There's a small ritual almost every online shopper knows: you reach the checkout page, spot the little 'Promo code' box, and pause.

Maybe you open a new tab to hunt around. Maybe you just type in a guess and hope for the best.

To find out whether those guesses ever work,HotDealsis a verified coupon platform where real users test promo codes so shoppers don't have to.The data team analysed 55,637 real, verified coupon codes collected across thousands of online stores.

The takeaway? Coupon codes are far less random than they seem.

A surprisingly small set of naming patterns accounts for a meaningful share of working discount codes online. So if you're staring at an empty promo box with nothing to lose, these are statistically the codes most likely to do something.

After analysing all 55,637 codes, three major patterns stood out.

Codes built aroundWELCOME— especially those aimed at first-time shoppers — were by far the most common pattern in the dataset.

Among them,WELCOME10appeared1,732 times, accounting for3.11% of every code analysed— more than twice as common as nearly any other individual code.

Taken together, the entire 'WELCOME' family sits in a category of its own.

The second major pattern centered aroundSAVE:

Source: International Business Times UK