Nassi-Shneiderman Editor

The Nassi-Shneiderman Editor lets you create and edit Nassi-Shneiderman diagrams (structograms) directly on your tablet or phone. The app is designed for computer science classes, university courses and self-study: it helps you plan, structure and document program flow.

Editing
- Drag blocks from the palette into the diagram and label them in place
- Statement, input, output, branch, case, for loop, while loop, do-while loop, function, block call and try-catch
- Nest blocks, move them with a long press, duplicate and wrap them
- A bar above the keyboard with symbols and the variables already used in the diagram
- Undo and redo

Program code
- Generate code from the diagram: Python, Java, C#, C++, C and PHP
- The code updates immediately with every change
- Copy, share or save the code

Library
- All diagrams are saved automatically
- Search, sort, rename and duplicate
- Five templates with examples of branches and loops

Exchange
- Export as PNG, SVG and JSON to share or save
- Import JSON files

More
- Light and dark mode, following the device setting
- Interface in English, German, French and Spanish
- The previous view can still be selected in the settings

All content is processed locally on the device. Data only leaves the device when you export or share it yourself.

Recent changes:
Bug fixes: Python code for count loops is now valid (range), and case statements use match/case. Input prompts in the code and the “Number guessing” and “Grades” templates now follow the app language.