There is a refresh button on the "Contacts" on the top left corner that can be used to refresh the contacts if somebody from your contacts just joined Galarm. To save the data on user's phone, we apply some heuristics to not sync all the contacts all the time but only the ones that are new or have changed. This may lead to some delays in the contacts appearing as Galarm contacts on your phone. We have provided a refresh button on the contacts tab to allow users to force a full sync for those cases. You can also pull down to refresh the contacts.
Please see the attached screenshot for the refresh button.