Mental Abacus Expert is an Android app developed by Lindblå läs skrivutveckling. It falls under the category of Education & Reference and is available for free. The app is designed to help users develop their mental arithmetic skills using the abacus technique.

The app offers four different exercises that aim to improve mental arithmetic abilities and train concentration and working memory. The first exercise focuses on quick interpretation of abacus figures, helping users imagine and retain clear mental images. The second exercise aims to develop quick perception of numbers, requiring users to remember and transfer numerical forms to abacus form. The third exercise involves viewing or listening to numbers and performing calculations on an abacus, allowing users to practice addition, subtraction, and mixed arithmetic. The final exercise focuses on mentally imagining an abacus and performing calculations on it.

Mental Abacus Expert offers a choice between modern (4+1) or classic (5+2) abacus types. The app provides text and video instructions to guide users through the exercises. It also includes a built-in speech engine for auditory assistance. Users can choose between beginner mode and expert mode for the last two exercises. The app is suitable for Flash Anzan training.

Overall, Mental Abacus Expert is a valuable tool for developing mental arithmetic skills and improving concentration and working memory. With its range of exercises and helpful features, users can enhance their mental abacus technique and achieve fast and accurate mental arithmetic abilities.