Overview
Plan
A plan in Konstrukt is a separate workspace. While it is possible to build calculations that read data from another plan (if your tenant is in version 1.43+), configuration and data is not synced between the plans and changes in one plan does not affect other plans unless there are such calculations.
App
Apps are what the end-user sees. An app can consists of one or several pages where each page is a grid functionally similar to a pivot table. In an app, there might also be configurable combonents for adding data to Dimensions or Valuetypes.
Value Type
A Valuetype is similar to a fact table in a typical BI data model. It contains datapoints such as salary, sales quantity, sales price, etc. and is identified via a set of dimensions where each row in the Valuetype must have a dimension value for each of the dimensions in the value type (i.e. all dimension fields are required). Each Valuetype only has one value column with a specfied type (decimal value, string, date)
Dimension
A dimension contains "registry information" such as accounts, employees, periods, and products. The main use of dimensions are as identifiers/keys in Valuetypes. But they can also be used as sources in Calculations (for versions 1.43+).