# 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:
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