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What are the differences between State Management libraries in Angular?

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Understand the problem

Compare NgRx, Akita, Elf, and Signals-based state management.

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Study the solution

NgRx provides heavy, Redux-pattern state management suited for massive enterprise apps. Akita and Elf use RxJS stores with simpler, object-oriented APIs. Signals-based state represents modern Angular: lightweight, low boilerplate, and reactive without needing RxJS.

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Read the code

A clean, modern state store using Signals

import { Injectable, signal, computed } from '@angular/core';

export interface Todo { id: number; text: string; done: boolean; }

@Injectable({ providedIn: 'root' })
export class TodoStore {
  private state = signal<{ todos: Todo[]; filter: string }>({
    todos: [],
    filter: 'all'
  });

  todos = computed(() => this.state().todos);
  activeTodos = computed(() => this.state().todos.filter(t => !t.done));

  addTodo(text: string) {
    this.state.update(curr => ({
      ...curr,
      todos: [...curr.todos, { id: Date.now(), text, done: false }]
    }));
  }
}

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