals';

type RequestStatus = 'idle' | 'pending' | 'fulfilled' | 'error';

export function withRequestStatus() {
  return signalStoreFeature(
    withState<{ requestStatus: RequestStatus }>({ requestStatus: 'idle' }),
    withComputed(({ requestStatus }) => ({
      isPending: computed(() => requestStatus() === 'pending'),
      isFulfilled: computed(() => requestStatus() === 'fulfilled'),
      isError: computed(() => requestStatus() === 'error'),
    }))
  );
}

export function setPending(): { requestStatus: RequestStatus } {
  return { requestStatus: 'pending' };
}

export function setFulfilled(): { requestStatus: RequestStatus } {
  return { requestStatus: 'fulfilled' };
}

export function setError(): { requestStatus: RequestStatus } {
  return { requestStatus: 'error' };
}
```

This custom feature can now be composed into any store that needs loading state tracking.

```typescript
// books-with-status.store.ts
import { inject } from '@angular/core';
import { patchState, signalStore, withMethods } from '@ngrx/signals';
import { setAllEntities, withEntities } from '@ngrx/signals/entities';
import { withRequestStatus, setFulfilled, setPending, setError } from './with-request-status';
import { BooksService } from './books.service';
import { Book } from './book.model';

export const BooksStore = signalStore(
  { providedIn: 'root' },
  withEntities<Book>(),
  withRequestStatus(),
  withMethods((store, booksService = inject(BooksService)) => ({
    async loadBooks() {
      patchState(store, setPending());
      try {
        const books = await booksService.getAll();
        patchState(store, setAllEntities(books), setFulfilled());
      } catch {
        patchState(store, setError());
      }
    },
  }))
);
```

The composed store now exposes `isPending()`, `isFulfilled()`, and `isError()` computed signals without duplicating logic.

## Component Integration Patterns

Signal Store integrates naturally with Angular's template syntax through signal reads.

```typescript
// books-list.component.ts
import { Component, inject } from '@angular/core';
import { BooksStore } from './books.store';

@Component({
  selector: 'app-books-list',
  standalone: true,
  template: `
    @if (store.isPending()) {
      <div class="loading-spinner">Loading books...</div>
    }

    @if (store.isError()) {
      <div class="error-message">Failed to load books</div>
    }

    @for (book of store.entities(); track book.id) {
      <div class="book-card">
        <h3>{{ book.title }}</h3>
        <p>{{ book.author }}</p>
        <button (click)="store.removeBook(book.id)">Remove</button>
      </div>
    }

    <p>Total: {{ store.totalBooks() }} books</p>
  `,
})
export class BooksListComponent {
  readonly store = inject(BooksStore);

  constructor() {
    this.store.loadBooks();
  }
}
```

No subscription management. No async pipes. Signals integrate with Angular's [zoneless change detection](/blog/angular/angular-19-zoneless-change-detection-performance) for optimal performance.

## Performance and Bundle Size Considerations

Signal Store's lighter architecture translates to smaller bundles. The core `@ngrx/signals` package adds roughly 4KB gzipped, compared to 15-20KB for the full classic NgRx stack (`@ngrx/store`, `@ngrx/effects`, `@ngrx/entity`).

Signal Store also benefits from Angular's signal-based change detection. Computed signals only recalculate when dependencies change, and components only re-render when consumed signals update. This granular reactivity eliminates unnecessary change detection cycles common in Observable-based patterns.

For applications already using [RxJS heavily](/blog/angular/rxjs-angular-operators-subjects-signals-interop), classic NgRx's Observable-based selectors integrate seamlessly with existing pipelines.

## Migration Strategy from Classic to Signal Store

Migrating an existing classic NgRx application doesn't require a big-bang rewrite. Both solutions can coexist, allowing incremental adoption.

- Start with new features using Signal Store
- Migrate isolated feature modules one at a time
- Keep complex, heavily-effectful features on classic NgRx if the migration cost exceeds the benefit
- Use the [NgRx Signals interop](https://ngrx.io/guide/signals) utilities to bridge between Observable-based and signal-based state

> **Coexistence Works**
>
> Classic NgRx Store and Signal Store can run side-by-side in the same application. The NgRx team officially supports both approaches and provides interop utilities for bridging between them.

## When to Choose Each Approach

### Choose Signal Store when:

- Building new Angular 20+ applications
- Managing feature-level or component-level state
- Prioritizing developer experience and reduced boilerplate
- The team has limited NgRx experience
- Bundle size matters

### Choose Classic NgRx when:

- Maintaining existing NgRx applications
- Requiring strict action logging and audit trails
- Building complex workflows with extensive side effects
- Needing full Redux DevTools time-travel debugging
- The team has deep NgRx expertise

For [state management fundamentals](/technologies/angular/interview-questions/state-management-basics), understanding both approaches prepares developers for diverse Angular codebases.

## Conclusion

- Signal Store reduces state management boilerplate by 60-70% compared to classic NgRx
- Classic NgRx remains the better choice for enterprise applications requiring strict audit trails and complex side effects
- Both approaches can coexist in the same application, enabling incremental migration
- Signal Store's computed signals provide automatic memoization without explicit selector definitions
- Custom store features (`signalStoreFeature`) enable reusable cross-cutting concerns
- For new Angular 20+ projects in 2026, Signal Store should be the default choice unless specific requirements demand classic NgRx

---

Source: SharpSkill (https://sharpskill.dev), tech interview preparation for your real stack.
HTML version of this page: https://sharpskill.dev/en/blog/angular/ngrx-signal-store-vs-classic-ngrx-comparison