The Stackz System

The Stackz System

The Stackz Overall Concept

Stackz is a flashcard organizer software, running on Windows and iOS. The focus of Stackz lies in visualizing the student's knowledge state.

It uses the classic "Leitner box" system by moving cards progressively in box compartments which represent the proficiency state. This isolates the unknowns cards, which must be learned.

Stackz extends that concept by reprepresenting additional card characteristics using colors, e.g. the up-to-dateness of the card's assessment: the darker the card color, the older its last successful test. This isolates the known cards which should be re-tested in order to confirm the knowledge.

Other ColorModes and highlighting options are available for marking and selecting cards.


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Detecting and eliminating one's weak spots is immediate!

The Stackz system helps you optimize your learning efficiency, regardless whether you must keep up to the pace of an intensive course with 30 new words per day (intensive learning), or whether you spend 20 minutes per week on your 10'000 words  collection (proficiency retention).

Software and Devices

A Stackz document contains several lessons, each of which has a set of flashcards that are distributed in the five promotion levels and colored according to the current color mode. 

Stackz allows selecting any combination of stacks and performing the actions with the included cards.

  • Learn new words (unknown and intermediate levels):
    * Learn dialog on PC and iOS
    * Match dialog on PC
    * Download to watch and consider during daily activities

  • Assess knowledge (unknown and intermediate levels):
    * Test dialog on PC and iOS

  • Refresh outdated cards (dark cards in intermediate and mastered levels):
    * Test dialog on PC and iOS

Stackz on PC
Stackz on PC

The PC version offers the widest range of tools for learning new words, assessing the knowledge and refreshing old cards,  including dictionary integration, reading words aloud, and handwriting recognition.

Stackz on iOS and Apple Watch
Stackz on iOS

Learning and testing on the go is seamlessly supported with Stackz on iOS and Apple Watch, including reading words aloud.

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You always maintain control of your knowledge state!

The Stackz system does not take decisions for you, nor are actions performed automatically. It rather makes the current situation transparent and makes suggestions.