How renewals quietly double your demand

Say you sign 20 new subscribers a week and 90 % of them reorder every four weeks. In week one you ship 20 first orders. In week five you ship 20 first orders and 18 renewals. In week nine, 20 + 18 + 16. By week 20 you are shipping more than twice what you shipped in week one, with exactly the same marketing.

Why the spreadsheet misses it

A spreadsheet looks at last month's sales and projects them forward. But last month's sales already include some renewals and not others, and the mix changes every week. The only way to get it right is to model the three streams separately:

1. One time orders: flat, driven by traffic.
2. First orders from new subscribers: flat, driven by your new customer pace.
3. Renewals: compounding. Every cohort comes back at the reorder rate, every cycle.

Hylla splits your orders into those three streams when it reads the store. New subscribers and one time orders come from your pace over the last four weeks. Renewals come from the subscribers you already have, cycling at the reorder rate it measures from your own history (it assumes 90 % until twenty renewals have actually come due, then uses what it saw). Growth comes from a trend you set, or the one it fits to your sales.

Units leaving / week

128

+3.4×vs today

What if is the real feature

Because the streams are separate, you can ask Hylla what happens if the new customer pace doubles. The answer is rarely "order twice as much". It is usually "order a bit more now, and a lot more in eight weeks", because the new cohorts only start renewing a cycle later. That gap is where cash gets tied up or shelves go empty, depending on which way you guess.

The what if sits at the top of the dashboard: ×1.5, ×2, ×3 new customers, and every order by date on the page moves with it. Nothing is saved, so you can play with it on a Monday morning and put it back.

The date you need before the shelf tells you

Renewals are demand you have already earned but have not shipped yet. They are not in last month's numbers, but they are already decided. A growing subscription brand sees the stock out months before the shelf shows it, as long as something is counting the cohorts. We built Hylla so that something is not you, on a Sunday, in a spreadsheet.