That depends on your needs. If you are an iOS user and have an Apple Home hub already, you only need Reagle Gateway if you require the additional features of voice assistant integration (Alexa & Google Assistant)* or remote “Code” syncing.
As an iOS user without an Apple Home hub or as an Android user, getting a Reagle Gateway will allow you access to above mentioned features plus remote locking/unlocking as well as seeing the lock status and receiving real-time notifications through the Reagle app.
Please see the feature difference in the table here.
*Available soon