How do you sell add-ons to subscribers on Shopify?

What problem does this play solve?

A subscription repeats the same order. Revenue per subscriber only grows when the order does, and most subscribers never get asked to add something at a moment that suits them. Yet a subscriber who likes your product is the easiest customer you have to sell a second one to.

Checkout upsells reach people before they know the product. noms+, who sell supplements for dogs and cats, found that checkout upsells weren’t reaching subscribers who were good candidates for a second product. The better moment comes later, before an order, once the subscription has proven itself.

What’s the play?

Five moves, in this order:

1. Wait until the first order has been used. On day one, an add-on feels opportunistic, because the customer hasn’t seen the core product work yet. After the first delivery, the same offer reads as a recommendation. For example, start mentioning add-ons in your emails before the 2nd or 3rd order.
2. Anchor add-ons in the subscription product. Suggest items that complete what subscribers already get: a complement, a refill, something that makes the core product work better. Keep it to a few, with a line on how to use them. A random store promo teaches subscribers to tune out.
3. Make the first try a one-time extra. A second subscription is a big commitment. One item in the next order is a small one. Subscribers who like it can keep it in their recurring order later.
4. Upgrade at milestones. Some upgrades belong to a point in the journey, such as the full size after a starter kit or a larger pack once the habit is set. Make the switch at a fixed order, so nobody has to remember it.
5. Measure add-on revenue. Check what add-ons bring in each month and which ones subscribers pick. Replace the ones nobody adds.

How do you build it in Zubs?

• Built in: in the customer portal, you pick products to recommend, and subscribers add them as one-time items to their next order without changing their subscription.
• In practice: noms+ shows a few curated add-ons for the next shipment. Subscribers who like one then add it to their recurring products in the portal. Read the noms+ story.
• With Klaviyo: the reminder event arrives before each order, on your reminder schedule. Your reminder email can point to this order’s add-ons while there is still time to change it.
• Built in: Sequential Flows replace a product at the order you choose, such as a starter kit for the full size or a small pack for a large one. Subscribers see the change on their upcoming order before it bills.
• Built in: the analytics dashboard shows how much one-time add-ons bring in.

What should you measure?

Compare a few months before and after you start:

• Add-on revenue: this should grow as more subscribers try one.
• Products subscribers order most: add-ons that show up here have turned into habits.
• Churn rate: an add-on push that drives cancellations costs more than it earns. It should stay flat.

If add-ons sell well but new subscribers still leave early, fix the first renewals first with the early-churn playbook.