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Build a customized mobile subscription business with RevenueCat. We do the heavy lifting of normalizing subscribers from any source and maintain a single source of truth for subscription status, so you can get back to building your app.

RevenueCat is a powerful, secure, reliable, and free to use in-app purchase server with global support. All you need to get started is an API key.

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Subscriber Attributes

Adding custom properties to users in RevenueCat

Subscriber attributes are useful for storing additional, structured information on a user. For example, you could store your user's email address and additional system identifiers directly in RevenueCat. Attributes will not be seen by your users unless you choose to explicitly show them yourself.

Setting Attributes

Subscriber attributes can be set through the Purchases SDK by passing a dictionary of strings to the setAttributes() method on the shared Purchases instance.

Purchases.shared.setAttributes(["age" : "24", 
                             "custom_group_id" : "abc123"])
Purchases.sharedInstance.setAttributes(mapOf("age" to "24", "custom_group_id" to "abc123"))


Since subscriber attributes are writable using a public key they should not be used for managing secure or sensitive information such as subscription status, coins, etc.


You can specify up to 50 attributes, with key names up to 40 characters long and values up to 500 characters long. Keys cannot start with $ unless it's for one of the reserved attributes below.

Attribute key checklist:
✅Key does not contain whitespace
✅Key does not start with "$" (unless for a reserved attribute)
✅Key is not more than 40 characters
✅Value is not more than 500 characters
✅No more than 50 custom attributes

Reserved attributes

Attribute keys beginning with $ are reserved for RevenueCat. The current list of reserved keys are below:

$emailEmail address for the user
$displayNameName that should be used to reference the user
$phoneNumberPhone number for the user
$apnsTokensApple push notification tokens for the user
$fcmTokensGoogle push notification tokens for the user

Reserved attributes can be written with special helper methods:

Purchases.shared.setEmail("[email protected]")
Purchases.shared.setDisplayName("John Appleseed")
Purchases.sharedInstance.setEmail("[email protected]")
Purchases.sharedInstance.setDisplayName("John Appleseed")

Setting push tokens

Push tokens can be used to engage with your users through Apple apns or Google cloud messaging. These can be saved in RevenueCat through system callbacks after the user accepts the push notification permissions in your app.

func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {

Deleting Attributes

Any attribute can be cleared by passing null or an empty string as the key value. Individual attributes can also be cleared for a specific user in their customer view.

Purchases.shared.setAttributes(["age" : ""])
Purchases.sharedInstance.setAttributes(mapOf("age" to ""))

Reading Attributes

You can access subscriber attributes through the REST API using a secret key, in webhooks, and through analytics integrations (Amplitude, Mixpanel, Segment). The customer view dashboard will also show a list of attributes for the individual user that you can edit.


Subscriber attributes are write-only from the Purchases SDK. Reading attributes should only be done server-side through the webhooks or REST API.

Next Steps

Updated 4 months ago

Subscriber Attributes

Adding custom properties to users in RevenueCat

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