Angular Signals vs RxJS – Which One Should You Use?

In this tutorial, we will compare Angular Signal vs. RxJS features and when you should use each one.

Signals are used to simplify state management and improve performance. Traditionally, developers used RxJS.

What are Angular Signals?

Angular Signals are a reactive state management feature that automatically tracks dependencies. Angular automatically updates the UI whenever the value changes.

Example:

import { signal } from '@angular/core';
const count = signal(0);
function increment() {
  count.set(count() + 1);
}

What is RxJS?

RxJS is a library and It is used to handle asynchronous data streams using Observables.

Example:

import { of } from 'rxjs';

of(1,2,3).subscribe(value => console.log(value));

Note: RxJS is used for HTTP requests, event streams, and async operations.

Signals vs RxJS Comparision

When should you use Signals?

Now, you will see, when we should use Signals

1. When you need to manage local component state.
2. When you need to build UI state like counters or toggles.
3. When you need creating derived values with computed().
4. When you need optimizing performance.

Example:

count = signal(0);

When should you use RxJS?

Now, you will see, when we should use RxJS

1. You should use RxJS when working with HTTP requests.
2. You should use RxJS when working with WebSocket streams.
3. You should use RxJS when working with Event streams.
4. You should use RxJS when working with Complex async workflows.

Example:

this.http.get('/api/data').subscribe(data => {
  console.log(data);
});

Can Signals Replace RxJS?

No, Signals cannot fully replace RxJS.

Both have different purpose

1. Signals → It is used for UI state management.

2. RxJS → It is used for asynchronous data streams.

In Modern Angular App, you should use both based on the requirement.

Conclusion

Both Signals and RxJS are important in Angular.

Signals is used for state management.

RxJS is used to handle complex asynchronous streams.