I have full confidence in the integrity of this review site, so you might care to take a look at it:
https://www.expertreviews.co.uk/home/1407418/best-video-doorbell
As is indicated there, although you can always view 'live action' from a smartphone for free, with most video doorbells you need to subscribe to an online service to have video content recorded for later viewing.
Some such doorbells though, such as the Eufy model that tops the ratings in my link, come with their own memory units, which record video for free.