STOQ vs REZ: which preorder and back-in-stock app is right for your store?
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STOQ vs REZ: full comparison
The differences that matter
Both apps handle preorders and restock alerts, and both support Shopify Markets. Here's where the choice comes down — including where REZ is the cheaper fit.
Reach customers by SMS and Klaviyo, not just email
REZ sends by email only. There's no native SMS, and it doesn't connect to Klaviyo, Omnisend, or Mailchimp — everything runs inside Shopify.
STOQ sends by email and native SMS, and triggers your Klaviyo flows directly (plus Omnisend and Mailchimp). A restock text lands in minutes, through the tools you already use.
STOQ collects the balance; REZ leaves it to you
REZ takes deposits, but you collect the remaining balance yourself, by hand, from the order in Shopify admin — its docs even warn that Shopify's bulk action won't charge the customer.
STOQ saves the card and charges the balance automatically on your date or when the order ships, and recovers a failed charge (retry or payment link) — no manual chasing.
Sell B2B and in person, not just online
REZ runs on your online store. There's no B2B preorder flow and no Shopify POS.
STOQ sells preorders B2B (on Shopify Plus) and on Shopify POS, right alongside your online store — plus a read-and-write API for custom setups.
Switching is simple
Switching to STOQ doesn't mean starting over. If you have signups in another app, bring them with you, and your customers keep getting restock alerts on time. Three steps:
