# Promise vs Observable in Angular

Paul Tomoiu

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Angular,

frontend,

web

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Published 2022-12-03

This tutorial explains to you which are the main differences between a promise and an observable in Angular.

Into the following table you will see the main differences between a Promise and an Observable in Angular:

Promise	Observable
is based on a single value: resolved or fulfilled	is based on a stream of values
cannot be canceled	can be canceled
cannot be retried	can be retried
simpler to use	more complex
	Observable provides operators like map, forEach, reduce, etc similar to an array

In my opinion a Promise and an Observable are something very different and the usage is function of context. Sometimes you can use both of them, but an Observable mustn't necessarily be seen as an improvement of a Promise.