# Creating users via Whalesync

#### About creating users Whalesync supports syncing with memberships apps like Memberstack and Webflow Memberships. When syncing with these apps we allow you to create users. For example, you can add a new user in Airtable and have that create a new member in Memberstack (:tada:). #### "Write-once" fields

* The email field for membership apps like Memberstack is what's called a "write-once" field. * You can create new emails from both connected apps (e.g. Memberstack or Airtable) * But once an email has been created, it cannot be updated If you try to update a "write-once" field, you'll get an issue like this: *"Please set the email address back from to "* #### Record sync delay Write-once fields can normally cause issues if synced with an app like Airtable since Airtable saves every keystroke. The result can be sending a partial email to Memberstack (e.g. "john\@gmai".) To avoid this issue, we default to a record sync delay of 30 seconds for these types of tables. See the record sync delay page for more details: {% content-ref url="broken-reference" %} [Broken link](https://docs.whalesync.com/features/additional-features/broken-reference) {% endcontent-ref %}