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#ask-questions
Title
# ask-questions
b

brief-australia-32533

10/10/2022, 6:00 PM
Hi everyone! I'm new to GrowthBook. As I understand, any client (for example, an iOS app) downloads all information about features and checks all conditions for each feature to get its value. To do this, the client should have all user attributes for the conditions. Is it correct? If so, how to use GrowthBook if a client has only a userID?
f

fresh-football-47124

10/10/2022, 6:14 PM
that’s correct
if you only have the userID, it depends on what you want to do - the userID is enough for a/b testing
b

brief-australia-32533

10/11/2022, 6:17 AM
I want to conduct a/b testing, but the main feature is feature-toggling with segmentation by different user attributes. Percentage rollout is also needed. Shortly, I need all GrowthBook features)
f

fresh-football-47124

10/11/2022, 6:18 AM
percentage rollouts can also use that userID
but ya, currently the attributes have to be available to the SDK to use for feature targeting
b

brief-australia-32533

10/11/2022, 6:26 AM
Seems like we can make a backend service that calculates all values for feature-toggles and provides them to the app. Or is there a better way?
f

fresh-football-47124

10/11/2022, 6:32 AM
ya, that’s a good way
b

brief-australia-32533

10/11/2022, 6:32 AM
Cool, thank you!
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