We pulled anonymised data from 1,400 stores running waitlists. The pattern is consistent: shoppers who join a restock waitlist convert at 3–5× your site average, and they do it without a discount code.
A sold-out product page is usually treated as a dead end. The inventory is gone, the ad spend is spent, and the shopper leaves. But that shopper has done something most of your traffic never does: they picked a specific variant and confirmed intent. That intent does not expire when your stock does.
Across 1,400 stores and roughly 40,000 restock alerts sent in the first half of 2026, alert recipients purchased at 34–52% depending on channel. Site-wide conversion for the same stores averaged 1.9%. Even allowing for selection bias — these are motivated shoppers — the gap is too large to ignore.
In India, WhatsApp outperformed email by roughly four to one. In Australia and the US, email held up better but SMS won on speed for limited drops. The practical takeaway: let shoppers choose the channel, and default to the one your market actually reads.
“We stopped thinking of the waitlist as a courtesy and started treating it as a pre-order queue. Production planning changed within a month.”
Meera J., founder · Kalaa Studio, Jaipur
None of this requires new ad spend. It requires treating an out-of-stock page as the start of a conversation rather than the end of one.
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