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Free plan. Billed by Shopify when you upgrade.
Unlimited contacts on every plan, including Free. No per-contact fee, and no extra bill as the list grows.
Contacts
Sample dataUnlimited contacts on every plan, including Free. No per-contact fee, and no extra bill as the list grows.
Every signup with the popup or widget it came from.

New signups added with the tag “Castor signup”.

Marked as a subscriber only when the shopper ticked the box.

Apps that sync from Shopify pick those customers up on their next sync.

Download every contact whenever you want.

Orders next to signups
Each contact shows where it signed up. After you approve orders at install, Castor can mark the ones who bought.
Contacts
Sample dataPrivacy built in
Castor honors Shopify's privacy requests for customer data and deletion, and keeps consent with every signup.


As many as you want. Contacts are unlimited on every plan, including Free. Castor never charges per contact.
Yes, if you turn it on. Each new signup is added to your Shopify customers with the tag “Castor signup”. It is marked as an email subscriber only when the shopper ticked your form's consent box.
Yes. Once signups go into Shopify customers, Shopify Email can use them. Klaviyo and other apps pick them up on their next Shopify sync.
More answers in the FAQ.






Unlimited views and contacts on every plan. A/B tests start on Startup. Billed by Shopify when you upgrade.