The app lets people use Moonpig's service through their iPhone. It also gives them the ability to snap a picture on their phone and add it directly to a card, choose a delivery address from their address book, and check out if they have a pre-pay Moonpig account.
The company's expansion on to the mobile platform coincides with bricks- and-mortar card retailer to introduce an online card-personalisation service.
The rest of the top 15 apps have a familiar look, with re-entries for Amazon Mobile, Sky News and Sky Mobile TV. While recent app launches from Tesco and Domino's Pizza have fallen out of the chart, Argos has climbed two places to number 12.
The chart is powered by analytics app developed by with non-commercial branded apps removed.