MacRumors reports that Apple has launched a new sale in the App Store, the “Get Productive” sale, which features 19 popular productivity apps all with reduced prices (some as much as 50% off) in the iOS store, with 20 apps in total discounted in the Mac App Store.
As far as the iOS App Store is concerned, the discounted apps include Fantastical 2, Workflow, Clear, Duet Display, Calendars 5, and Daily Routine.
In the Mac App Store, some of the discounted apps on offer have seen their prices reduced by as much as 75% off list price, and include the likes of Day One, Byword, iA Writer Pro, iTranslate, mSecure, iStudiez Pro, Notability, to name but a few.
There is no official word as to when this promotion will be finishing, but just to be on the safe side you should download any of the apps that appeal to you as soon as possible to avoid missing out on the discounts.
Source: http://www.macrumors.com/2015/01/29/apple-productivity-app-sale/